Array.count works fine locally, but breaks on geroku

Question

Right now, if I go to the index action of the model that I have, I am not showing the main data table that rails generates for me if there are no existing records in the database. I am doing something like:

<% if @my_records.count > 0 %>
<table>
  <tr>
    <th>...</th>
    <th>...</th>
    <th>...</th>
    <th>etc</th>
  </tr>
  <% @my_records.each do |my_record| %>
  <tr>
    <td><%=h my_record.etc %></td>
    <td><%=h my_record.etc %></td>
    <td><%=h my_record.etc %></td>
    <td><%=h my_record.etc %></td>
  </tr>
  <% end %>
</table>
<% end %>

It works locally. However, when I click my application on the hero, it causes a 500 error, and the log says: ActionView::TemplateError (undefined method 'count' for []:Array) on line ...

So I change it to .length, and it works great. Can someone tell me why this is so? Someone told me that they are redundant and the rails are spared .count, but I realized that .length- this is a function Arraythat tells you how many elements are in Arrayand .countthere was a ActiveRecordmethod for determining the number of elements in an array - these are the actual records in the database.

- ?

Answer 1

, . , , 1,8,7, 1,8,6. Enumerable#count 1.8.7: http://ruby-doc.org/core-1.8.6/classes/Enumerable.html http://ruby-doc.org/core-1.8.7/classes/Enumerable.html.