public function get_all($model_identifier = null, $offset = 0, $limit = 15, $column = '*', $sort_by = '', $descending = false)
 {
     if (!$model_identifier) {
         $model_identifier = $this->model->get_identifier();
     }
     $results = RM_DBManager::get_all($model_identifier, $offset, $limit, $column, $sort_by, $descending);
     return $results;
 }
 public function add_form()
 {
     $forms = RM_DBManager::get_all(RM_Forms::get_identifier(), $offset = 0, $limit = 1000, $column = 'form_name,form_id', $sort_by = '', $descending = false);
     return $forms;
 }