How to add Composite primary key in YII Framework

Question

I am stuck in creating composite primary key in yii...i have following tables..

**Branche**
id
name

**Item**
id
name

**branch_item**
branch_id
item_id

how to create branch_item in yii with composite primary key...(and crud with gii)

is it ok if i create table like this...

**branch_item**
id (this is the primary key)
branch_id (unique key)
item_id (unique key)

what is the best way create composite id or create id with unique keys...

Answer 1

It is mentioned in yii guide, a bit not highlighted through.

In short, just ovveride method primaryKey like that:

public function primaryKey()
{
    return array('pk1', 'pk2');
}

Also see Yii Model with composite primary key