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                <?php  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                class DMSDocumentAdmin extends ModelAdmin  | 
            
                            
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                { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    private static $managed_models = array(  | 
            
                            
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                        'DMSDocument',  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        'DMSDocumentSet'  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    );  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    private static $url_segment = 'documents';  | 
            
                            
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                    private static $menu_title = 'Documents';  | 
            
                            
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                    private static $menu_icon = 'dms/images/app_icons/drawer.png';  | 
            
                            
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                    public function init()  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        parent::init();  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        Requirements::javascript(DMS_DIR . '/javascript/DMSGridField.js');  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    /**  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     * Remove the default "add" button and replace it with a customised version for DMS  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     *  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     * @return CMSForm  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     */  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    public function getEditForm($id = null, $fields = null)  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        /** @var CMSForm $form */  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        $form = parent::getEditForm($id, $fields);  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        $gridField = $form->Fields()->fieldByName($this->sanitiseClassName($this->modelClass));  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        return $this->modifyGridField($form, $gridField);  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    /**  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     * If the GridField is for DMSDocument then add a custom "add" button. If it's for DMSDocumentSet then  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     * update the display fields to include some extra columns that are only for this ModelAdmin, so cannot  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     * be added directly to the model's display fields.  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     *  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     * @param  CMSForm   $form  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     * @param  GridField $gridField  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     * @return CMSForm  | 
            
            
                                                                                                            
                                                                
            
                                    
            
            
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                     */  | 
            
            
                                                        
            
                                    
            
            
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                    protected function modifyGridField(CMSForm $form, GridField $gridField)  | 
            
            
                                                        
            
                                    
            
            
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                        $gridFieldConfig = $gridField->getConfig();  | 
            
            
                                                        
            
                                    
            
            
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                        if ($this->modelClass === 'DMSDocument') { | 
            
            
                                                        
            
                                    
            
            
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                            $gridFieldConfig->removeComponentsByType('GridFieldAddNewButton'); | 
            
            
                                                        
            
                                    
            
            
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                            $gridFieldConfig->addComponent(  | 
            
            
                                                        
            
                                    
            
            
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                                new DMSGridFieldAddNewButton('buttons-before-left'), | 
            
            
                                                        
            
                                    
            
            
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                                'GridFieldExportButton'  | 
            
            
                                                        
            
                                    
            
            
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                            );  | 
            
            
                                                        
            
                                    
            
            
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                        } elseif ($this->modelClass === 'DMSDocumentSet') { | 
            
            
                                                        
            
                                    
            
            
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                            $dataColumns = $gridFieldConfig->getComponentByType('GridFieldDataColumns'); | 
            
            
                                                        
            
                                    
            
            
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                            $fields = $dataColumns->getDisplayFields($gridField);  | 
            
            
                                                        
            
                                    
            
            
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                            $fields = array('Title' => 'Title', 'Page.Title' => 'Page') + $fields; | 
            
            
                                                        
            
                                    
            
            
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                            $dataColumns->setDisplayFields($fields)  | 
            
            
                                                        
            
                                    
            
            
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                                ->setFieldFormatting(  | 
            
            
                                                        
            
                                    
            
            
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                                    array(  | 
            
            
                                                        
            
                                    
            
            
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                                        'Page.Title' => function ($value, $item) { | 
            
            
                                                        
            
                                    
            
            
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                                            // Link a page click directly to the Document Set on the actual page  | 
            
            
                                                        
            
                                    
            
            
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                                            if ($page = SiteTree::get()->byID($item->PageID)) { | 
            
            
                                                        
            
                                    
            
            
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                                                return sprintf(  | 
            
            
                                                        
            
                                    
            
            
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                                                    "<a class='dms-doc-sets-link' href='%s/#Root_DocumentSets%s'>$value</a>",  | 
            
            
                                                        
            
                                    
            
            
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                                                    $page->CMSEditLink(),  | 
            
            
                                                        
            
                                    
            
            
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                                                    $page->DocumentSets()->count()  | 
            
            
                                                        
            
                                    
            
            
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                                                );  | 
            
            
                                                        
            
                                    
            
            
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                                            }  | 
            
            
                                                        
            
                                    
            
            
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                                        }  | 
            
            
                                                        
            
                                    
            
            
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                                    )  | 
            
            
                                                        
            
                                    
            
            
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                                );  | 
            
            
                                                        
            
                                    
            
            
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                        }  | 
            
            
                                                        
            
                                    
            
            
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                        return $form;  | 
            
            
                                                        
            
                                    
            
            
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                    }  | 
            
            
                                                        
            
                                    
            
            
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                }  | 
            
            
                                                        
            
                                    
            
            
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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.