title: Relation belongs to table with double primary key in Laravel
body: <p>I need to store in a database the weekly hour of an user. For example, the user A work at monday from 8:00am to 17:00pm, on tuesday from 9:00am to 11:00am ecc...</p>
  
  <p>For do this I created two table:
  Users (id, username, ecc...)
  Hours (user_id, day, start, end) with "user_id" and "day" as primary key.</p>
  
  <p>Instead of create another table called Days with only 7 records (one for each day).
  My problem is to define the relation with laravel, indeed if I use three tables I can use Many to Many relation, but if I use this form how I can specific that "day" column is a key?</p>