undefined method `merge' for 5:Fixnum - Hidden Field

Just a quick post on an error I ran into today while using hidden fields:

undefined method `merge' for 5:Fixnum

27:   <div class="actions">
28:      'button' %>
29:   </div>
30:   
31: 
32: 

Thankfully this is an easy fix, simply amend your code as follows:

<div class="actions">
     'button' %>
</div>
    @upload.product_id %>

And that’s all there is to it, let me know if there are any issues.