yii CDbCriteria Join Column not found - mysql

Question

I've been struggling with converting the following SQL to CDBCriteria to be used with a CActiveDataProvider:
"SELECT PresetDeviceLink., Device. FROM PresetDeviceLink INNER JOIN Device ON Device.id = PresetDeviceLink.deviceId WHERE Device.roomId = 1"
Table structure is as follows:
mysql> describe PresetDeviceLink;
+----------+---------+------+-----+---------+----------------+
| Field | Type | Null | Key | Default | Extra |
+----------+---------+------+-----+---------+----------------+
| id | int(11) | NO | PRI | NULL | auto_increment |
| presetId | int(11) | NO | | NULL | |
| deviceId | int(11) | NO | | NULL | |
| state | int(11) | NO | | 0 | |
| value | int(11) | NO | | 32 | |
+----------+---------+------+-----+---------+----------------+
mysql> describe Device;
+-------------+--------------+------+-----+---------+----------------+
| Field | Type | Null | Key | Default | Extra |
+-------------+--------------+------+-----+---------+----------------+
| id | int(11) | NO | PRI | NULL | auto_increment |
| ref | int(11) | NO | | NULL | |
| roomId | int(11) | NO | | NULL | |
| typeId | int(11) | NO | | NULL | |
| paired | tinyint(1) | NO | | 0 | |
| name | varchar(255) | YES | | NULL | |
| description | text | YES | | NULL | |
| dimmerPos | int(11) | NO | | 0 | |
+-------------+--------------+------+-----+---------+----------------+
My code in my controller is as follows:
$criteria = new CDbCriteria;
$criteria->select = 'PresetDeviceLink.*, Device.*';
$criteria->join = 'INNER JOIN Device ON Device.id = PresetDeviceLink.deviceId';
$criteria->condition = 'Device.roomId = 1';
$presetDeviceLink=new CActiveDataProvider('PresetDeviceLink', array(
'criteria' => $criteria,
));
When run I get the following error:
CDbCommand failed to execute the SQL statement: SQLSTATE[42S22]: <b>Column not
found</b>: 1054 Unknown column 'PresetDeviceLink.deviceId' in 'on clause'. The SQL
statement executed was: SELECT COUNT(*) FROM `PresetDeviceLink` `t` INNER JOIN
Device ON Device.id = PresetDeviceLink.deviceId WHERE Device.roomId = 1
The strange thing is, If I use 'Device' as the CActiveDataProvider source and change the join statement to join to 'PresetDeviceLink', it then complains that the Device.roomId column could not be found.
Do I just not understand how CActiveDataProvider works? It looks to me that I can only use a condition (in a join or where clause) from a field in the table that I pass to the CActiveDataProvider. Any advice?
PS - the SQL query works beautifully in the MySQL console.
Thanks in advance,
Ben

Answer 1

As is visible in the "The SQL statement executed was:" line, the first table was aliased to t. This is Yii's standard behaviour.
As a result of this, you should use that alias to refer to that table instead of PresetDeviceLink. Or you could try setting $criteria->alias = 'PresetDeviceLink'; before using it in the CActiveDataProvider, though I have not personally tried that option, it should work.