Exemple #1
0
 /**
  * Checks whether the $model exists in the database.
  *
  * @param string $targetClass the name of the ActiveRecord class that should be used to validate the uniqueness
  * of the current attribute value.
  * @param array $conditions conditions, compatible with [[\yii\db\Query::where()|Query::where()]] key-value format.
  * @param Model $model the data model to be validated
  *
  * @return bool whether the model already exists
  */
 private function modelExists($targetClass, $conditions, $model)
 {
     /** @var ActiveRecordInterface $targetClass $query */
     $query = $this->prepareQuery($targetClass, $conditions);
     if (!$model instanceof ActiveRecordInterface || $model->getIsNewRecord() || $model->className() !== $targetClass::className()) {
         // if current $model isn't in the database yet then it's OK just to call exists()
         // also there's no need to run check based on primary keys, when $targetClass is not the same as $model's class
         $exists = $query->exists();
     } else {
         // if current $model is in the database already we can't use exists()
         /** @var $models ActiveRecordInterface[] */
         $models = $query->select($targetClass::primaryKey())->limit(2)->all();
         $n = count($models);
         if ($n === 1) {
             $keys = array_keys($conditions);
             $pks = $targetClass::primaryKey();
             sort($keys);
             sort($pks);
             if ($keys === $pks) {
                 // primary key is modified and not unique
                 $exists = $model->getOldPrimaryKey() != $model->getPrimaryKey();
             } else {
                 // non-primary key, need to exclude the current record based on PK
                 $exists = reset($models)->getPrimaryKey() != $model->getOldPrimaryKey();
             }
         } else {
             $exists = $n > 1;
         }
     }
     return $exists;
 }