Most often, it is better to override save() and delete() methods in model level, instead of doing in admin generator's actions.class.php, i.e., the view layer. This is how:

Say we are extending the 'MyObj' class. Put the following in file

lib/model/MyObj.php

<?php

/**
 * Subclass for representing a row from the table.
 *
 * @package lib.model
 */
class MyObj extends BaseMyObj
{
    // == Extend the model for business logic

    public function save($con = null)
    {
        // == pre save hook
        // fill prereq fields

        // == call the parent save() method
        parent::save($con);

        // == post save hook
        // fill extra fields
        $update_comment = ...;
        $this->doAddComment($update_comment);
    }
}

documented on: 2007.08.22