ENHANCEMENT: Extensions are now the main method of providing custom functionality, replacing subclassing DMSDocument

code/DMS.php

@@ -6,11 +6,6 @@ class DMS implements DMSInterface {
 	//How many documents to store in a single folder. The square of this number is the maximum number of documents.
 	//The number should be a multiple of 10
 	static $dmsFolderSize = 1000;
-	static $modelClass = 'DMSDocument';
-	
-	static function set_model_class($className){
-		self::$modelClass = $className;
-	}
 
 
 	/**
@@ -59,8 +54,7 @@ class DMS implements DMSInterface {
 		$filePath = self::transform_file_to_file_path($file);
 		
 		//create a new document and get its ID
-		$modelClass = self::$modelClass;
-		$doc = new $modelClass();
+		$doc = new DMSDocument();
 		$doc->write();
 		$doc->storeDocument($filePath);
 

code/DMSDocument.php

@@ -556,6 +556,9 @@ class DMSDocument extends DataObject implements DMSDocumentInterface {
 				$uploadField->addExtraClass('replace'),
 				$pagesGrid->addExtraClass('find-usage')
 		)->setName("ActionsPanel")->addExtraClass('dmsupload ss-uploadfield'));
+
+		$this->extend('updateCMSFields', $fields);
+
 		return $fields;
 	}
 

code/DMSSiteTreeExtension.php

@@ -22,8 +22,9 @@ class DMSSiteTreeExtension extends DataExtension {
 			new GridFieldDetailForm()
 			//GridFieldLevelup::create($folder->ID)->setLinkSpec('admin/assets/show/%d')
 		);
-		$modelClass = DMS::$modelClass;
-		$gridFieldConfig->getComponentByType('GridFieldDataColumns')->setDisplayFields($modelClass::$display_fields)
+
+		singleton('DMSDocument');
+		$gridFieldConfig->getComponentByType('GridFieldDataColumns')->setDisplayFields(Config::inst()->get('DMSDocument', 'display_fields'))
 			->setFieldCasting(array('LastChanged'=>"Date->Ago"))
  			->setFieldFormatting(array('FilenameWithoutID'=>'<a target=\'_blank\' class=\'file-url\' href=\'$DownloadLink\'>$FilenameWithoutID</a>'));