Rails - Feb 2007 - Check method exists for plugin

I''m writing a plugin that requires that an implementing Model has a
method called ''title'' defined.

For my init.rb, I have:

    require ''article_assignable''
    ActiveRecord::Base.send(:include, David::ArticleAssignable)

Then in article_assignable.rb:

    module David
      module ArticleAssignable
        def self.included(base)
          base.extend Plugin
        end

        module Plugin
          def article_assignable
            # Set-up polymorphic association
            has_many :assignables, :as => :object



            # Raise exception if the model doesn''t have a Title
attribute.
            # Do this by checking for the `title` method.
            raise "Requires Title method in #{self.class}" unless
respond_to?(:title)
          end
        end

      end
    end

The problem I''m getting is using `respond_to?`. It seems to be checking
`Class` rather than the Active Record model I have using:

    class Film < ActiveRecord::Base
      article_assignable
    end

Any help would be much appreciated.

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