/**
  * @param Schema $schema
  * @param string $resRelationshipName
  */
 private function getBelongToManyRelationshipModelClass(Schema $schema, $resRelationshipName)
 {
     list($relSchemaType) = $schema->getBelongsToManyRelationshipsMap()[$resRelationshipName];
     $relSchema = $this->getSchemaContainer()->getSchemaByResourceType($relSchemaType);
     $modelClass = $relSchema::MODEL;
     return $modelClass;
 }