Rails - Feb 2008 - Returning 'column' objects like content_columns does

I''m working on my first rails project after having gone through quite a
bit of Ruby on Rails/Up and Running.

I have a model ''Configuration''.

In the view that got scaffolded for me (I''m still back on rails version
1.2.3) I have a list.rhtml that looks like this

  <table>
    <tr>
    <% for column in Configuration.content_columns %>
      <th><%= column.human_name %></th> 
    <% end %>
    </tr>
  
  <% for configuration in @configurations %>
    <tr>
    <% for column in Configuration.content_columns %>
      <td><%=h configuration.send(column.name) %></td> 
    <% end %>

   [ snip ... ]



My Configuration table has many columns, and in the list view, I''d just
like to show the ''important'' columns. Initially in my model I
defined

  class Configuration < ActiveRecord::Base
      def self.important_columns
          return [ :description, :rate, :duration, :host]
      end
  end
       
This didn''t work, but I realized I''m returning strings, not
objects. I modified the view to be

  <% for column in Configuration.important_columns %>
    <td><%=h configuration.send(column) %></td> 
  <% end %>

But I now no longer have access to human_name for the titles. How can I get
access to the column objects, knowing their names?

I thought I could perhaps figure this out by myself if I could find the source
code for content_columns, but I couldn''t find it, any hints on how I
might have accomplished that?

TIA,

Leonard



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> I''m working on my first rails project after having gone through
quite a bit of Ruby on Rails/Up and Running.
.....
> But I now no longer have access to human_name for the titles. How can I get
access to the column objects, knowing their names?
>
> I thought I could perhaps figure this out by myself if I could find the 
> source code for content_columns, but I couldn''t find it, any hints
on
> how I might have accomplished that?
Look in the API docs for "content_columns".  Then click the
"source" link
to see the method definition.  For 1.2.5 it''s this:

      # File vendor/rails/activerecord/lib/active_record/base.rb, line 781
781:       def content_columns
782:         @content_columns ||= columns.reject { |c| c.primary || c.name =~
/(_id|_count)$/ || c.name == inheritance_column }
783:       end

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