public function create_default_email_field($form_id)
 {
     $field = new RM_Fields();
     $field->set(array('form_id' => $form_id, 'field_type' => 'Email', 'field_label' => 'Email', 'field_placeholder' => 'Email', 'field_css_class' => 'rm_form_default_fields', 'field_is_required' => 1, 'field_show_on_user_page' => 0, 'field_is_read_only' => 0, 'is_field_primary' => 1));
     return $field->insert_into_db();
 }