how to set a relation with empty value? - php

Question

I have 2 tables namely Equipment and Supply.
I have used array_merge in yii php to serve as union for two different tables for the purpose of diplaying them in a single grid.
Everything works fine with the fields that is common with the two tables. The problem is when I try to display a field that is only existing in one of these two tables. It says Property "Supply.equipType" is not defined" because only equipment has the equipType relation.
in my gridView:
array(
'name'=>'equipment_type',
'value'=>'$data->equipType->name',
),
in my controller where I did the merging:
$prov1 = new CActiveDataProvider('BaseEiEquipItem', array(
'criteria' => array(
'condition' => 'id>0'
)));
$prov2 = new CActiveDataProvider('BaseSiReceivedItem', array(
'criteria' => array(
'condition' => 'id>0'
)));
$records=array_merge($prov1->data , $prov2->data);
$provAll = new CArrayDataProvider($records,
array(
'sort' => array( //optional and sortring
'keyField'=>false,
'attributes' => array(
'id', 'description',),
),
'pagination' => array('pageSize' => 10) //optional add a pagination
)
);
$this->render('create',array(
'model'=>$model,
'searchModel'=>$searchModel,
'modelGrid'=>$modelGrid,
'provAll' => $provAll,
));
in my equipment model :
public function relations() {
// NOTE: you may need to adjust the relation name and the related
// class name for the relations automatically generated below.
return array(
'equipType' => array(self::BELONGS_TO, 'BaseRefEquipmentType', 'equipment_type'),
);
}
Any idea on how to solve this? Is there any way to fake a relation or something?
thanks in advance

Answer 1

Just add condition to check if equipType is there:
'value'=>'isset($data->equipType) ? $data->equipType->name : ""'
Using sql to merge results would be better, though.

Answer 2

Can't you just use plain SQL union?
If Equipment has 2 fields (a, b) and Supply has 2 fields (b, c), you can do union like this:
SELECT a, b, null FROM Equipment
UNION ALL
SELECT null, b, c FROM Supply

Answer 3

This problem shows, that it's probably not a good idea to mix different model types in one gridview. If you have a model that has no equipType then it's pretty obvious, that you can't show this column in a gridview. So what would you expect?
As a (dirty) workaround you can add all missing columns as pseudo attributes to the models where they are missing:
public $equipType;