How to set conditions when adding to the database in YII?

Question

Yii

This is how I put it in the database

$list=new MyList;
        $list->newid = $com;
        $list->title='тестовая запись';
        $list->description='содержимое тестовой записи';
        $list->save();

All through active record. Question: how can I write a condition that there is no entry equal to $com in the newid column ?

Answer 1

Make a unique field in the database?

Answer 2

Do not forget to check validate() or save() first to find out if the data passed validation, otherwise you will think that you saved the data and it returned false