title: undefined method `merge' for 2:Fixnum
body: <p>i get the following error </p>
  
  <p>undefined method `merge' for 2:Fixnum</p>
  
  <p>for the code </p>
  
  <pre><code>f.check_box "page[group_ids][]", g.id
  </code></pre>
  
  <p>please, suggest solution for this.</p>
  
  <p>thanks</p>