confused about viaTable()

[xchl]

What steps will reproduce the problem?

for example I have three tables. order , item , order_item

Class Order extends ActiveRecord
{
    public function getItems()
    {
        return $this->hasMany(Item::className(), ['id' => 'item_id'])
            ->viaTable('order_item', ['order_id' => 'id']);
    }
}
Order::findOne(1)

The querys
1.select * from order where id=1;
2.select * from order_item where order_id = 1;(empty result)
3.select * from item where 0=1; (why have this? );
I looked the source code

What is the expected result?

What do you get instead?

Additional info

Q	A
Yii version	2.0.5
PHP version	7.1.9
Operating system

[cebe]

3.select * from item where 0=1; (why have this? );

the condition in where could be much more complex than in your case, it is not easily possible for Yii to figure out whether a query result will be empty, so we build a query and let the database decide.

It might be possible to optimize this in some way though.

[rob006]

Can you check this with last version of Yii? In 2.0.11 support for emulateExecution was added, which should avoid such dummy queries.