model_add_dynamic_field.php

public function add_field($code, $title, $side = 'full', $type = db_text, $just_column = false)
{
  $this->custom_columns[$code] = $type;
  $this->_columns_def = null;
  $col = $this->define_column($code, $title)->validation();
  
  if ( !$just_column ) {
    $form_field = $this->add_form_field($code, $side)->optionsMethod('get_added_field_options');
    $this->added_fields[$code] = $form_field;
    return $form_field;
  }
  
  return $col;
}