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                <?php  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                /**  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                 *@author nicolaas[at] sunnysideup.co.nz  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                 *@description: individual ForSale page. Usually, these are not viewed as they can be read completely from the parent (ForSale HOLDER) page.  | 
            
            
                                                                                                            
                                                                
            
                                    
            
            
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                 */  | 
            
            
                                                                        
                            
            
                                    
            
            
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                class ForSaleOnePage extends Page  | 
            
                            
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                { | 
            
            
                                                                        
                            
            
                                    
            
            
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                    public static $icon = "mysite/images/treeicons/ForSaleOnePage";  | 
            
            
                                                                        
                            
            
                                    
            
            
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                    public static $default_parent = 'ForSaleHolderPage';  | 
            
            
                                                                        
                            
            
                                    
            
            
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                    public static $allowed_children = "none";  | 
            
            
                                                                        
                            
            
                                    
            
            
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                    public static $db = array(  | 
            
            
                                                                        
                            
            
                                    
            
            
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                        "IntroText" => "Varchar(255)",  | 
            
            
                                                                        
                            
            
                                    
            
            
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                        "PriceDescription" => "Varchar(255)",  | 
            
            
                                                                        
                            
            
                                    
            
            
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                        "ContactDetails" => "HTMLText"  | 
            
            
                                                                        
                            
            
                                    
            
            
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                    );  | 
            
            
                                                                        
                            
            
                                    
            
            
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                    public static $has_one = array(  | 
            
            
                                                                        
                            
            
                                    
            
            
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                        "ProductImage" => "Image"  | 
            
            
                                                                        
                            
            
                                    
            
            
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                    );  | 
            
            
                                                                        
                            
            
                                    
            
            
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                    //static $has_many = array();  | 
            
                            
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                    public function getCMSFields()  | 
            
                            
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                    { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        $fields = parent::getCMSFields();  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        $fields->replaceField("Title", new TextField("Title", "Product Name")); | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        $fields->replaceField("MenuTitle", new TextField("MenuTitle", "Product Name - short version for menus")); | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        $fields->replaceField("Content", new HtmlEditorField("Content", "Product Description", $rows = 7, $cols = 7)); | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        $fields->addFieldToTab("Root.Content.ProductInfo", new TextField("IntroText", "Intro Text")); | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        $fields->addFieldToTab("Root.Content.ProductInfo", new TextField("PriceDescription", "Price Description")); | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        $fields->addFieldToTab("Root.Content.ProductInfo", new HtmlEditorField("ContactDetails", "Contact Details", $rows = 7, $cols = 7)); | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        $fields->addFieldToTab("Root.Content.ProductInfo", new ImageField("ProductImage", "Product Image")); | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        return $fields;  | 
            
            
                                                                                                            
                                                                
            
                                    
            
            
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                    }  | 
            
            
                                                                        
                            
            
                                    
            
            
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                }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                class ForSaleOnePage_Controller extends Page_Controller  | 
            
                            
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                { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    public function init()  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        parent::init();  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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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.