I have in my DataBase a table with two primary keys (id and language_id) and I need put it in my models. The default primaryKey in Models (Model.php in Laravel 5) is id, and I want that the primaryKeys will be id and id_language. I tried put it with arrays or a String with ',' but it doesn't work. It says me that the array could not be converted in String.
You can't. Eloquent doesn't support composite primary keys.