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                <?php  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                class GridFieldMergeAction implements GridField_ColumnProvider, GridField_ActionProvider  | 
            
                            
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                { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    /**  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     * Cache results of records queries. This is useful for blogs  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     * with a lot of tags or categories.  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     *  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     * @var array  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     *  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     * @example  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     *  array(1) { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     *      ["2d73dd8f18b8da3c8e5e75b6bee66d8d"]=> array(3) { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     *          [2]=> string(5) "tag2"  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     *          [1]=> string(6) "tag1"  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     *          [3]=> string(4) "tag3"  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     *      }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     *  }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     *  The array key in the first level is made up of an md5 hash of the sql query,  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     *  then the second level is made if up ID => tag name.  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     */  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    protected static $cached_results = array();  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    /**  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     * List of records to show in the MergeAction column.  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     *  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     * @var array|SS_List  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     */  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    protected $records;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    /**  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     * Type of parent DataObject (i.e BlogTag, BlogCategory).  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     *  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     * @var string  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     */  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    protected $parentType;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    /**  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     * Relationship method to reference parent (i.e BlogTags).  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     *  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     * @var string  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     */  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    protected $parentMethod;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    /**  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     * Relationship method to reference child (i.e BlogPosts).  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     *  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     * @var string  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     */  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    protected $childMethod;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    /**  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     * @param array|SS_List $records  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     * @param string $parentType  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     * @param string $parentMethod  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     * @param string $childMethod  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     */  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    public function __construct($records = array(), $parentType, $parentMethod, $childMethod)  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        $this->records = $records;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        $this->parentType = $parentType;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        $this->parentMethod = $parentMethod;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        $this->childMethod = $childMethod;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    /**  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     * {@inheritdoc} | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     */  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    public function augmentColumns($gridField, &$columns)  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        if (!in_array('MergeAction', $columns)) { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            $columns[] = 'MergeAction';  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        return $columns;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    /**  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     * {@inheritdoc} | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     */  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    public function getColumnsHandled($gridField)  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        return array('MergeAction'); | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    /**  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     * {@inheritdoc} | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     */  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    public function getColumnContent($gridField, $record, $columnName)  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        if ($columnName === 'MergeAction') { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            if(!$record->hasMethod($this->childMethod) || $record->{$this->childMethod}()->count() < 1) { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                                return '';  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            $children = $record->{$this->childMethod}(); | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            $cacheKey = md5($children->dataQuery()->sql());  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            if(isset(self::$cached_results[$cacheKey])) { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                                $data = self::$cached_results[$cacheKey];  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            } else { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                                $data = $this->records->map()->toArray();  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                                self::$cached_results[$cacheKey] = $data;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            // Unset the current record  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            if(isset($data[$record->ID])) { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                                unset($data[$record->ID]);  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            if(count($data) > 0) { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                                $dropdown = new DropdownField('Target', 'Target', $data); | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                                $dropdown->setAttribute('id', 'Target_'.$record->ID); | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                                $prefix = strtolower($this->parentMethod . '-' . $this->childMethod);  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                                $action = GridFieldFormAction::create(  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                                    $gridField,  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                                    'MergeAction' . $record->ID,  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                                    'Move',  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                                    'merge',  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                                    array(  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                                        'record' => $record->ID,  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                                        'target' => $prefix . '-target-record-' . $record->ID,  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                                    )  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                                );  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                                $action->setExtraAttributes(array(  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                                    'data-target' => $prefix . '-target-record-' . $record->ID  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                                ));  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                                return $dropdown->Field() . $action->Field() . '<a title="Move posts to" class="MergeActionReveal">move posts to</a>';  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        return null;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    137
                 | 
                                    
                                                     | 
                
                 | 
                    }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    138
                 | 
                                    
                                                     | 
                
                 | 
                 | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    139
                 | 
                                    
                                                     | 
                
                 | 
                    /**  | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    140
                 | 
                                    
                                                     | 
                
                 | 
                     * {@inheritdoc} | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    141
                 | 
                                    
                                                     | 
                
                 | 
                     */  | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    142
                 | 
                                    
                                                     | 
                
                 | 
                    public function getColumnAttributes($gridField, $record, $columnName)  | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    143
                 | 
                                    
                                                     | 
                
                 | 
                    { | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    144
                 | 
                                    
                                                     | 
                
                 | 
                        return array('class' => 'MergeAction'); | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    145
                 | 
                                    
                                                     | 
                
                 | 
                    }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    146
                 | 
                                    
                                                     | 
                
                 | 
                 | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    147
                 | 
                                    
                                                     | 
                
                 | 
                    /**  | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    148
                 | 
                                    
                                                     | 
                
                 | 
                     * {@inheritdoc} | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    149
                 | 
                                    
                                                     | 
                
                 | 
                     */  | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    150
                 | 
                                    
                                                     | 
                
                 | 
                    public function getColumnMetadata($gridField, $columnName)  | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    151
                 | 
                                    
                                                     | 
                
                 | 
                    { | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    152
                 | 
                                    
                                                     | 
                
                 | 
                        return array('title' => 'Move posts to'); | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    153
                 | 
                                    
                                                     | 
                
                 | 
                    }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    154
                 | 
                                    
                                                     | 
                
                 | 
                 | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    155
                 | 
                                    
                                                     | 
                
                 | 
                    /**  | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    156
                 | 
                                    
                                                     | 
                
                 | 
                     * {@inheritdoc} | 
            
            
                                                                                                            
                                                                
            
                                    
            
            
                | 
                    157
                 | 
                                    
                                                     | 
                
                 | 
                     */  | 
            
            
                                                                        
                            
            
                                    
            
            
                | 
                    158
                 | 
                                    
                                                     | 
                
                 | 
                    public function getActions($gridField)  | 
            
            
                                                                        
                            
            
                                    
            
            
                | 
                    159
                 | 
                                    
                                                     | 
                
                 | 
                    { | 
            
            
                                                                        
                            
            
                                    
            
            
                | 
                    160
                 | 
                                    
                                                     | 
                
                 | 
                        return array('merge'); | 
            
            
                                                                        
                            
            
                                    
            
            
                | 
                    161
                 | 
                                    
                                                     | 
                
                 | 
                    }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    162
                 | 
                                    
                                                     | 
                
                 | 
                 | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    163
                 | 
                                    
                                                     | 
                
                 | 
                    /**  | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    164
                 | 
                                    
                                                     | 
                
                 | 
                     * {@inheritdoc} | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    165
                 | 
                                    
                                                     | 
                
                 | 
                     */  | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    166
                 | 
                                    
                                                     | 
                
                 | 
                    public function handleAction(GridField $gridField, $actionName, $arguments, $data)  | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    167
                 | 
                                    
                                                     | 
                
                 | 
                    { | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    168
                 | 
                                    
                                                     | 
                
                 | 
                        if ($actionName === 'merge') { | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    169
                 | 
                                    
                                                     | 
                
                 | 
                            $controller = Controller::curr();  | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    170
                 | 
                                    
                                                     | 
                
                 | 
                 | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    171
                 | 
                                    
                                                     | 
                
                 | 
                            $request = $controller->getRequest();  | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    172
                 | 
                                    
                                                     | 
                
                 | 
                 | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    173
                 | 
                                    
                                                     | 
                
                 | 
                            $target = $request->requestVar($arguments["target"]);  | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    174
                 | 
                                    
                                                     | 
                
                 | 
                 | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    175
                 | 
                                    
                                                     | 
                
                 | 
                            $parentType = $this->parentType;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    176
                 | 
                                    
                                                     | 
                
                 | 
                 | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    177
                 | 
                                    
                                                     | 
                
                 | 
                            $fromParent = $parentType::get()->byId($arguments['record']);  | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    178
                 | 
                                    
                                                     | 
                
                 | 
                            $toParent = $parentType::get()->byId($target);  | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    179
                 | 
                                    
                                                     | 
                
                 | 
                 | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    180
                 | 
                                    
                                                     | 
                
                 | 
                            $posts = $fromParent->{$this->childMethod}(); | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    181
                 | 
                                    
                                                     | 
                
                 | 
                 | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    182
                 | 
                                    
                                                     | 
                
                 | 
                            foreach ($posts as $post) { | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    183
                 | 
                                    
                                                     | 
                
                 | 
                                $relationship = $post->{$this->parentMethod}(); | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    184
                 | 
                                    
                                                     | 
                
                 | 
                 | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    185
                 | 
                                    
                                                     | 
                
                 | 
                                $relationship->remove($fromParent);  | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    186
                 | 
                                    
                                                     | 
                
                 | 
                                $relationship->add($toParent);  | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    187
                 | 
                                    
                                                     | 
                
                 | 
                            }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    188
                 | 
                                    
                                                     | 
                
                 | 
                        }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    189
                 | 
                                    
                                                     | 
                
                 | 
                    }  | 
            
            
                                                                                                            
                                                                
            
                                    
            
            
                | 
                    190
                 | 
                                    
                                                     | 
                
                 | 
                }  | 
            
            
                                                        
            
                                    
            
            
                | 
                    191
                 | 
                                    
                                                     | 
                
                 | 
                 | 
            
            
                        
You can fix this by adding a namespace to your class:
When choosing a vendor namespace, try to pick something that is not too generic to avoid conflicts with other libraries.