Unknown column - multiple joins in CDbCriteria - activerecord

Question

I'm trying to get data from multiple tables and I've ended with this error:
SQL: SQLSTATE[42S22]: Column not found: 1054 Unknown column 'p.firstname' in 'field list'
$criteria = new CDbCriteria;
$criteria->select = 'ohu_id, hash, p.firstname, p.surname, p.city, u.email AS Email';
$criteria->join = 'LEFT JOIN `profiles` p ON p.user_id = user_id';
$criteria->join = 'LEFT JOIN users u ON user_id = u.id';
$criteria->condition = 'offer_id = :oID';
$criteria->params = array(':oID' => $_GET['id']);
$model = MyModel::model()->findAll($criteria);
Anyone know what I'm doing wrong?
Or is there better way to get related data?

Answer 1

You are making the same mistake I made hehe.
You are overwriting the first join with the second one, instead of appending the second join.
$criteria->join = "join ...."; //first join
$criteria->join .= "join ...."; //second join
cheers

Answer 2

Actually its way better to user some "with" clause like this:
$criteria->with = array(
'profiles '=>array(
'select'=>'profiles.user_id',
'together'=>true
),
'users'=>array(
'select'=>'users.id',
'together'=>true
)
);
You can use this also in model searching for CGridView DataProvider.

Answer 3

It's better if you show your database structure. But here it's the solution to join multiple tables using left join
Code to join tables:
$criteria->select = 'ohu_id, hash, p.firstname, p.surname, p.city, u.email AS Email';
$criteria->alias = 'c';
$criteria->join = 'LEFT JOIN profiles p ON (p.user_id = c.user_id) LEFT JOIN users u ON (c.user_id = u.id)';
Hope it will help you.