freenetis-github/system/libraries/ORM_Versioned.php @ b79f77ca
| 8baed187 | Michal Kliment | <?php
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/**
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* Object Relational Mapping (ORM) "versioned" extension. Allows ORM objects to
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* be revisioned instead of updated.
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*
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* $Id$
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*
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* @package ORM
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* @author Kohana Team
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* @copyright (c) 2007-2008 Kohana Team
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* @license http://kohanaphp.com/license.html
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*/
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class ORM_Versioned extends ORM {
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protected $last_version = NULL;
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/**
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* Overload ORM::save() to support versioned data
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*
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* @chainable
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* @return ORM
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*/
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public function save()
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{
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$this->last_version = 1 + ($this->last_version === NULL ? $this->object['version'] : $this->last_version);
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$this->__set('version', $this->last_version);
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parent::save();
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if ($this->saved)
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{
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$data = array();
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foreach ($this->object as $key => $value)
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{
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if ($key === 'id')
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continue;
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$data[$key] = $value;
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}
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$data[$this->foreign_key()] = $this->id;
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$this->db->insert($this->table_name.'_versions', $data);
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}
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return $this;
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}
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/**
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* Loads previous version from current object
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*
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* @chainable
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* @return ORM
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*/
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public function previous()
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{
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if ( ! $this->loaded)
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return $this;
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$this->last_version = ($this->last_version === NULL) ? $this->object['version'] : $this->last_version;
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$version = $this->last_version - 1;
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$query = $this->db
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->where($this->foreign_key(), $this->object[$this->primary_key])
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->where('version', $version)
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->limit(1)
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->get($this->table_name.'_versions');
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if ($query->count())
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{
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$this->load_values($query->result(FALSE)->current());
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}
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return $this;
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}
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/**
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* Restores the object with data from stored version
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*
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* @param integer version number you want to restore
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* @return ORM
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*/
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public function restore($version)
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{
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if ( ! $this->loaded)
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return $this;
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$query = $this->db
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->where($this->foreign_key(), $this->object[$this->primary_key])
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->where('version', $version)
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->limit(1)
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->get($this->table_name.'_versions');
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if ($query->count())
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{
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$row = $query->result(FALSE)->current();
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foreach ($row as $key => $value)
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{
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if ($key === $this->primary_key OR $key === $this->foreign_key())
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{
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// Do not overwrite the primary key
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continue;
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}
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if ($key === 'version')
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{
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// Always use the current version
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$value = $this->version;
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}
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$this->__set($key, $value);
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}
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$this->save();
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}
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return $this;
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}
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/**
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* Overloads ORM::delete() to delete all versioned entries of current object
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* and the object itself
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*
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* @param integer id of the object you want to delete
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* @return ORM
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*/
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public function delete($id = NULL)
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{
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if ($id === NULL)
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{
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// Use the current object id
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$id = $this->object[$this->primary_key];
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}
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if ($status = parent::delete($id))
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{
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$this->db->where($this->foreign_key(), $id)->delete($this->table_name.'_versions');
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}
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return $status;
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}
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}
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