function get_tables_from_shift()
 {
     $this->common->authenticate();
     $shift_id = $this->input->post('shift_id');
     $day = $this->input->post('day');
     $for_vegans = $day == NORMAL_DAY ? 0 : NULL;
     $this->load->model('tables_model');
     $this->load->model('shifts_model');
     $tables = Tables_model::get_tables_by_shift($shift_id, $for_vegans, $day);
     $data['tables'] = $tables;
     $data['shift'] = Shifts_model::get_shift_by_id($shift_id);
     echo json_encode($data);
 }
 public function load_edit_shift_view($shift_id)
 {
     $message = array('title', 'description', 'manage_shifts', 'start_time', 'end_time', 'shift', 'edit');
     $data = $this->common->set_language_and_data('edit_shift', $message);
     $data['shift'] = Shifts_model::get_shift_by_id($shift_id);
     $this->common->load_view('admin/shifts/edit_shift', $data);
 }