I think this is best described with an example.
class Book extends \yii\db\ActiveRecord
{
}
class Author extends yii\db\ActiveRecord
{
public function getBooks()
{
return $this->hasMany(Book::className(), ['author_id' => 'id']);
}
public function getBookCount()
{
return $this->getBooks()->count();
}
}
$query = Author::find()
->orderBy(<img src='http://www.yiiframework.com/forum/public/style_emoticons/default/huh.gif' class='bbc_emoticon' alt='???' />);
As you can see, I want to return the Author models sorted by the number of books. Given the above, how do I create the query using ActiveQuery? I realize this can be done by joining tables, but I am wondering if this can be done using ActiveRecord relations.
In Yii1 this could be done using a STAT relation and with and together, but something similar in Yii2 doesn’t seem to work.
I tried something like this, but the Books relation is not joined with the query. I believe how Yii2 does it is by getting the IDs required and then running a separate query to fulfill the relation.
$query = Author::find()
->with('books')
->orderBy(['COUNT(books.id)' => SORT_DESC]);
Ideally I would like to be able to do something like this:
$query = Author::find()
->with('bookCount')
->orderBy(['bookCount' => SORT_DESC]);