Let say I have model like this ``` php class Author extends Moloquent { public function books() { return $this->embedsMany(Book::class); } } ``` And i want to query books of an Author ``` php $author = Author::find($authorId); $author->books()->where('pages', '>', 300)->get(); ``` By running the code above I get this error ``` Missing argument 1 for Illuminate\\Support\\Collection::get() ``` if I pass column array to get method, I get: ``` array_key_exists(): The first argument should be either a string or an integer ```