Fixnums as Symbols Warning from collection_select

Rails 2.3.5, Ruby 1.86

I'm not really understanding this warning. I'm getting one warning for each record containted in @directories when using @directories in a collection_select. I've tried playing around with the :id instances using them differently but with no luck. I'm sure it's something simple (I'm still 开发者_开发技巧pretty new).

Thanks in Advance!

error:

C:/Ruby186/lib/ruby/gems/1.8/gems/actionpack-2.3.5/lib/action_view/helpers/form_options_helper.rb:328:

warning: do not use Fixnums as Symbols

The offending code:

<% if !params[:directory].nil? %>
  <%= collection_select :directory, :id, @directories, (:id).to_i, :name,
                      {:selected => params[:directory][:id].map{|id|id.to_i}}, {:size => 7, :multiple => true} %>
<% else %>
  <%= collection_select :directory, :id, @directories, (:id).to_i, :name,
                      {:selected => @directory_ids}, {:size => 7, :multiple => true} %>
<% end %>

You're passing in (:id).to_i as an argument to collection_select. collection_select then uses it as an argument to send. Since (:id).to_i is an integer and send being called with an integer as an argument is almost always a mistake, send emits the warning you get.

It should be noted that there is no reason to use :id.to_i instead of just :id here since the only difference between send(:symbol) and send(:symbol.to_i) is that the latter produces a warning.