Active Record relation and asArray()

[armpogart]

If we have Model extending from ActiveRecord, we can easily query data as array using ActiveQueryTrait asArray() modifier. But when we have relation, for example (through PivotTable):

class Order extends \yii\db\ActiveRecord
{
    public function getItems()
    {
        return $this->hasMany(Item::className(), ['id' => 'item_id'])
            ->viaTable('tbl_order_item', ['order_id' => 'id']);
    }
}

and now if we try to query data using lazy loading with asArray(), we won't have items at all. If we try to load related data using eager loading ->with('items') we will have error that we are using getDb() on non-object.

Any way to load ActiveRecord data as array and have related data in in associative array?

[qiangxue]

Of course you can't use lazy loading with asArray() because you would be operating on an array.
You should use eager loading in this case.

[armpogart]

OK, I want to use eager loading, but I get error using that approach. When I query:

$orders = Order::find()->with('items')->asArray()->all();

Without ->asArray(), everything works as expected, but why I can't load data asArray with relation?

[qiangxue]

What error did you get? What's the error call stack? How are Order and the items relation declared?

[armpogart]

Here is my case:
I have 2 ActiveRecord models Driver and Car. Driver model is related to car through Pivot Table:

public function getCars()
{
    return $this->hasMany(Car::className(), ['id' => 'car_id'])
        ->viaTable('wpta_driver_car', ['driver_id' => 'id']);
}

When I load Driver model in Controller following way:

$drivers = Driver::find()->with('cars')->all();

everything loads just fine, and I can see that cars are loaded. But when I want to load drivers with their cars as array:

$drivers = Driver::find()->with('cars')->asArray()->all();

I get error: Call to a member function getDb() on a non-object in vendor\yiisoft\yii2\yii\db\ActiveRelationTrait.php at line 250. It is the following line: return $this->asArray()->all($primaryModel->getDb());.

Why I can't load related data as array. Sometimes it's crucial for applications.

[armpogart]

Here is full screenshot of call stack:

[armpogart]

So after further investigation I've found out that there is simple fix. I've changed following function:

private function findPivotRows($primaryModels)
    {
        if (empty($primaryModels)) {
            return [];
        }
        $this->filterByModels($primaryModels);
        /** @var ActiveRecord $primaryModel */
        $primaryModel = reset($primaryModels);
        return $this->asArray()->all($primaryModel->getDb());
    }

to

private function findPivotRows($primaryModels)
    {
        if (empty($primaryModels)) {
            return [];
        }
        $this->filterByModels($primaryModels);
        /** @var ActiveRecord $primaryModel */
        $primaryModel = reset($primaryModels);
        return $this->asArray()->all();
    }

I've simply removed ->getDB() part in last line. In that case as far as I understand Yii::getDb() is used under the hood, so it may bring some problems if other than default connection was used.
This simple fix gives the exact expected result.
Sadly I can't come up with better fix without going deeper in the code, but I can do it in 2-3 days when I have some more spare time, if I can be of any help.

[armpogart]

Thanks!!!
Your team is doing fantastic job, I've learned many new things with the help of Yii 1 and now Yii 2!