I had a question regarding one-one relationship mapping in Yii.I’ve read about the four relationships HAS_ONE,HAS_MANY,BELONGS_TO and MANY_MANY. Please correct if I am wrong about this. Suppose a model ‘User’ has a one-one relationship with model ‘Profile’. I wish to access the relationship bi-directionally. For this to work, I would have to do the following:
1.Define a foreign key ‘fk_user’ in ‘tbl_profile’ referencing ‘tbl_user’.
2.Define a foreign key ‘fk_profile’ in ‘tbl_user’ referencing ‘tbl_profile’.
3.Define relation in ‘User’ model as :
public function relations()
{
'profile' => array(self::HAS_ONE, 'Profile', 'profile_id'),
}
4.Define relation in ‘Profile’ model as:
public function relations()
{
'user' => array(self::BELONGS_TO, 'User', 'user_id'),
}
I should be able to access the fields as:
$someUser->profile->fieldX
and
$someProfile->user->fieldY
So far I’ve only used the HAS_MANY/BELONGS TO-pair but HAS_ONE/BELONGS TO should work the same way. (Of course HAS_ONE will return just a single model).
Thus, If I understood this correct you should have user_id as FK in the profile relationship (in the User model).
Thanks for the quick reply.The ‘user_id’ is a FK in ‘Profile’ model referencing ‘User’ model.I tried the HAS_ONE-BELONGS_TO combination and it worked for bi-directional access of the relationship.Just to point out, I didn’t define a FK in ‘User’ model.FK is defined only in ‘Profile’ model with the relation as HAS_ONE in ‘User’ model and ‘BELONGS_TO’ in ‘Profile’ model.Below are the relation functions.
User model:
public function relations()
{
return array(
'profile' => array(self::HAS_ONE, 'Profile', 'user_id'),
);
}
Profile model:
public function relations()
{
return array(
'user' => array(self::BELONGS_TO, 'User', 'user_id'),
);
}
Though this worked, please confirm if it is the correct way to handle a one-one relationship with bi-directional access.
