title: How to join 3 tables using laravel eloquent
body: <p>How can I apply this query in laravel 5?
  I have 3 table, Post, Profile, Comments</p>
  
  <pre><code>Post{id,title,body,user_id}
  profile{user_id,last_name,first_name}
  comments{comments,user_id,post_id}
  </code></pre>
  
  <p>I want to get this kind of structure:</p>
  
  <p><code>post_id  title post  last_name  first_name</code></p>
  
  <p><em>and below are the comments</em></p>
  
  <p><code>comments  last_name   fist_name</code></p>