Question

This is the table for the model:

CREATE TABLE IF NOT EXISTS `SomeModel` (  
  `id` int NOT NULL AUTO_INCREMENT,  
  `parent_id` int NOT NULL
)  

My goal is to be able to query a model with its siblings using:

SomeModel::model()->with('siblings')->findByPk($id);

Here is my current attempt at the relation:

public function relations()
{
    return array(
        'siblings' => array(self::HAS_MANY, 'SomeModel', array('parent_id'=>'parent_id')),
    );
}

The problem is that I can’t find a way to create a condition so that the model itself isn’t returned along with it’s siblings in the $model->siblings array.

Any thoughts would be great.

Thanks!

Answer 1

Change your relation to this:

'siblings'=>array(self::HAS_MANY, 'Address', array('parent_id'=>'parent_id'),'condition'=>'siblings.id!=t.id')

Edit: Some explanation, in the documentation for relation(), we can specify extra options for the join that takes place and these additional options:

Additional options may be specified as name-value pairs in the rest array elements.

Plus the default alias for the table is t hence use t.id.

Edit: from the comments:

Implementing lazy loading, the way you want it, will be tough to accomplish(I don’t know how, not sure if possible either), however i can suggest making the current code better, by

1. using named scopes, use a scope when you are doing eager loading, and add the condition siblings.id!=t.id in the scope:

   // add this function to your model, and remove the condition from the relation
   public function scopes(){
    return array(
       'eagerSibs'=>array(
           'condition'=>'siblings.id!=t.id',
       ),
    );
   }
   

   Do eager loading with scope:

   SomeModel::model()->eagerSibs()->with('siblings')->findByPk($id);
   

   This will remove the error with lazy loading $model->siblings

2. Although the error of lazy loading will be removed you will still be getting the current record, to counter that you can add and use a function of the model which will load the related records without the current one, but ofcourse you won’t be using $model->siblings, and instead have something like: $model->getLazySibs();

   public function getLazySibs(){
       $sibs=$this->siblings;
       foreach ($sibs as $asib){
           if ($asib->id != $this->id)
               $lazySibs[]=$asib;
       }
       return $lazySibs;
   }