Question

I am currently developing a cart which will take the id of the CD or a DVD, it then gets the name of the item.

If I use them individually it works fine as I have made the relevant changes in the other files.

The code currently is:

<% if line_item==@current_item %>
  <tr id='current_item'>
<% else %>  
  <tr>
<% end %>
    <td><%= line_item.quantity %>&times;</td>
    <td><%= line_item.product.name %></td>
    <td><%= line_item.dvd.name %></td>

    <td class="item_price"><%= number_to_currency(line_item.total_price, :unit=>'&pound') %></td>
  </tr>

If I have a <td><%= line_item.cd.name %></td> line and only add CDs it works fine, and vice-versa with this line <td><%= line_item.dvd.name %></td>.

What I want is it to do a test to see if cd.name is nil and if it is use the dvd.name, but this is not working.

Answer 1

This should work

 line_item.cd.try(:name) || line_item.dvd.try(:name)

This code will first try to get CD name and fallback to DVD if either cd or cd.name is nil.