title: Laravel - Relations with multiple ids
body: <p>I have two table: 
  <br>1. <strong>Rooms</strong>
  <br>2. <strong>Facilities</strong></p>
  
  <p>The <em>Facilities</em> rooms contains the id and a varchar column. 
  <br> The <em>Room</em> table contains a columns (<em>facilities_id</em>) with, obviously, the id from the <em>facilities</em> table. In that column I have a multiple value, separated by a comma (1,3,4).</p>
  
  <p>What is the best way to make a relation between them? Like "belongsTo" relations but with multi ids.</p>