/**
* Updates the value of the inverse var (always a one-way action)
* @param epObject $o The opposite object
* @param string $actoin The action to be taken: INVERSE_ADD or INVERSE_REMOVE
* @return bool
*/
protected function _updateInverse(&$o, $action = epObject::INVERSE_ADD)
{
// check if object is epObject
if (!$o || !$this->fm || !$o instanceof epObject) {
return false;
}
// get inverse var
if (!($ivar = $this->fm->getInverse())) {
return true;
}
// no action if an object is updating (to prevent endless loop)
if ($o->epIsUpdating($action)) {
return true;
}
// set inverse updating flag
$this->o->epSetUpdating(true, $action);
$o->epSetUpdating(true, $action);
// a single-valued field
if (!$o->epIsMany($ivar)) {
switch ($action) {
case epObject::INVERSE_ADD:
$o[$ivar] = $this->o;
break;
case epObject::INVERSE_REMOVE:
$o[$ivar] = null;
break;
}
} else {
switch ($action) {
case epObject::INVERSE_ADD:
$o[$ivar][] = $this->o;
break;
case epObject::INVERSE_REMOVE:
$o[$ivar]->remove($this->o);
break;
}
}
// reset inverse updating flag
$o->epSetUpdating(false, $action);
$this->o->epSetUpdating(false, $action);
return true;
}