YII Active Record Join - php

Question

I am looking at YII for the first day, and i'm having some problems trying to work out the relations between some tables.
my table structure is as follows:
Pets:
pet_id
pet_name
....
Pet_Owner_Link
pet_id
owner_id
Owner:
owner_id
owner_name
How would I go about getting all of the pets that belong to an owner? Really struggling to get my head around the AR relations at the moment.

Answer 1

Per this comment by DD.Jarod on the Yii AR documentation page: http://www.yiiframework.com/doc/guide/1.1/en/database.arr#c970
"If you declare a many to many relationship, the order of keys inside the jointable declaration must be 'my_id, other_id':
class Post extends CActiveRecord
{
public function relations()
{
return array(
'categories'=>array(self::MANY_MANY, 'Category',
'tbl_post_category(post_id, category_id)'),
);
}
}
class Category extends CActiveRecord
{
public function relations()
{
return array(
'Posts'=>array(self::MANY_MANY, 'Post',
'tbl_post_category(category_id, post_id)'),
);
}
}
So your code would look like:
class Owner extends CActiveRecord
{
public function relations()
{
return array(
'pets'=>array(self::MANY_MANY, 'Pet',
'tbl_post_category(pet_id, owner_id)'),
);
}
}
class Pet extends CActiveRecord
{
public function relations()
{
return array(
'owners'=>array(self::MANY_MANY, 'Post',
'tbl_post_category(owner_id, pet_id)'),
);
}
}
Your problem may be that your primary keys for Pet and Owner by default should be id (not pet_id / owner_id). Yii may be getting confused if you don't clarify that your primary keys don't match the default naming convention / aren't setup as primary keys in the database. You can specify what your primary key is in a model like this:
public function primaryKey()
{
return 'owner_id';
}
Finally, you would retrive the information like this:
$owner = Owner::model()->findByPk((int)$id);
foreach($owner->pets as $pet)
{
print $pet->name;
}

Answer 2

I know this is not exactly what you ask, but this is how I do it.
Add this item in your relations() return in Owner model :
'all_pets'=>array(self::HAS_MANY, 'Pet_Owner_Link','owner_id'),
Add this item in your relations() return in Pet_Owner_Link model :
'pet'=>array(self::BELONGS_TO, 'Pet', 'pet_id'),
Then get a pet like this
$owner->all_pets[$i]->pet;