thecodingmachine / database.tdbm

src/Mouf/Database/TDBM/AbstractTDBMObject.php

Indentation +595 added lines, -595 removed lines

@@ -31,604 +31,604 @@
  */
 abstract class AbstractTDBMObject implements JsonSerializable
 {
-    /**
-     * The service this object is bound to.
-     *
-     * @var TDBMService
-     */
-    protected $tdbmService;
-
-    /**
-     * An array of DbRow, indexed by table name.
-     *
-     * @var DbRow[]
-     */
-    protected $dbRows = array();
-
-    /**
-     * One of TDBMObjectStateEnum::STATE_NEW, TDBMObjectStateEnum::STATE_NOT_LOADED, TDBMObjectStateEnum::STATE_LOADED, TDBMObjectStateEnum::STATE_DELETED.
-     * $status = TDBMObjectStateEnum::STATE_NEW when a new object is created with DBMObject:getNewObject.
-     * $status = TDBMObjectStateEnum::STATE_NOT_LOADED when the object has been retrieved with getObject but when no data has been accessed in it yet.
-     * $status = TDBMObjectStateEnum::STATE_LOADED when the object is cached in memory.
-     *
-     * @var string
-     */
-    private $status;
-
-    /**
-     * Array storing beans related via many to many relationships (pivot tables).
-     *
-     * @var \SplObjectStorage[] Key: pivot table name, value: SplObjectStorage
-     */
-    private $relationships = [];
-
-    /**
-     * @var bool[] Key: pivot table name, value: whether a query was performed to load the data
-     */
-    private $loadedRelationships = [];
-
-    /**
-     * Array storing beans related via many to one relationships (this bean is pointed by external beans).
-     *
-     * @var AlterableResultIterator[] Key: [external_table]___[external_column], value: SplObjectStorage
-     */
-    private $manyToOneRelationships = [];
-
-    /**
-     * Used with $primaryKeys when we want to retrieve an existing object
-     * and $primaryKeys=[] if we want a new object.
-     *
-     * @param string      $tableName
-     * @param array       $primaryKeys
-     * @param TDBMService $tdbmService
-     *
-     * @throws TDBMException
-     * @throws TDBMInvalidOperationException
-     */
-    public function __construct($tableName = null, array $primaryKeys = array(), TDBMService $tdbmService = null)
-    {
-        // FIXME: lazy loading should be forbidden on tables with inheritance and dynamic type assignation...
-        if (!empty($tableName)) {
-            $this->dbRows[$tableName] = new DbRow($this, $tableName, $primaryKeys, $tdbmService);
-        }
-
-        if ($tdbmService === null) {
-            $this->_setStatus(TDBMObjectStateEnum::STATE_DETACHED);
-        } else {
-            $this->_attach($tdbmService);
-            if (!empty($primaryKeys)) {
-                $this->_setStatus(TDBMObjectStateEnum::STATE_NOT_LOADED);
-            } else {
-                $this->_setStatus(TDBMObjectStateEnum::STATE_NEW);
-            }
-        }
-    }
-
-    /**
-     * Alternative constructor called when data is fetched from database via a SELECT.
-     *
-     * @param array       $beanData    array<table, array<column, value>>
-     * @param TDBMService $tdbmService
-     */
-    public function _constructFromData(array $beanData, TDBMService $tdbmService)
-    {
-        $this->tdbmService = $tdbmService;
-
-        foreach ($beanData as $table => $columns) {
-            $this->dbRows[$table] = new DbRow($this, $table, $tdbmService->_getPrimaryKeysFromObjectData($table, $columns), $tdbmService, $columns);
-        }
-
-        $this->status = TDBMObjectStateEnum::STATE_LOADED;
-    }
-
-    /**
-     * Alternative constructor called when bean is lazily loaded.
-     *
-     * @param string      $tableName
-     * @param array       $primaryKeys
-     * @param TDBMService $tdbmService
-     */
-    public function _constructLazy($tableName, array $primaryKeys, TDBMService $tdbmService)
-    {
-        $this->tdbmService = $tdbmService;
-
-        $this->dbRows[$tableName] = new DbRow($this, $tableName, $primaryKeys, $tdbmService);
-
-        $this->status = TDBMObjectStateEnum::STATE_NOT_LOADED;
-    }
-
-    public function _attach(TDBMService $tdbmService)
-    {
-        if ($this->status !== TDBMObjectStateEnum::STATE_DETACHED) {
-            throw new TDBMInvalidOperationException('Cannot attach an object that is already attached to TDBM.');
-        }
-        $this->tdbmService = $tdbmService;
-
-        // If we attach this object, we must work to make sure the tables are in ascending order (from low level to top level)
-        $tableNames = $this->getUsedTables();
-
-        $newDbRows = [];
-
-        foreach ($tableNames as $table) {
-            if (!isset($this->dbRows[$table])) {
-                $this->registerTable($table);
-            }
-            $newDbRows[$table] = $this->dbRows[$table];
-        }
-        $this->dbRows = $newDbRows;
-
-        $this->status = TDBMObjectStateEnum::STATE_NEW;
-        foreach ($this->dbRows as $dbRow) {
-            $dbRow->_attach($tdbmService);
-        }
-    }
-
-    /**
-     * Sets the state of the TDBM Object
-     * One of TDBMObjectStateEnum::STATE_NEW, TDBMObjectStateEnum::STATE_NOT_LOADED, TDBMObjectStateEnum::STATE_LOADED, TDBMObjectStateEnum::STATE_DELETED.
-     * $status = TDBMObjectStateEnum::STATE_NEW when a new object is created with DBMObject:getNewObject.
-     * $status = TDBMObjectStateEnum::STATE_NOT_LOADED when the object has been retrieved with getObject but when no data has been accessed in it yet.
-     * $status = TDBMObjectStateEnum::STATE_LOADED when the object is cached in memory.
-     *
-     * @param string $state
-     */
-    public function _setStatus($state)
-    {
-        $this->status = $state;
-
-        // TODO: we might ignore the loaded => dirty state here! dirty status comes from the db_row itself.
-        foreach ($this->dbRows as $dbRow) {
-            $dbRow->_setStatus($state);
-        }
-    }
-
-    /**
-     * Checks that $tableName is ok, or returns the only possible table name if "$tableName = null"
-     * or throws an error.
-     *
-     * @param string $tableName
-     *
-     * @return string
-     */
-    private function checkTableName($tableName = null)
-    {
-        if ($tableName === null) {
-            if (count($this->dbRows) > 1) {
-                throw new TDBMException('This object is based on several tables. You must specify which table you are retrieving data from.');
-            } elseif (count($this->dbRows) === 1) {
-                $tableName = array_keys($this->dbRows)[0];
-            }
-        }
-
-        if (!isset($this->dbRows[$tableName])) {
-            if (count($this->dbRows === 0)) {
-                throw new TDBMException('Object is not yet bound to any table.');
-            } else {
-                throw new TDBMException('Unknown table "'.$tableName.'"" in object.');
-            }
-        }
-
-        return $tableName;
-    }
-
-    protected function get($var, $tableName = null)
-    {
-        $tableName = $this->checkTableName($tableName);
-
-        return $this->dbRows[$tableName]->get($var);
-    }
-
-    protected function set($var, $value, $tableName = null)
-    {
-        if ($tableName === null) {
-            if (count($this->dbRows) > 1) {
-                throw new TDBMException('This object is based on several tables. You must specify which table you are retrieving data from.');
-            } elseif (count($this->dbRows) === 1) {
-                $tableName = array_keys($this->dbRows)[0];
-            } else {
-                throw new TDBMException('Please specify a table for this object.');
-            }
-        }
-
-        if (!isset($this->dbRows[$tableName])) {
-            $this->registerTable($tableName);
-        }
-
-        $this->dbRows[$tableName]->set($var, $value);
-        if ($this->dbRows[$tableName]->_getStatus() === TDBMObjectStateEnum::STATE_DIRTY) {
-            $this->status = TDBMObjectStateEnum::STATE_DIRTY;
-        }
-    }
-
-    /**
-     * @param string             $foreignKeyName
-     * @param AbstractTDBMObject $bean
-     */
-    protected function setRef($foreignKeyName, AbstractTDBMObject $bean = null, $tableName = null)
-    {
-        if ($tableName === null) {
-            if (count($this->dbRows) > 1) {
-                throw new TDBMException('This object is based on several tables. You must specify which table you are retrieving data from.');
-            } elseif (count($this->dbRows) === 1) {
-                $tableName = array_keys($this->dbRows)[0];
-            } else {
-                throw new TDBMException('Please specify a table for this object.');
-            }
-        }
-
-        if (!isset($this->dbRows[$tableName])) {
-            $this->registerTable($tableName);
-        }
-
-        $oldLinkedBean = $this->dbRows[$tableName]->getRef($foreignKeyName);
-        if ($oldLinkedBean !== null) {
-            $oldLinkedBean->removeManyToOneRelationship($tableName, $foreignKeyName, $this);
-        }
-
-        $this->dbRows[$tableName]->setRef($foreignKeyName, $bean);
-        if ($this->dbRows[$tableName]->_getStatus() === TDBMObjectStateEnum::STATE_DIRTY) {
-            $this->status = TDBMObjectStateEnum::STATE_DIRTY;
-        }
-
-        if ($bean !== null) {
-            $bean->setManyToOneRelationship($tableName, $foreignKeyName, $this);
-        }
-    }
-
-    /**
-     * @param string $foreignKeyName A unique name for this reference
-     *
-     * @return AbstractTDBMObject|null
-     */
-    protected function getRef($foreignKeyName, $tableName = null)
-    {
-        $tableName = $this->checkTableName($tableName);
-
-        return $this->dbRows[$tableName]->getRef($foreignKeyName);
-    }
-
-    /**
-     * Adds a many to many relationship to this bean.
-     *
-     * @param string             $pivotTableName
-     * @param AbstractTDBMObject $remoteBean
-     */
-    protected function addRelationship($pivotTableName, AbstractTDBMObject $remoteBean)
-    {
-        $this->setRelationship($pivotTableName, $remoteBean, 'new');
-    }
-
-    /**
-     * Returns true if there is a relationship to this bean.
-     *
-     * @param string             $pivotTableName
-     * @param AbstractTDBMObject $remoteBean
-     *
-     * @return bool
-     */
-    protected function hasRelationship($pivotTableName, AbstractTDBMObject $remoteBean)
-    {
-        $storage = $this->retrieveRelationshipsStorage($pivotTableName);
-
-        if ($storage->contains($remoteBean)) {
-            if ($storage[$remoteBean]['status'] !== 'delete') {
-                return true;
-            }
-        }
-
-        return false;
-    }
-
-    /**
-     * Internal TDBM method. Removes a many to many relationship from this bean.
-     *
-     * @param string             $pivotTableName
-     * @param AbstractTDBMObject $remoteBean
-     */
-    public function _removeRelationship($pivotTableName, AbstractTDBMObject $remoteBean)
-    {
-        if (isset($this->relationships[$pivotTableName][$remoteBean]) && $this->relationships[$pivotTableName][$remoteBean]['status'] === 'new') {
-            unset($this->relationships[$pivotTableName][$remoteBean]);
-            unset($remoteBean->relationships[$pivotTableName][$this]);
-        } else {
-            $this->setRelationship($pivotTableName, $remoteBean, 'delete');
-        }
-    }
-
-    /**
-     * Sets many to many relationships for this bean.
-     * Adds new relationships and removes unused ones.
-     *
-     * @param $pivotTableName
-     * @param array $remoteBeans
-     */
-    protected function setRelationships($pivotTableName, array $remoteBeans)
-    {
-        $storage = $this->retrieveRelationshipsStorage($pivotTableName);
-
-        foreach ($storage as $oldRemoteBean) {
-            if (!in_array($oldRemoteBean, $remoteBeans, true)) {
-                // $oldRemoteBean must be removed
-                $this->_removeRelationship($pivotTableName, $oldRemoteBean);
-            }
-        }
-
-        foreach ($remoteBeans as $remoteBean) {
-            if (!$storage->contains($remoteBean) || $storage[$remoteBean]['status'] === 'delete') {
-                // $remoteBean must be added
-                $this->addRelationship($pivotTableName, $remoteBean);
-            }
-        }
-    }
-
-    /**
-     * Returns the list of objects linked to this bean via $pivotTableName.
-     *
-     * @param $pivotTableName
-     *
-     * @return \SplObjectStorage
-     */
-    private function retrieveRelationshipsStorage($pivotTableName)
-    {
-        $storage = $this->getRelationshipStorage($pivotTableName);
-        if ($this->status === TDBMObjectStateEnum::STATE_DETACHED || $this->status === TDBMObjectStateEnum::STATE_NEW || (isset($this->loadedRelationships[$pivotTableName]) && $this->loadedRelationships[$pivotTableName])) {
-            return $storage;
-        }
-
-        $beans = $this->tdbmService->_getRelatedBeans($pivotTableName, $this);
-        $this->loadedRelationships[$pivotTableName] = true;
-
-        foreach ($beans as $bean) {
-            if (isset($storage[$bean])) {
-                $oldStatus = $storage[$bean]['status'];
-                if ($oldStatus === 'delete') {
-                    // Keep deleted things deleted
-                    continue;
-                }
-            }
-            $this->setRelationship($pivotTableName, $bean, 'loaded');
-        }
-
-        return $storage;
-    }
-
-    /**
-     * Internal TDBM method. Returns the list of objects linked to this bean via $pivotTableName.
-     *
-     * @param $pivotTableName
-     *
-     * @return AbstractTDBMObject[]
-     */
-    public function _getRelationships($pivotTableName)
-    {
-        return $this->relationshipStorageToArray($this->retrieveRelationshipsStorage($pivotTableName));
-    }
-
-    private function relationshipStorageToArray(\SplObjectStorage $storage)
-    {
-        $beans = [];
-        foreach ($storage as $bean) {
-            $statusArr = $storage[$bean];
-            if ($statusArr['status'] !== 'delete') {
-                $beans[] = $bean;
-            }
-        }
-
-        return $beans;
-    }
-
-    /**
-     * Declares a relationship between.
-     *
-     * @param string             $pivotTableName
-     * @param AbstractTDBMObject $remoteBean
-     * @param string             $status
-     */
-    private function setRelationship($pivotTableName, AbstractTDBMObject $remoteBean, $status)
-    {
-        $storage = $this->getRelationshipStorage($pivotTableName);
-        $storage->attach($remoteBean, ['status' => $status, 'reverse' => false]);
-        if ($this->status === TDBMObjectStateEnum::STATE_LOADED) {
-            $this->_setStatus(TDBMObjectStateEnum::STATE_DIRTY);
-        }
-
-        $remoteStorage = $remoteBean->getRelationshipStorage($pivotTableName);
-        $remoteStorage->attach($this, ['status' => $status, 'reverse' => true]);
-    }
-
-    /**
-     * Returns the SplObjectStorage associated to this relationship (creates it if it does not exists).
-     *
-     * @param string $pivotTableName
-     *
-     * @return \SplObjectStorage
-     */
-    private function getRelationshipStorage(string $pivotTableName) : \SplObjectStorage
-    {
-        return $this->relationships[$pivotTableName] ?? $this->relationships[$pivotTableName] = new \SplObjectStorage();
-    }
-
-    /**
-     * Returns the SplObjectStorage associated to this relationship (creates it if it does not exists).
-     *
-     * @param string $tableName
-     * @param string $foreignKeyName
-     *
-     * @return AlterableResultIterator
-     */
-    private function getManyToOneAlterableResultIterator(string $tableName, string $foreignKeyName) : AlterableResultIterator
-    {
-        $key = $tableName.'___'.$foreignKeyName;
-
-        return $this->manyToOneRelationships[$key] ?? $this->manyToOneRelationships[$key] = new AlterableResultIterator();
-    }
-
-    /**
-     * Declares a relationship between this bean and the bean pointing to it.
-     *
-     * @param string             $tableName
-     * @param string             $foreignKeyName
-     * @param AbstractTDBMObject $remoteBean
-     */
-    private function setManyToOneRelationship(string $tableName, string $foreignKeyName, AbstractTDBMObject $remoteBean)
-    {
-        $alterableResultIterator = $this->getManyToOneAlterableResultIterator($tableName, $foreignKeyName);
-        $alterableResultIterator->add($remoteBean);
-    }
-
-    /**
-     * Declares a relationship between this bean and the bean pointing to it.
-     *
-     * @param string             $tableName
-     * @param string             $foreignKeyName
-     * @param AbstractTDBMObject $remoteBean
-     */
-    private function removeManyToOneRelationship(string $tableName, string $foreignKeyName, AbstractTDBMObject $remoteBean)
-    {
-        $alterableResultIterator = $this->getManyToOneAlterableResultIterator($tableName, $foreignKeyName);
-        $alterableResultIterator->remove($remoteBean);
-    }
-
-    /**
-     * Returns the list of objects linked to this bean via a given foreign key.
-     *
-     * @param string $tableName
-     * @param string $foreignKeyName
-     * @param string $searchTableName
-     * @param array  $searchFilter
-     * @param string $orderString The ORDER BY part of the query. All columns must be prefixed by the table name (in the form: table.column). WARNING : This parameter is not kept when there is an additionnal or removal object !
-     *
-     * @return AlterableResultIterator
-     */
-    protected function retrieveManyToOneRelationshipsStorage(string $tableName, string $foreignKeyName, string $searchTableName, array $searchFilter, $orderString = null) : AlterableResultIterator
-    {
-        $key = $tableName.'___'.$foreignKeyName;
-        $alterableResultIterator = $this->getManyToOneAlterableResultIterator($tableName, $foreignKeyName);
-        if ($this->status === TDBMObjectStateEnum::STATE_DETACHED || $this->status === TDBMObjectStateEnum::STATE_NEW || (isset($this->manyToOneRelationships[$key]) && $this->manyToOneRelationships[$key]->getUnderlyingResultIterator() !== null)) {
-            return $alterableResultIterator;
-        }
-
-        $unalteredResultIterator = $this->tdbmService->findObjects($searchTableName, $searchFilter, [], $orderString);
-
-        $alterableResultIterator->setResultIterator($unalteredResultIterator->getIterator());
-
-        return $alterableResultIterator;
-    }
-
-    /**
-     * Reverts any changes made to the object and resumes it to its DB state.
-     * This can only be called on objects that come from database and that have not been deleted.
-     * Otherwise, this will throw an exception.
-     *
-     * @throws TDBMException
-     */
-    public function discardChanges()
-    {
-        if ($this->status === TDBMObjectStateEnum::STATE_NEW || $this->status === TDBMObjectStateEnum::STATE_DETACHED) {
-            throw new TDBMException("You cannot call discardChanges() on an object that has been created with the 'new' keyword and that has not yet been saved.");
-        }
-
-        if ($this->status === TDBMObjectStateEnum::STATE_DELETED) {
-            throw new TDBMException('You cannot call discardChanges() on an object that has been deleted.');
-        }
-
-        $this->_setStatus(TDBMObjectStateEnum::STATE_NOT_LOADED);
-    }
-
-    /**
-     * Method used internally by TDBM. You should not use it directly.
-     * This method returns the status of the TDBMObject.
-     * This is one of TDBMObjectStateEnum::STATE_NEW, TDBMObjectStateEnum::STATE_NOT_LOADED, TDBMObjectStateEnum::STATE_LOADED, TDBMObjectStateEnum::STATE_DELETED.
-     * $status = TDBMObjectStateEnum::STATE_NEW when a new object is created with DBMObject:getNewObject.
-     * $status = TDBMObjectStateEnum::STATE_NOT_LOADED when the object has been retrieved with getObject but when no data has been accessed in it yet.
-     * $status = TDBMObjectStateEnum::STATE_LOADED when the object is cached in memory.
-     *
-     * @return string
-     */
-    public function _getStatus()
-    {
-        return $this->status;
-    }
-
-    /**
-     * Override the native php clone function for TDBMObjects.
-     */
-    public function __clone()
-    {
-        // Let's clone the many to many relationships
-        if ($this->status === TDBMObjectStateEnum::STATE_DETACHED) {
-            $pivotTableList = array_keys($this->relationships);
-        } else {
-            $pivotTableList = $this->tdbmService->_getPivotTablesLinkedToBean($this);
-        }
-
-        foreach ($pivotTableList as $pivotTable) {
-            $storage = $this->retrieveRelationshipsStorage($pivotTable);
-
-            // Let's duplicate the reverse side of the relationship // This is useless: already done by "retrieveRelationshipsStorage"!!!
-            /*foreach ($storage as $remoteBean) {
+	/**
+	 * The service this object is bound to.
+	 *
+	 * @var TDBMService
+	 */
+	protected $tdbmService;
+
+	/**
+	 * An array of DbRow, indexed by table name.
+	 *
+	 * @var DbRow[]
+	 */
+	protected $dbRows = array();
+
+	/**
+	 * One of TDBMObjectStateEnum::STATE_NEW, TDBMObjectStateEnum::STATE_NOT_LOADED, TDBMObjectStateEnum::STATE_LOADED, TDBMObjectStateEnum::STATE_DELETED.
+	 * $status = TDBMObjectStateEnum::STATE_NEW when a new object is created with DBMObject:getNewObject.
+	 * $status = TDBMObjectStateEnum::STATE_NOT_LOADED when the object has been retrieved with getObject but when no data has been accessed in it yet.
+	 * $status = TDBMObjectStateEnum::STATE_LOADED when the object is cached in memory.
+	 *
+	 * @var string
+	 */
+	private $status;
+
+	/**
+	 * Array storing beans related via many to many relationships (pivot tables).
+	 *
+	 * @var \SplObjectStorage[] Key: pivot table name, value: SplObjectStorage
+	 */
+	private $relationships = [];
+
+	/**
+	 * @var bool[] Key: pivot table name, value: whether a query was performed to load the data
+	 */
+	private $loadedRelationships = [];
+
+	/**
+	 * Array storing beans related via many to one relationships (this bean is pointed by external beans).
+	 *
+	 * @var AlterableResultIterator[] Key: [external_table]___[external_column], value: SplObjectStorage
+	 */
+	private $manyToOneRelationships = [];
+
+	/**
+	 * Used with $primaryKeys when we want to retrieve an existing object
+	 * and $primaryKeys=[] if we want a new object.
+	 *
+	 * @param string      $tableName
+	 * @param array       $primaryKeys
+	 * @param TDBMService $tdbmService
+	 *
+	 * @throws TDBMException
+	 * @throws TDBMInvalidOperationException
+	 */
+	public function __construct($tableName = null, array $primaryKeys = array(), TDBMService $tdbmService = null)
+	{
+		// FIXME: lazy loading should be forbidden on tables with inheritance and dynamic type assignation...
+		if (!empty($tableName)) {
+			$this->dbRows[$tableName] = new DbRow($this, $tableName, $primaryKeys, $tdbmService);
+		}
+
+		if ($tdbmService === null) {
+			$this->_setStatus(TDBMObjectStateEnum::STATE_DETACHED);
+		} else {
+			$this->_attach($tdbmService);
+			if (!empty($primaryKeys)) {
+				$this->_setStatus(TDBMObjectStateEnum::STATE_NOT_LOADED);
+			} else {
+				$this->_setStatus(TDBMObjectStateEnum::STATE_NEW);
+			}
+		}
+	}
+
+	/**
+	 * Alternative constructor called when data is fetched from database via a SELECT.
+	 *
+	 * @param array       $beanData    array<table, array<column, value>>
+	 * @param TDBMService $tdbmService
+	 */
+	public function _constructFromData(array $beanData, TDBMService $tdbmService)
+	{
+		$this->tdbmService = $tdbmService;
+
+		foreach ($beanData as $table => $columns) {
+			$this->dbRows[$table] = new DbRow($this, $table, $tdbmService->_getPrimaryKeysFromObjectData($table, $columns), $tdbmService, $columns);
+		}
+
+		$this->status = TDBMObjectStateEnum::STATE_LOADED;
+	}
+
+	/**
+	 * Alternative constructor called when bean is lazily loaded.
+	 *
+	 * @param string      $tableName
+	 * @param array       $primaryKeys
+	 * @param TDBMService $tdbmService
+	 */
+	public function _constructLazy($tableName, array $primaryKeys, TDBMService $tdbmService)
+	{
+		$this->tdbmService = $tdbmService;
+
+		$this->dbRows[$tableName] = new DbRow($this, $tableName, $primaryKeys, $tdbmService);
+
+		$this->status = TDBMObjectStateEnum::STATE_NOT_LOADED;
+	}
+
+	public function _attach(TDBMService $tdbmService)
+	{
+		if ($this->status !== TDBMObjectStateEnum::STATE_DETACHED) {
+			throw new TDBMInvalidOperationException('Cannot attach an object that is already attached to TDBM.');
+		}
+		$this->tdbmService = $tdbmService;
+
+		// If we attach this object, we must work to make sure the tables are in ascending order (from low level to top level)
+		$tableNames = $this->getUsedTables();
+
+		$newDbRows = [];
+
+		foreach ($tableNames as $table) {
+			if (!isset($this->dbRows[$table])) {
+				$this->registerTable($table);
+			}
+			$newDbRows[$table] = $this->dbRows[$table];
+		}
+		$this->dbRows = $newDbRows;
+
+		$this->status = TDBMObjectStateEnum::STATE_NEW;
+		foreach ($this->dbRows as $dbRow) {
+			$dbRow->_attach($tdbmService);
+		}
+	}
+
+	/**
+	 * Sets the state of the TDBM Object
+	 * One of TDBMObjectStateEnum::STATE_NEW, TDBMObjectStateEnum::STATE_NOT_LOADED, TDBMObjectStateEnum::STATE_LOADED, TDBMObjectStateEnum::STATE_DELETED.
+	 * $status = TDBMObjectStateEnum::STATE_NEW when a new object is created with DBMObject:getNewObject.
+	 * $status = TDBMObjectStateEnum::STATE_NOT_LOADED when the object has been retrieved with getObject but when no data has been accessed in it yet.
+	 * $status = TDBMObjectStateEnum::STATE_LOADED when the object is cached in memory.
+	 *
+	 * @param string $state
+	 */
+	public function _setStatus($state)
+	{
+		$this->status = $state;
+
+		// TODO: we might ignore the loaded => dirty state here! dirty status comes from the db_row itself.
+		foreach ($this->dbRows as $dbRow) {
+			$dbRow->_setStatus($state);
+		}
+	}
+
+	/**
+	 * Checks that $tableName is ok, or returns the only possible table name if "$tableName = null"
+	 * or throws an error.
+	 *
+	 * @param string $tableName
+	 *
+	 * @return string
+	 */
+	private function checkTableName($tableName = null)
+	{
+		if ($tableName === null) {
+			if (count($this->dbRows) > 1) {
+				throw new TDBMException('This object is based on several tables. You must specify which table you are retrieving data from.');
+			} elseif (count($this->dbRows) === 1) {
+				$tableName = array_keys($this->dbRows)[0];
+			}
+		}
+
+		if (!isset($this->dbRows[$tableName])) {
+			if (count($this->dbRows === 0)) {
+				throw new TDBMException('Object is not yet bound to any table.');
+			} else {
+				throw new TDBMException('Unknown table "'.$tableName.'"" in object.');
+			}
+		}
+
+		return $tableName;
+	}
+
+	protected function get($var, $tableName = null)
+	{
+		$tableName = $this->checkTableName($tableName);
+
+		return $this->dbRows[$tableName]->get($var);
+	}
+
+	protected function set($var, $value, $tableName = null)
+	{
+		if ($tableName === null) {
+			if (count($this->dbRows) > 1) {
+				throw new TDBMException('This object is based on several tables. You must specify which table you are retrieving data from.');
+			} elseif (count($this->dbRows) === 1) {
+				$tableName = array_keys($this->dbRows)[0];
+			} else {
+				throw new TDBMException('Please specify a table for this object.');
+			}
+		}
+
+		if (!isset($this->dbRows[$tableName])) {
+			$this->registerTable($tableName);
+		}
+
+		$this->dbRows[$tableName]->set($var, $value);
+		if ($this->dbRows[$tableName]->_getStatus() === TDBMObjectStateEnum::STATE_DIRTY) {
+			$this->status = TDBMObjectStateEnum::STATE_DIRTY;
+		}
+	}
+
+	/**
+	 * @param string             $foreignKeyName
+	 * @param AbstractTDBMObject $bean
+	 */
+	protected function setRef($foreignKeyName, AbstractTDBMObject $bean = null, $tableName = null)
+	{
+		if ($tableName === null) {
+			if (count($this->dbRows) > 1) {
+				throw new TDBMException('This object is based on several tables. You must specify which table you are retrieving data from.');
+			} elseif (count($this->dbRows) === 1) {
+				$tableName = array_keys($this->dbRows)[0];
+			} else {
+				throw new TDBMException('Please specify a table for this object.');
+			}
+		}
+
+		if (!isset($this->dbRows[$tableName])) {
+			$this->registerTable($tableName);
+		}
+
+		$oldLinkedBean = $this->dbRows[$tableName]->getRef($foreignKeyName);
+		if ($oldLinkedBean !== null) {
+			$oldLinkedBean->removeManyToOneRelationship($tableName, $foreignKeyName, $this);
+		}
+
+		$this->dbRows[$tableName]->setRef($foreignKeyName, $bean);
+		if ($this->dbRows[$tableName]->_getStatus() === TDBMObjectStateEnum::STATE_DIRTY) {
+			$this->status = TDBMObjectStateEnum::STATE_DIRTY;
+		}
+
+		if ($bean !== null) {
+			$bean->setManyToOneRelationship($tableName, $foreignKeyName, $this);
+		}
+	}
+
+	/**
+	 * @param string $foreignKeyName A unique name for this reference
+	 *
+	 * @return AbstractTDBMObject|null
+	 */
+	protected function getRef($foreignKeyName, $tableName = null)
+	{
+		$tableName = $this->checkTableName($tableName);
+
+		return $this->dbRows[$tableName]->getRef($foreignKeyName);
+	}
+
+	/**
+	 * Adds a many to many relationship to this bean.
+	 *
+	 * @param string             $pivotTableName
+	 * @param AbstractTDBMObject $remoteBean
+	 */
+	protected function addRelationship($pivotTableName, AbstractTDBMObject $remoteBean)
+	{
+		$this->setRelationship($pivotTableName, $remoteBean, 'new');
+	}
+
+	/**
+	 * Returns true if there is a relationship to this bean.
+	 *
+	 * @param string             $pivotTableName
+	 * @param AbstractTDBMObject $remoteBean
+	 *
+	 * @return bool
+	 */
+	protected function hasRelationship($pivotTableName, AbstractTDBMObject $remoteBean)
+	{
+		$storage = $this->retrieveRelationshipsStorage($pivotTableName);
+
+		if ($storage->contains($remoteBean)) {
+			if ($storage[$remoteBean]['status'] !== 'delete') {
+				return true;
+			}
+		}
+
+		return false;
+	}
+
+	/**
+	 * Internal TDBM method. Removes a many to many relationship from this bean.
+	 *
+	 * @param string             $pivotTableName
+	 * @param AbstractTDBMObject $remoteBean
+	 */
+	public function _removeRelationship($pivotTableName, AbstractTDBMObject $remoteBean)
+	{
+		if (isset($this->relationships[$pivotTableName][$remoteBean]) && $this->relationships[$pivotTableName][$remoteBean]['status'] === 'new') {
+			unset($this->relationships[$pivotTableName][$remoteBean]);
+			unset($remoteBean->relationships[$pivotTableName][$this]);
+		} else {
+			$this->setRelationship($pivotTableName, $remoteBean, 'delete');
+		}
+	}
+
+	/**
+	 * Sets many to many relationships for this bean.
+	 * Adds new relationships and removes unused ones.
+	 *
+	 * @param $pivotTableName
+	 * @param array $remoteBeans
+	 */
+	protected function setRelationships($pivotTableName, array $remoteBeans)
+	{
+		$storage = $this->retrieveRelationshipsStorage($pivotTableName);
+
+		foreach ($storage as $oldRemoteBean) {
+			if (!in_array($oldRemoteBean, $remoteBeans, true)) {
+				// $oldRemoteBean must be removed
+				$this->_removeRelationship($pivotTableName, $oldRemoteBean);
+			}
+		}
+
+		foreach ($remoteBeans as $remoteBean) {
+			if (!$storage->contains($remoteBean) || $storage[$remoteBean]['status'] === 'delete') {
+				// $remoteBean must be added
+				$this->addRelationship($pivotTableName, $remoteBean);
+			}
+		}
+	}
+
+	/**
+	 * Returns the list of objects linked to this bean via $pivotTableName.
+	 *
+	 * @param $pivotTableName
+	 *
+	 * @return \SplObjectStorage
+	 */
+	private function retrieveRelationshipsStorage($pivotTableName)
+	{
+		$storage = $this->getRelationshipStorage($pivotTableName);
+		if ($this->status === TDBMObjectStateEnum::STATE_DETACHED || $this->status === TDBMObjectStateEnum::STATE_NEW || (isset($this->loadedRelationships[$pivotTableName]) && $this->loadedRelationships[$pivotTableName])) {
+			return $storage;
+		}
+
+		$beans = $this->tdbmService->_getRelatedBeans($pivotTableName, $this);
+		$this->loadedRelationships[$pivotTableName] = true;
+
+		foreach ($beans as $bean) {
+			if (isset($storage[$bean])) {
+				$oldStatus = $storage[$bean]['status'];
+				if ($oldStatus === 'delete') {
+					// Keep deleted things deleted
+					continue;
+				}
+			}
+			$this->setRelationship($pivotTableName, $bean, 'loaded');
+		}
+
+		return $storage;
+	}
+
+	/**
+	 * Internal TDBM method. Returns the list of objects linked to this bean via $pivotTableName.
+	 *
+	 * @param $pivotTableName
+	 *
+	 * @return AbstractTDBMObject[]
+	 */
+	public function _getRelationships($pivotTableName)
+	{
+		return $this->relationshipStorageToArray($this->retrieveRelationshipsStorage($pivotTableName));
+	}
+
+	private function relationshipStorageToArray(\SplObjectStorage $storage)
+	{
+		$beans = [];
+		foreach ($storage as $bean) {
+			$statusArr = $storage[$bean];
+			if ($statusArr['status'] !== 'delete') {
+				$beans[] = $bean;
+			}
+		}
+
+		return $beans;
+	}
+
+	/**
+	 * Declares a relationship between.
+	 *
+	 * @param string             $pivotTableName
+	 * @param AbstractTDBMObject $remoteBean
+	 * @param string             $status
+	 */
+	private function setRelationship($pivotTableName, AbstractTDBMObject $remoteBean, $status)
+	{
+		$storage = $this->getRelationshipStorage($pivotTableName);
+		$storage->attach($remoteBean, ['status' => $status, 'reverse' => false]);
+		if ($this->status === TDBMObjectStateEnum::STATE_LOADED) {
+			$this->_setStatus(TDBMObjectStateEnum::STATE_DIRTY);
+		}
+
+		$remoteStorage = $remoteBean->getRelationshipStorage($pivotTableName);
+		$remoteStorage->attach($this, ['status' => $status, 'reverse' => true]);
+	}
+
+	/**
+	 * Returns the SplObjectStorage associated to this relationship (creates it if it does not exists).
+	 *
+	 * @param string $pivotTableName
+	 *
+	 * @return \SplObjectStorage
+	 */
+	private function getRelationshipStorage(string $pivotTableName) : \SplObjectStorage
+	{
+		return $this->relationships[$pivotTableName] ?? $this->relationships[$pivotTableName] = new \SplObjectStorage();
+	}
+
+	/**
+	 * Returns the SplObjectStorage associated to this relationship (creates it if it does not exists).
+	 *
+	 * @param string $tableName
+	 * @param string $foreignKeyName
+	 *
+	 * @return AlterableResultIterator
+	 */
+	private function getManyToOneAlterableResultIterator(string $tableName, string $foreignKeyName) : AlterableResultIterator
+	{
+		$key = $tableName.'___'.$foreignKeyName;
+
+		return $this->manyToOneRelationships[$key] ?? $this->manyToOneRelationships[$key] = new AlterableResultIterator();
+	}
+
+	/**
+	 * Declares a relationship between this bean and the bean pointing to it.
+	 *
+	 * @param string             $tableName
+	 * @param string             $foreignKeyName
+	 * @param AbstractTDBMObject $remoteBean
+	 */
+	private function setManyToOneRelationship(string $tableName, string $foreignKeyName, AbstractTDBMObject $remoteBean)
+	{
+		$alterableResultIterator = $this->getManyToOneAlterableResultIterator($tableName, $foreignKeyName);
+		$alterableResultIterator->add($remoteBean);
+	}
+
+	/**
+	 * Declares a relationship between this bean and the bean pointing to it.
+	 *
+	 * @param string             $tableName
+	 * @param string             $foreignKeyName
+	 * @param AbstractTDBMObject $remoteBean
+	 */
+	private function removeManyToOneRelationship(string $tableName, string $foreignKeyName, AbstractTDBMObject $remoteBean)
+	{
+		$alterableResultIterator = $this->getManyToOneAlterableResultIterator($tableName, $foreignKeyName);
+		$alterableResultIterator->remove($remoteBean);
+	}
+
+	/**
+	 * Returns the list of objects linked to this bean via a given foreign key.
+	 *
+	 * @param string $tableName
+	 * @param string $foreignKeyName
+	 * @param string $searchTableName
+	 * @param array  $searchFilter
+	 * @param string $orderString The ORDER BY part of the query. All columns must be prefixed by the table name (in the form: table.column). WARNING : This parameter is not kept when there is an additionnal or removal object !
+	 *
+	 * @return AlterableResultIterator
+	 */
+	protected function retrieveManyToOneRelationshipsStorage(string $tableName, string $foreignKeyName, string $searchTableName, array $searchFilter, $orderString = null) : AlterableResultIterator
+	{
+		$key = $tableName.'___'.$foreignKeyName;
+		$alterableResultIterator = $this->getManyToOneAlterableResultIterator($tableName, $foreignKeyName);
+		if ($this->status === TDBMObjectStateEnum::STATE_DETACHED || $this->status === TDBMObjectStateEnum::STATE_NEW || (isset($this->manyToOneRelationships[$key]) && $this->manyToOneRelationships[$key]->getUnderlyingResultIterator() !== null)) {
+			return $alterableResultIterator;
+		}
+
+		$unalteredResultIterator = $this->tdbmService->findObjects($searchTableName, $searchFilter, [], $orderString);
+
+		$alterableResultIterator->setResultIterator($unalteredResultIterator->getIterator());
+
+		return $alterableResultIterator;
+	}
+
+	/**
+	 * Reverts any changes made to the object and resumes it to its DB state.
+	 * This can only be called on objects that come from database and that have not been deleted.
+	 * Otherwise, this will throw an exception.
+	 *
+	 * @throws TDBMException
+	 */
+	public function discardChanges()
+	{
+		if ($this->status === TDBMObjectStateEnum::STATE_NEW || $this->status === TDBMObjectStateEnum::STATE_DETACHED) {
+			throw new TDBMException("You cannot call discardChanges() on an object that has been created with the 'new' keyword and that has not yet been saved.");
+		}
+
+		if ($this->status === TDBMObjectStateEnum::STATE_DELETED) {
+			throw new TDBMException('You cannot call discardChanges() on an object that has been deleted.');
+		}
+
+		$this->_setStatus(TDBMObjectStateEnum::STATE_NOT_LOADED);
+	}
+
+	/**
+	 * Method used internally by TDBM. You should not use it directly.
+	 * This method returns the status of the TDBMObject.
+	 * This is one of TDBMObjectStateEnum::STATE_NEW, TDBMObjectStateEnum::STATE_NOT_LOADED, TDBMObjectStateEnum::STATE_LOADED, TDBMObjectStateEnum::STATE_DELETED.
+	 * $status = TDBMObjectStateEnum::STATE_NEW when a new object is created with DBMObject:getNewObject.
+	 * $status = TDBMObjectStateEnum::STATE_NOT_LOADED when the object has been retrieved with getObject but when no data has been accessed in it yet.
+	 * $status = TDBMObjectStateEnum::STATE_LOADED when the object is cached in memory.
+	 *
+	 * @return string
+	 */
+	public function _getStatus()
+	{
+		return $this->status;
+	}
+
+	/**
+	 * Override the native php clone function for TDBMObjects.
+	 */
+	public function __clone()
+	{
+		// Let's clone the many to many relationships
+		if ($this->status === TDBMObjectStateEnum::STATE_DETACHED) {
+			$pivotTableList = array_keys($this->relationships);
+		} else {
+			$pivotTableList = $this->tdbmService->_getPivotTablesLinkedToBean($this);
+		}
+
+		foreach ($pivotTableList as $pivotTable) {
+			$storage = $this->retrieveRelationshipsStorage($pivotTable);
+
+			// Let's duplicate the reverse side of the relationship // This is useless: already done by "retrieveRelationshipsStorage"!!!
+			/*foreach ($storage as $remoteBean) {
                 $metadata = $storage[$remoteBean];
 
                 $remoteStorage = $remoteBean->getRelationshipStorage($pivotTable);
                 $remoteStorage->attach($this, ['status' => $metadata['status'], 'reverse' => !$metadata['reverse']]);
             }*/
-        }
-
-        // Let's clone each row
-        foreach ($this->dbRows as $key => &$dbRow) {
-            $dbRow = clone $dbRow;
-            $dbRow->setTDBMObject($this);
-        }
-
-        $this->manyToOneRelationships = [];
-
-        // Let's set the status to new (to enter the save function)
-        $this->status = TDBMObjectStateEnum::STATE_DETACHED;
-    }
-
-    /**
-     * Returns raw database rows.
-     *
-     * @return DbRow[] Key: table name, Value: DbRow object
-     */
-    public function _getDbRows()
-    {
-        return $this->dbRows;
-    }
-
-    private function registerTable($tableName)
-    {
-        $dbRow = new DbRow($this, $tableName);
-
-        if (in_array($this->status, [TDBMObjectStateEnum::STATE_NOT_LOADED, TDBMObjectStateEnum::STATE_LOADED, TDBMObjectStateEnum::STATE_DIRTY])) {
-            // Let's get the primary key for the new table
-            $anotherDbRow = array_values($this->dbRows)[0];
-            /* @var $anotherDbRow DbRow */
-            $indexedPrimaryKeys = array_values($anotherDbRow->_getPrimaryKeys());
-            $primaryKeys = $this->tdbmService->_getPrimaryKeysFromIndexedPrimaryKeys($tableName, $indexedPrimaryKeys);
-            $dbRow->_setPrimaryKeys($primaryKeys);
-        }
-
-        $dbRow->_setStatus($this->status);
-
-        $this->dbRows[$tableName] = $dbRow;
-        // TODO: look at status (if not new)=> get primary key from tdbmservice
-    }
-
-    /**
-     * Internal function: return the list of relationships.
-     *
-     * @return \SplObjectStorage[]
-     */
-    public function _getCachedRelationships()
-    {
-        return $this->relationships;
-    }
-
-    /**
-     * Returns an array of used tables by this bean (from parent to child relationship).
-     *
-     * @return string[]
-     */
-    abstract protected function getUsedTables();
+		}
+
+		// Let's clone each row
+		foreach ($this->dbRows as $key => &$dbRow) {
+			$dbRow = clone $dbRow;
+			$dbRow->setTDBMObject($this);
+		}
+
+		$this->manyToOneRelationships = [];
+
+		// Let's set the status to new (to enter the save function)
+		$this->status = TDBMObjectStateEnum::STATE_DETACHED;
+	}
+
+	/**
+	 * Returns raw database rows.
+	 *
+	 * @return DbRow[] Key: table name, Value: DbRow object
+	 */
+	public function _getDbRows()
+	{
+		return $this->dbRows;
+	}
+
+	private function registerTable($tableName)
+	{
+		$dbRow = new DbRow($this, $tableName);
+
+		if (in_array($this->status, [TDBMObjectStateEnum::STATE_NOT_LOADED, TDBMObjectStateEnum::STATE_LOADED, TDBMObjectStateEnum::STATE_DIRTY])) {
+			// Let's get the primary key for the new table
+			$anotherDbRow = array_values($this->dbRows)[0];
+			/* @var $anotherDbRow DbRow */
+			$indexedPrimaryKeys = array_values($anotherDbRow->_getPrimaryKeys());
+			$primaryKeys = $this->tdbmService->_getPrimaryKeysFromIndexedPrimaryKeys($tableName, $indexedPrimaryKeys);
+			$dbRow->_setPrimaryKeys($primaryKeys);
+		}
+
+		$dbRow->_setStatus($this->status);
+
+		$this->dbRows[$tableName] = $dbRow;
+		// TODO: look at status (if not new)=> get primary key from tdbmservice
+	}
+
+	/**
+	 * Internal function: return the list of relationships.
+	 *
+	 * @return \SplObjectStorage[]
+	 */
+	public function _getCachedRelationships()
+	{
+		return $this->relationships;
+	}
+
+	/**
+	 * Returns an array of used tables by this bean (from parent to child relationship).
+	 *
+	 * @return string[]
+	 */
+	abstract protected function getUsedTables();
 }