CakePHP: One column -> one TRUE

问题

Hope someone could help me with this:

I would like to have a column that will contain one and only one TRUE value. I want to set a value of TRUE (or '1') to a row and be assured that the remaining rows are FALSE (or '0').

How this could be achieved with CakePHP?

回答1:

You can't enforce this at the database level (well, you can if you use triggers) so you'll have to enforce it using Model::beforeSave()

Something along the lines of:

public function afterSave() {

    if ($this->data['Model']['field'] == 1) {
        // set all other records to false
        $this->updateAll(array('field'=>0));
    }

}

When the record is saved, it should be the only one with 'field' set to true.

来源：https://stackoverflow.com/questions/11259394/cakephp-one-column-one-true