fewbricks\bricks\brick::set_is_sub_field PHP Method

    public function set_is_sub_field($is_sub_field)
    {
        $this->is_sub_field = $is_sub_field;
        return $this;
    }

 /**
  * @param \fewbricks\bricks\brick $brick
  * @return $this
  */
 public function add_brick($brick)
 {
     $brick->set_is_sub_field(true);
     $brick_settings = $brick->get_settings($this);
     foreach ($brick_settings['fields'] as $brick_field) {
         $this->settings['sub_fields'][] = $brick_field;
     }
     return $this;
 }