revision.php - alkemann - Project Hosting on Google Code

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r252

Source path: svn/ trunk/ models/ behaviors/ revision.php

<?php
/**
 * Revision Behavior 2.0.4
 * 
 * Revision is a solution for adding undo and other versioning functionality
 * to your database models. It is set up to be easy to apply to your project,
 * to be easy to use and not get in the way of your other model activity.
 * It is also intended to work well with it's sibling, LogableBehavior.
 * 
 * Feature list :
 * 
 *  - Easy to install
 *  - Automagically save revision on model save
 *  - Able to ignore model saves which only contain certain fields
 *  - Limit number of revisions to keep, will delete oldest
 *  - Undo functionality (or update to any revision directly)
 *  - Revert to a datetime (and even do so cascading)
 *  - Get a diff model array to compare two or more revisions
 *  - Inspect any or all revisions of a model
 *  - Work with Tree Behavior
 *  - Includes beforeUndelete and afterUndelete callbacks
 *  - NEW As of 1.2 behavior will revision HABTM relationships (from one way)
 *
 * Install instructions :
 * 
 *  - Place the newest version of RevisionBehavior in your app/models/behaviors folder
 *  - Add the behavior to AppModel (or single models if you prefer)
 *  - Create a shadow table for each model that you want revision for.
 *  - Behavior will gracefully do nothing for models that has behavior, without table
 *  - If adding to an existing project, run the initializeRevisions() method once for each model.
 * 
 * About shadow tables :
 * 
 * You should make these AFTER you have baked your ordinary tables as they may interfer. By default
 * the tables should be named "[prefix][model_table_name]_revs" If you wish to change the suffix you may
 * do so in the property called $revision_suffix found bellow. Also by default the behavior expects
 * the revision tables to be in the same dbconfig as the model, but you may change this on a per 
 * model basis with the useDbConfig config option.
 * 
 * Add the same fields as in the live table, with 3 important differences. 
 *  - The 'id' field should NOT be the primary key, nor auto increment
 *  - Add the fields 'version_id' (int, primary key, autoincrement) and 
 *    'version_created' (datetime)
 *  - Skipp fields that should not be saved in shadowtable (lft,right,weight for instance)
 * 
 * Configuration :
 * 
 *  - 'limit' : number of revisions to keep, must be at least 2 
 *  - 'ignore' : array containing the name of fields to ignore
 *  - 'auto' : boolean when false the behavior will NOT generate revisions in afterSave
 *  - 'useDbConfig' : string/null Name of dbConfig to use. Null to use Model's
 * 
 * Limit functionality : 
 * The shadow table will save a revision copy when it saves live data, so the newest
 * row in the shadow table will (in most cases) be the same as the current live data.
 * The exception is when the ignore field functionality is used and the live data is 
 * updated only in those fields. 
 * 
 * Ignore field(s) functionality :
 * If you wish to be able to update certain fields without generating new revisions,
 * you can add those fields to the configuration ignore array. Any time the behavior's 
 * afterSave is called with just primary key and these fields, it will NOT generate
 * a new revision. It WILL however save these fields together with other fields when it
 * does save a revision. You will probably want to set up cron or otherwise call
 * createRevision() to update these fields at some points.
 * 
 * Auto functionality :
 * By default the behavior will insert itself into the Model's save process by implementing
 * beforeSave and afterSave. In afterSave, the behavior will save a new revision of the dataset
 * that is now the live data. If you do NOT want this automatic behavior, you may set the config
 * option 'auto' to false. Then the shadow table will remain empty unless you call createRevisions
 * manually.
 * 
 * HABTM revision feature :
 * In order to do revision on HABTM relationship, add a text field to the main model's shadow table
 * with the same name as the association, ie if Article habtm ArticleTag as Tag, add a field 'Tag' 
 * to articles_revs.
 * NB! In version 1.2 and up to current, Using HABTM revision requires that both models uses this
 * behavior (even if secondary model does not have a shadow table).
 * 
 * 1.1.1 => 1.1.2 changelog
 *   - revisions() got new paramter: $include_current
 *     This now defaults to false, resulting in a change from 1.1.1. See tests
 *
 * 1.1.6 => 1.2 
 *   - includes HABTM revision control (one way)
 *
 * 1.2 => 1.2.1
 *   - api change in revertToDate, added paramter for force delete if reverting to before earliest
 * 
 * 1.2.6 => 1.2.7
 * 	 - api change: removed shadow(), changed revertToDate() to only recurse into related models that
 *     are dependent when cascade is true
 * 
 * @author Ronny Vindenes
 * @author Alexander 'alkemann' Morland
 * @license MIT
 * @modifed 27. march 2009
 * @version 2.0.4
 */
class RevisionBehavior extends ModelBehavior {

	/**
	 * Behavior settings
	 * 
	 * @access public
	 * @var array
	 */
	public $settings = array();
	/**
	 * Shadow table prefix
	 * Only change this value if it causes table name crashes
	 *
	 * @access private
	 * @var string
	 */
	private $revision_suffix = '_revs';
	/**
	 * Defaul setting values
	 *
	 * @access private
	 * @var array
	 */
    private $defaults = array(
    	'limit' => false,
    	'auto' => true,
    	'ignore' => array(),
    	'useDbConfig' => null,
    	'model' => null
    );    
    /**
     * Old data, used to detect changes
     *
     * @var array
     */
    private $oldData = array();

    /**
     * Configure the behavior through the Model::actsAs property
     *
     * @param object $Model
     * @param array $config
     */
	public function setup(&$Model, $config = null) {	
		if (is_array($config)) {
			$this->settings[$Model->alias] = array_merge($this->defaults, $config);			
		} else {
			$this->settings[$Model->alias] = $this->defaults;
		}		
		$this->createShadowModel($Model);	
		$Model->Behaviors->attach('Containable');
	}

	/**
	 * Manually create a revision of the current record of Model->id
	 *
	 * @example $this->Post->id = 5; $this->Post->createRevision();
	 * @param object $Model
	 * @return boolean success
	 */
	public function createRevision(&$Model) {	
		if (! $Model->id) {
			trigger_error('RevisionBehavior: Model::id must be set', E_USER_WARNING); return null;
		}
		if (!$Model->ShadowModel) {
			trigger_error('RevisionBehavior: ShadowModel doesnt exist.', E_USER_WARNING); 
            return false;
		}   
		$habtm = array();
		$all_habtm = $Model->getAssociated('hasAndBelongsToMany');
		foreach ($all_habtm as $assocAlias) {
			if (isset($Model->ShadowModel->_schema[$assocAlias])) {	
				$habtm[] = $assocAlias;	
			}
		}
		$data = $Model->find('first', array(
			'conditions'=>array($Model->alias.'.'.$Model->primaryKey => $Model->id), 
			'contain' => $habtm
		));
		$Model->ShadowModel->create($data);
		$Model->ShadowModel->set('version_created', date('Y-m-d H:i:s'));
		foreach ($habtm as $assocAlias) {
			$foreign_keys = Set::extract($data,'/'.$assocAlias.'/'.$Model->{$assocAlias}->primaryKey);			
			$Model->ShadowModel->set($assocAlias, implode(',',$foreign_keys));
		}
		return $Model->ShadowModel->save();
	}
	
	/**
	 * Returns an array that maps to the Model, only with multiple values for fields that has been changed
	 *
	 * @example $this->Post->id = 4; $changes = $this->Post->diff();
	 * @example $this->Post->id = 4; $my_changes = $this->Post->diff(null,nul,array('conditions'=>array('user_id'=>4)));
	 * @example $this->Post->id = 4; $difference = $this->Post->diff(45,192);
	 * @param Object $Model
	 * @param int $from_version_id
	 * @param int $to_version_id
	 * @param array $options
	 * @return array
	 */
	public function diff(&$Model, $from_version_id = null, $to_version_id = null, $options = array()) {
		if (! $Model->id) {
			trigger_error('RevisionBehavior: Model::id must be set', E_USER_WARNING); return null;
		}
		if (!$Model->ShadowModel) {
			trigger_error('RevisionBehavior: ShadowModel doesnt exist.', E_USER_WARNING); 
            return null;
		}   
		if (isset($options['conditions'])) {
			$conditions = am($options['conditions'],array($Model->primaryKey => $Model->id));	
		} else {
			$conditions = array( $Model->primaryKey => $Model->id);	
		}	
		if (is_numeric($from_version_id) || is_numeric($to_version_id)) {
			if (is_numeric($from_version_id) && is_numeric($to_version_id)) {
				$conditions['version_id'] = array($from_version_id,$to_version_id);
				if ($Model->ShadowModel->find('count',array('conditions'=>$conditions)) < 2) {
					return false;
				}
			} else {
				if (is_numeric($from_version_id)) {
					$conditions['version_id'] = $from_version_id;					
				} else {
					$conditions['version_id'] = $to_version_id;
				}
				if ($Model->ShadowModel->find('count',array('conditions'=>$conditions)) < 1) {
					return false;
				}
			}			
		}
		$conditions = array($Model->primaryKey 	=> $Model->id);		
		if (is_numeric($from_version_id)) {
			$conditions['version_id >='] = $from_version_id;			
		}
		if (is_numeric($to_version_id)) {
			$conditions['version_id <='] = $to_version_id;		
		}
		$options['conditions'] = $conditions;
		$all = $this->revisions($Model,$options,true);
		if (sizeof($all) == 0) {
			return null;
		}
		$unified = array();
		$keys = array_keys($all[0][$Model->alias]);
		foreach ($keys as $field) {
			$all_values = Set::extract($all,'/'.$Model->alias.'/'.$field);
			$all_values = array_reverse(array_unique(array_reverse($all_values,true)),true);
			if (sizeof($all_values) == 1) {
				$unified[$field] = reset($all_values);
			} else {
				$unified[$field] = $all_values;
			}			
		}		 
		return array($Model->alias => $unified);
	}


	/**
	 * Will create a current revision of all rows in Model, if none exist.
	 * Use this if you add the revision to a model that allready has data in
	 * the DB.
	 * If you have large tables or big/many fields, use $limit to reduce the 
	 * number of rows that is run at once.
	 *
	 * @example $this->Post->initializeRevisions();
	 * @param object $Model
	 * @param int $limit number of rows to initialize in one go
	 * @return boolean 
	 */
	public function initializeRevisions(&$Model, $limit = 100) {
		if (!$Model->ShadowModel) {
			trigger_error('RevisionBehavior: ShadowModel doesnt exist.', E_USER_WARNING); 
            return false;
		}   
		if ($Model->ShadowModel->useTable == false) {
			trigger_error('RevisionBehavior: Missing shadowtable : '.$Model->table.$this->suffix, E_USER_WARNING); 
			return null;
		}
		if ($Model->ShadowModel->find('count') != 0) {
			return false;
		}
		$count = $Model->find('count');
		if ($limit < $count) {
			$remaining = $count;
			for ($p = 1; true; $p++ ) {
				
				$this->init($Model, $p, $limit);
				
				$remaining = $remaining - $limit;
				if ($remaining <= 0) {
					break;
				}
			}
		} else {
			$this->init($Model, 1, $count);
		}
		return true;
	}
	
	/**
	 * saves revisions for rows matching page and limit given
	 *
	 * @param object $Model
	 * @param int $page
	 * @param int $limit
	 */
	private function init(&$Model, $page, $limit) {
		$habtm = array();
		$all_habtm = $Model->getAssociated('hasAndBelongsToMany');
		foreach ($all_habtm as $assocAlias) {
			if (isset($Model->ShadowModel->_schema[$assocAlias])) {	
				$habtm[] = $assocAlias;	
			}
		}
		$all = $Model->find('all', array(
			'limit' => $limit, 
			'page' => $page, 
			'contain' => $habtm
		));
		$version_created = date('Y-m-d H:i:s');
		foreach ($all as $data) {
			$Model->ShadowModel->create($data);
			$Model->ShadowModel->set('version_created', $version_created);
			$Model->ShadowModel->save();
		}		
	}

	/**
	 * Finds the newest revision, including the current one.
	 * Use with caution, the live model may be different depending on the usage
	 * of ignore fields.
	 *
	 * @example $this->Post->id = 6; $newest_revision = $this->Post->newest();
	 * @param object $Model
	 * @param array $options
	 * @return array
	 */
	public function newest(&$Model, $options = array()) {
		if (! $Model->id) {
			trigger_error('RevisionBehavior: Model::id must be set', E_USER_WARNING); return null;
		}
		if (!$Model->ShadowModel) {
			trigger_error('RevisionBehavior: ShadowModel doesnt exist.', E_USER_WARNING); 
            return null;
		}   
		if (isset($options['conditions'])) {
			$options['conditions'] = am($options['conditions'],array($Model->alias.'.'.$Model->primaryKey => $Model->id));	
		} else {
			$options['conditions'] = array( $Model->alias.'.'.$Model->primaryKey => $Model->id);	
		}			
	
		return $Model->ShadowModel->find('first',$options);
	}

	/**
	 * Find the oldest revision for the current Model->id
	 * If no limit is used on revision and revision has been enabled for the model
	 * since start, this call will return the original first record.
	 *
	 * @example $this->Post->id = 2; $original = $this->Post->oldest();
	 * @param object $Model
	 * @param array $options
	 * @return array
	 */
	public function oldest(&$Model, $options = array()) {
		if (! $Model->id) {
			trigger_error('RevisionBehavior: Model::id must be set', E_USER_WARNING); return null;
		}
		if (!$Model->ShadowModel) {
			trigger_error('RevisionBehavior: ShadowModel doesnt exist.', E_USER_WARNING); 
            return null;
		}   
		if (isset($options['conditions'])) {
			$options['conditions'] = am($options['conditions'],array($Model->primaryKey => $Model->id));	
		} else {
			$options['conditions'] = array( $Model->primaryKey => $Model->id);	
		}			
		$options['order'] = 'version_created ASC, version_id ASC';
		return $Model->ShadowModel->find('first',$options);
	}

	/**
	 * Find the second newest revisions, including the current one.
	 *
	 * @example $this->Post->id = 6; $undo_revision = $this->Post->previous();
	 * @param object $Model
	 * @param array $options
	 * @return array
	 */
	public function previous(&$Model, $options = array()) {
		if (! $Model->id) {
			trigger_error('RevisionBehavior: Model::id must be set', E_USER_WARNING); return null;
		}
		if (!$Model->ShadowModel) {
			trigger_error('RevisionBehavior: ShadowModel doesnt exist.', E_USER_WARNING); 
            return false;
		}   
		$options['limit'] = 1;
		$options['page'] = 2;		
		if (isset($options['conditions'])) {
			$options['conditions'] = am($options['conditions'],array($Model->primaryKey => $Model->id));	
		} else {
			$options['conditions'] = array( $Model->primaryKey => $Model->id);	
		}		
		$revisions = $Model->ShadowModel->find('all',$options);
		if (!$revisions) {
			return null;
		}
		return $revisions[0]; 
	}
	
	/**
	 * Revert all rows matching conditions to given date.
	 * Model rows outside condition or not edited will not be affected. Edits since date
	 * will be reverted and rows created since date deleted.
	 *
	 * @param object $Model
	 * @param array $options 'conditions','date'
	 * @return boolean success
	 */
	public function revertAll(&$Model, $options = array()) {
		if (!$Model->ShadowModel) {
			trigger_error('RevisionBehavior: ShadowModel doesnt exist.', E_USER_WARNING); 
            return false;
		}   
		if (empty($options) || !isset($options['date'])) {
			return FALSE;
		}
		if (!isset($options['conditions'])) {
			$options['conditions'] = array();
		}
		// leave model rows out side of condtions alone  		
		// leave model rows not edited since date alone  
		
		$all = $Model->find('all',array('conditions'=>$options['conditions'],'fields'=>$Model->primaryKey));
		$allIds = Set::extract($all,'/'.$Model->alias.'/'.$Model->primaryKey);		
		
		$cond = $options['conditions'];
		$cond['version_created <'] = $options['date'];
		$created_before_date = $Model->ShadowModel->find('all',array(
			'order' => $Model->primaryKey,
			'conditions' => $cond,
			'fields' => array('version_id',$Model->primaryKey)
		)); 
		$created_before_dateIds = Set::extract($created_before_date,'/'.$Model->alias.'/'.$Model->primaryKey);
			
		$deleteIds = array_diff($allIds,$created_before_dateIds);
		
		// delete all Model rows where there are only version_created later than date
		$Model->deleteAll(array($Model->alias.'.'.$Model->primaryKey => $deleteIds),false,true);
		
		unset($cond['version_created <']);
		$cond['version_created >='] = $options['date'];
		$created_after_date = $Model->ShadowModel->find('all',array(
			'order' => $Model->primaryKey,
			'conditions' => $cond,
			'fields' => array('version_id',$Model->primaryKey)
		)); 
		$created_after_dateIds = Set::extract($created_after_date,'/'.$Model->alias.'/'.$Model->primaryKey);
		$updateIds = array_diff($created_after_dateIds,$deleteIds);
		
		$revertSuccess = true;
		// update model rows that have version_created earlier than date to latest before date
		foreach ($updateIds as $mid) {
			$Model->id = $mid;
			if ( ! $Model->revertToDate($options['date']) ) {
				$revertSuccess = false; 
			}
		}
		return $revertSuccess;
	}
	
	/**
	 * Revert current Model->id to the given revision id
	 * Will return false if version id is invalid or save fails
	 *
	 * @example $this->Post->id = 3; $this->Post->revertTo(12); 
	 * @param object $Model
	 * @param int $version_id
	 * @return boolean
	 */
	public function revertTo(&$Model, $version_id) {
		if (! $Model->id) {
			trigger_error('RevisionBehavior: Model::id must be set', E_USER_WARNING); return null;
		}
		if (!$Model->ShadowModel) {
			trigger_error('RevisionBehavior: ShadowModel doesnt exist.', E_USER_WARNING); 
            return false;
		}   
		$data = $Model->ShadowModel->find('first',array('conditions'=>array('version_id'=>$version_id)));	
		if ($data == false) {
			return false;
		}
		foreach ($Model->getAssociated('hasAndBelongsToMany') as $assocAlias) {
			if (isset($Model->ShadowModel->_schema[$assocAlias])) {					
				$data[$assocAlias][$assocAlias] = explode(',',$data[$Model->alias][$assocAlias]);
			} 
		}	
		return $Model->save($data);
	}
	
	/**
	 * Revert to the oldest revision after the given datedate.
	 * Will cascade to hasOne and hasMany associeted models if $cascade is true.
	 * Will return false if no change is made on the main model 
	 *
	 * @example $this->Post->id = 3; $this->Post->revertToDate(date('Y-m-d H:i:s',strtotime('Yesterday')));
	 * @example $this->Post->id = 4; $this->Post->revertToDate('2008-09-01',true);
	 * @param object $Model
	 * @param string $datetime
	 * @param boolean $cascade
	 * @param boolean $force_delete
	 * @return boolean
	 */
	public function revertToDate(&$Model, $datetime, $cascade = false, $force_delete = false) {
		if (! $Model->id) {
			trigger_error('RevisionBehavior: Model::id must be set', E_USER_WARNING); 
			return null;
		}
		if ($cascade) {		
			$associated = array_merge($Model->hasMany, $Model->hasOne);
			foreach ($associated as $assoc => $data) {
				$ids = array();
				
				$cascade = false;
				/* Check if association has dependent children */
				$depassoc = array_merge($Model->$assoc->hasMany, $Model->$assoc->hasOne);
				foreach ($depassoc as $dep) {
					if ($dep['dependent']) {
						$cascade = true;
					}
				}
				
				/* Query live data for children */
				$children = $Model->$assoc->find('list', array('conditions'=>array($data['foreignKey']=>$Model->id),'recursive'=>-1));		
				if (!empty($children)) {
					$ids = array_keys($children);
				}
				
				/* Query shadow table for deleted children */
				$revision_children = $Model->$assoc->ShadowModel->find('all', array(
					'fields'=>array('DISTINCT '.$Model->primaryKey),
					'conditions'=>array(
						$data['foreignKey']=>$Model->id,
						'NOT' => array( $Model->primaryKey => $ids )
					),
				));				
				if (!empty($revision_children)) {
					$ids = am($ids,Set::extract($revision_children,'/'.$assoc.'/'.$Model->$assoc->primaryKey));
				}
				
				/* Revert all children */
				foreach ($ids as $id) {
					$Model->$assoc->id = $id;
					$Model->$assoc->revertToDate($datetime, $cascade, $force_delete);
				}
			}			
		} 		
		if (empty($Model->ShadowModel)) {
            return true;
		}   
		$data = $Model->ShadowModel->find('first',array(
			'conditions'=>array(
				$Model->primaryKey => $Model->id,
				'version_created <='=>$datetime
			),
			'order'=>'version_created ASC, version_id ASC'
		));
		/* If no previous version was found and revertToDate() was called with force_delete, then delete the live data, else leave it alone */
		if ($data == false) {
			if ($force_delete) {
				$Model->logableAction['Revision'] = 'revertToDate('.$datetime.') delete';
				return $Model->delete($Model->id);
			}
			return true;
		}
		$habtm = array();
		foreach ($Model->getAssociated('hasAndBelongsToMany') as $assocAlias) {
			if (isset($Model->ShadowModel->_schema[$assocAlias])) {							
				$habtm[] = $assocAlias;					
			} 
		}
		$liveData = $Model->find('first', array(
	       		'contain'=> $habtm,
	       		'conditions'=>array($Model->alias.'.'.$Model->primaryKey => $Model->id)));
		
		$Model->logableAction['Revision'] = 'revertToDate('.$datetime.') add';
		if ($liveData) {
			$Model->logableAction['Revision'] = 'revertToDate('.$datetime.') edit';
			foreach ($Model->getAssociated('hasAndBelongsToMany') as $assocAlias) {
				if (isset($Model->ShadowModel->_schema[$assocAlias])) {		
					$ids = Set::extract($liveData,'/'.$assocAlias.'/'.$Model->$assocAlias->primaryKey);	
					if (empty($ids) || is_string($ids)) {
						$liveData[$Model->alias][$assocAlias] = '';				
					} else {
						$liveData[$Model->alias][$assocAlias] = implode(',',$ids);
					}			
					$data[$assocAlias][$assocAlias] = explode(',',$data[$Model->alias][$assocAlias]);
				} 
				unset($liveData[$assocAlias]);
			}				
			
			$changeDetected = false;
			foreach ($liveData[$Model->alias] as $key => $value) {
	   			if ( isset($data[$Model->alias][$key])) {   						
	   				$old_value = $data[$Model->alias][$key];
	   			} else {
	   				$old_value = '';
	   			}
	   			if ($value != $old_value ) {
	   				$changeDetected = true;				
	   			}
	   		}
	
	   		if (!$changeDetected) {
	   			return true;
	   		}	
		}	
   		
		$auto = $this->settings[$Model->alias]['auto'];
		$this->settings[$Model->alias]['auto'] = false;
		$Model->ShadowModel->create($data,true);
		$Model->ShadowModel->set('version_created', date('Y-m-d H:i:s'));
		$Model->ShadowModel->save();
		$Model->version_id = $Model->ShadowModel->id;
		$success =  $Model->save($data);
		$this->settings[$Model->alias]['auto'] = $auto;		
		return $success;
	}


	/**
	 * Returns a comeplete list of revisions for the current Model->id. 
	 * The options array may include Model::find parameters to narrow down result
	 * Alias for shadow('all',array('conditions'=>array($Model->primaryKey => $Model->id)));
	 * 
	 * @example $this->Post->id = 4; $history = $this->Post->revisions(); 
	 * @example $this->Post->id = 4; $today = $this->Post->revisions(array('conditions'=>array('version_create >'=>'2008-12-10'))); 
	 * @param object $Model
	 * @param array $options
	 * @param boolean $include_current If true will include last saved (live) data
	 * @return array
	 */
	public function revisions(&$Model, $options = array(), $include_current = false) {
		if (! $Model->id) {
			trigger_error('RevisionBehavior: Model::id must be set', E_USER_WARNING); return null;
		}
		if (!$Model->ShadowModel) {
			trigger_error('RevisionBehavior: ShadowModel doesnt exist.', E_USER_WARNING); 
            return null;
		}   
		if (isset($options['conditions'])) {
			$options['conditions'] = am($options['conditions'],array($Model->alias.'.'.$Model->primaryKey => $Model->id));	
		} else {
			$options['conditions'] = array($Model->alias.'.'.$Model->primaryKey => $Model->id);	
		}	
		if ( $include_current == false ) {
            $current = $this->newest($Model, array('fields'=>array($Model->alias.'.version_id',$Model->primaryKey)));
            $options['conditions'][$Model->alias.'.version_id !='] = $current[$Model->alias]['version_id'];
		}	
		return $Model->ShadowModel->find('all',$options);
	}
	
	/**
	 * Undoes an delete by saving the last revision to the Model
	 * Will return false if this Model->id exist in the live table.
	 * Calls Model::beforeUndelete and Model::afterUndelete
	 *
	 * @example $this->Post->id = 7; $this->Post->undelete(); 
	 * @param object $Model
	 * @return boolean
	 */
	public function undelete(&$Model) {
		if (! $Model->id) {
			trigger_error('RevisionBehavior: Model::id must be set', E_USER_WARNING); return null;
		}
		if (!$Model->ShadowModel) {
			trigger_error('RevisionBehavior: ShadowModel doesnt exist.', E_USER_WARNING); 
            return false;
		}   
		if  ($Model->find('count',array(
			'conditions'=>array($Model->primaryKey=>$Model->id),
			'recursive'=>-1)) > 0) {
			return false;
		}
		$data = $this->newest($Model);
		if (!$data) {
			return false;
		}
		$beforeUndeleteSuccess = true;
		if (method_exists($Model,'beforeUndelete')) {
			$beforeUndeleteSuccess = $Model->beforeUndelete();
		}
		if (!$beforeUndeleteSuccess) {
			return false;
		}
		$model_id = $data[$Model->alias][$Model->primaryKey];
		unset($data[$Model->alias][$Model->ShadowModel->primaryKey]);
		$Model->create($data,true);
		$auto_setting = $this->settings[$Model->alias]['auto'];
		$this->settings[$Model->alias]['auto'] = false;
		$save_success =  $Model->save();
		$this->settings[$Model->alias]['auto'] = $auto_setting;
		if (!$save_success) {
			return false;
		}
		$Model->updateAll(
			array($Model->primaryKey => $model_id),
			array($Model->primaryKey => $Model->id)			
		);
		$Model->id = $model_id;
		$Model->createRevision();
		$afterUndeleteSuccess = true;
		if (method_exists($Model,'afterUndelete')) {
			$afterUndeleteSuccess = $Model->afterUndelete();
		}
		return $afterUndeleteSuccess;	
	}
	
	/**
	 * Update to previous revision
	 *
	 * @example $this->Post->id = 2; $this->Post->undo();
	 * @param object $Model
	 * @return boolean
	 */
	public function undo(&$Model) {	
		if (! $Model->id) {
			trigger_error('RevisionBehavior: Model::id must be set', E_USER_WARNING); return null;
		}
		if (!$Model->ShadowModel) {
			trigger_error('RevisionBehavior: ShadowModel doesnt exist.', E_USER_WARNING); 
            return false;
		}   
		$data = $this->previous($Model);
		if ($data == false) {
			$Model->logableAction['Revision'] = 'undo add';
			$Model->delete($Model->id);
			return false;
		}		
		foreach ($Model->getAssociated('hasAndBelongsToMany') as $assocAlias) {
			if (isset($Model->ShadowModel->_schema[$assocAlias])) {					
				$data[$assocAlias][$assocAlias] = explode(',',$data[$Model->alias][$assocAlias]);
			} 
		}	
		$Model->logableAction['Revision'] = 'undo changes';
		return $Model->save($data);
	}	
	
	/**
	 * Calls create revision for all rows matching primary key list of $idlist
	 *
	 * @example $this->Model->updateRevisions(array(1,2,3));
	 * @param object $Model
	 * @param array $idlist
	 */
	public function updateRevisions(&$Model, $idlist = array()) {
		if (!$Model->ShadowModel) {
			trigger_error('RevisionBehavior: ShadowModel doesnt exist.', E_USER_WARNING); 
            return null;
		}   
		foreach ($idlist as $id ) {
			$Model->id = $id;
			$Model->createRevision();
		}
	}
	
	/**
	 * Causes revision for habtm associated models if that model does version control
	 * on their relationship.  BeforeDelete identifies the related models that will need
	 * to do the revision update in afterDelete. Uses
	 *
	 * @param unknown_type $Model
	 */
	public function afterDelete(&$Model) {
		if ($this->settings[$Model->alias]['auto'] === false) {
			return true;
		}		
		if (!$Model->ShadowModel) {
            return true;
		}   
		if (isset($this->deleteUpdates[$Model->alias]) && !empty($this->deleteUpdates[$Model->alias])) {
			foreach ($this->deleteUpdates[$Model->alias] as $assocAlias => $assocIds) {
				$Model->{$assocAlias}->updateRevisions($assocIds);
			}
			unset($this->deleteUpdates[$Model->alias]);
		}		
	}
			
	/**
	 * Will create a new revision if changes have been made in the models non-ignore fields. 
	 * Also deletes oldest revision if limit is (active and) reached.
	 *
	 * @param object $Model
	 * @param boolean $created
	 * @return boolean
	 */
	public function afterSave(&$Model, $created) {
		if ($this->settings[$Model->alias]['auto'] === false) {
			return true;
		}		
		if (!$Model->ShadowModel) {
            return true;
		}   
		if ($created) {
			$Model->ShadowModel->create($Model->data,true);
			$Model->ShadowModel->set('id',$Model->id);
			$Model->ShadowModel->set('version_created',date('Y-m-d H:i:s'));
			foreach ($Model->data as $alias => $alias_data) {
				if (isset($Model->ShadowModel->_schema[$alias])) {
					if (isset($alias_data[$alias]) && !empty($alias_data[$alias])) {
						$Model->ShadowModel->set($alias,implode(',',$alias_data[$alias]));
					}
				}
			}
			$success = $Model->ShadowModel->save();		
			$Model->version_id = $Model->ShadowModel->id;
			return $success;	
		}  	
			
		$habtm = array();
		foreach ($Model->getAssociated('hasAndBelongsToMany') as $assocAlias) {
			if (isset($Model->ShadowModel->_schema[$assocAlias])) {					
				$habtm[] = $assocAlias;	
			} 
		}				
		$data = $Model->find('first', array(
	       		'contain'=> $habtm,
	       		'conditions'=>array($Model->alias.'.'.$Model->primaryKey => $Model->id)));

        $changeDetected = false;
		foreach ($data[$Model->alias] as $key => $value) {
   			if ( isset($data[$Model->alias][$Model->primaryKey]) 
   					&& !empty($this->oldData[$Model->alias]) 
   					&& isset($this->oldData[$Model->alias][$Model->alias][$key])) {
   						
   				$old_value = $this->oldData[$Model->alias][$Model->alias][$key];
   			} else {
   				$old_value = '';
   			}
   			if ($value != $old_value && !in_array($key,$this->settings[$Model->alias]['ignore'])) {
   				$changeDetected = true;				
   			}
   		}
   		$Model->ShadowModel->create($data);
   		if (!empty($habtm)) {
	   		foreach ($habtm as $assocAlias) {
	   			if (in_array($assocAlias,$this->settings[$Model->alias]['ignore'])) {
	   				continue;
	   			}				
	   			$oldIds = Set::extract($this->oldData[$Model->alias],$assocAlias.'.{n}.id');
          if (!isset($Model->data[$assocAlias])) {					
            $Model->ShadowModel->set($assocAlias, implode(',',$oldIds));
            continue;
          }
          $currentIds = Set::extract($data,$assocAlias.'.{n}.id');
          $id_changes = array_diff($currentIds,$oldIds);
          if (!empty($id_changes)) {
            $Model->ShadowModel->set($assocAlias, implode(',',$currentIds));
            $changeDetected = true;
          } else {
            $Model->ShadowModel->set($assocAlias, implode(',',$oldIds));
          }
	   		}   			
   		}
   		unset($this->oldData[$Model->alias]); 		
   		if (!$changeDetected) {
   			return true;
   		}
		$Model->ShadowModel->set('version_created', date('Y-m-d H:i:s'));
		$Model->ShadowModel->save();
		$Model->version_id = $Model->ShadowModel->id;
		if (is_numeric($this->settings[$Model->alias]['limit'])) {
            $conditions = array('conditions'=>array($Model->alias.'.'.$Model->primaryKey => $Model->id));
			$count = $Model->ShadowModel->find('count', $conditions);
			if ($count > $this->settings[$Model->alias]['limit']) {
                $conditions['order'] = $Model->alias.'.version_created ASC, '.$Model->alias.'.version_id ASC';
				$oldest = $Model->ShadowModel->find('first',$conditions);
				$Model->ShadowModel->id = null;
				$Model->ShadowModel->del($oldest[$Model->alias][$Model->ShadowModel->primaryKey]);	
			}			
		}
		return true;
	}
	
	/**
	 * Causes revision for habtm associated models if that model does version control
	 * on their relationship. BeforeDelete identifies the related models that will need
	 * to do the revision update in afterDelete.
	 *
	 * @param object $Model
	 * @return boolean
	 */
	public function beforeDelete(&$Model) {
		if ($this->settings[$Model->alias]['auto'] === false) {
			return true;
		}		
		if (!$Model->ShadowModel) {
            return true;
		}   
		foreach ($Model->hasAndBelongsToMany as $assocAlias => $a) {
			if (isset($Model->{$assocAlias}->ShadowModel->_schema[$Model->alias])) {										
				$joins =  $Model->{$a['with']}->find('all',array(
					'recursive' => -1,
					'conditions' => array(
						$a['foreignKey'] => $Model->id
					)
				));
				$this->deleteUpdates[$Model->alias][$assocAlias] = Set::extract($joins,'/'.$a['with'].'/'.$a['associationForeignKey']);
			} 
		}
		return true;
	}
		
	/**
	 * Revision uses the beforeSave callback to remember the old data for comparison in afterSave
	 *
	 * @param object $Model
	 * @return boolean
	 */
	public function beforeSave(&$Model) {
		if ($this->settings[$Model->alias]['auto'] === false) {
			return true;
		}
		if (!$Model->ShadowModel) {
            return true;
		}   
		$Model->ShadowModel->create();
		if (!isset($Model->data[$Model->alias][$Model->primaryKey]) && !$Model->id) {
			return true;
		}
		
		$habtm = array();
		foreach ($Model->getAssociated('hasAndBelongsToMany') as $assocAlias) {
			if (isset($Model->ShadowModel->_schema[$assocAlias])) {					
				$habtm[] = $assocAlias;	
			} 
		}		
		$this->oldData[$Model->alias] = $Model->find('first', array(
	       		'contain'=> $habtm,
	       		'conditions'=>array($Model->alias.'.'.$Model->primaryKey => $Model->id)));
		
        return true;
	}


	/**
	 * Returns a generic model that maps to the current $Model's shadow table.
	 *
	 * @param object $Model
	 * @return boolean
	 */
	private function createShadowModel(&$Model) {
		if (is_null($this->settings[$Model->alias]['useDbConfig'])) {
			$dbConfig = $Model->useDbConfig;
		} else {
			$dbConfig = $this->settings[$Model->alias]['useDbConfig'];			
		}
		$db = & ConnectionManager::getDataSource($dbConfig);
		if ($Model->useTable) {
		  $shadow_table = $Model->useTable;	
		} else {
		  $shadow_table = Inflector::tableize($Model->name);
		}
		$shadow_table = $shadow_table . $this->revision_suffix;
		$prefix = $Model->tablePrefix ? $Model->tablePrefix : $db->config['prefix'];
		$full_table_name = $prefix . $shadow_table;
	
		$existing_tables = $db->listSources();
		if (!in_array($full_table_name, $existing_tables)) {
            $Model->ShadowModel = false;
            return false;
		}  
    $useShadowModel = $this->settings[$Model->alias]['model'];
		if (is_string($useShadowModel) && App::import('model',$useShadowModel)) {
      $Model->ShadowModel = new $useShadowModel(false, $shadow_table, $dbConfig);
    } else {
      $Model->ShadowModel = new Model(false, $shadow_table, $dbConfig);
    }			
    if ($Model->tablePrefix) {
      $Model->ShadowModel->tablePrefix = $Model->tablePrefix;
    }
		$Model->ShadowModel->alias = $Model->alias;
		$Model->ShadowModel->primaryKey = 'version_id';
		$Model->ShadowModel->order = 'version_created DESC, version_id DESC';
		return true;
	}

}
?>

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Change log

r227 by alek.morland on Mar 27, 2009 Diff

refactored createShadowModel to fix  issue
#30  concerning prefix and suffix usage.

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Older revisions

r223 by ronny.vindenes on Mar 11, 2009 Diff

Handle revisions for models with
useTable = false

r219 by ronny.vindenes on Mar 06, 2009 Diff

Changed diff() to use consistent array
keys

r212 by alkemann on Feb 06, 2009 Diff

fix and tests that proved problem with
revertTo when unchanged habtm

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