/**
* Count the number of linked models for givent instances.
*
*/
public function countRelation(Relation $relation, array $objects, array $localOptions = array())
{
$lmClass = $relation->lm->class;
$this->setRoot($lmClass);
$lmAttributePrefix = '';
if ($relation instanceof Relation\ManyMany) {
$reversed = $relation->reverse();
$lmClass::relation($reversed->name, $reversed);
$lmAttributePrefix = $reversed->name . '/';
$relation = $reversed;
}
// Get CM join attributes values for each given objects.
$cmValues = array();
foreach ($objects as $o) {
$cmValues[] = $o->get($relation->getCmAttributes());
}
$lmAttributes = $relation->getLmAttributes();
if ($lmAttributePrefix) {
foreach ($lmAttributes as &$attr) {
$attr = $lmAttributePrefix . $attr;
}
}
$options['conditions'] = (array) $relation->conditions;
$options = array_merge($options, $localOptions);
$q = $this->newSelect();
$this->setOptions($options);
$q->whereTuple($lmAttributes, $cmValues);
if ($scope = $relation->getScope()) {
$this->applyScopes($scope);
}
$pk = $lmClass::table()->getPrimaryKey();
return $this->count(DB::distinct($pk));
}
