text: Q:
  
  Helper method throws 'can't convert nil into String' in do loop on Heroku only
  
  Here is my code in my index view template:
  <% @locations.each do |location| %>
    <tr>
      <td><%= link_to formatted_uwi(location.uwi), location_path(location) %></td>
      <td><%= location.name %></td>
      <td><%= location.created_at %></td>
      <td>
        <%= link_to 'Edit', edit_location_path(location), :class => 'btn btn-mini' %>
        <%= link_to 'Destroy', location_path(location), :method => :delete, :confirm => 'Are you sure?', :class => 'btn btn-mini btn-danger' %>
      </td>
    </tr>
  <% end %>
  
  It runs fine on my local dev system but fails on Heroku in pro & dev environments.  I get: 
  "TypeError... can't convert nil into String"
  formatted_uwi is a simple helper that formats the location.uwi input.  If I call just 'location.uwi' or use an actual string in it's place it works fine and displays the raw location.uwi value so I know it's not a nil value.  I even tried location.uwi.to_s.
  Very bizarre.  I can call this helper on the show, edit and other views and it works fine.  It only fails in the do loop AND on Heroku.
  
  A:
  
  Not sure what I did but I went back trough my helper to catch the nil and it seems to work now.
  
  