Rails - Aug 2006 - Creating a comments system for multiple types of

It sounds like you want a polymorphic association - 

class Party < ActiveRecord::Base
  has_many :comments, :as => :commentable
end

class BlogEntry < ActiveRecord::Base
  has_many :comments, :as => :commentable
end

class Comment < ActiveRecord::Base
  belongs_to :commentable, :polymorphic => true
end

then include columns ''commentable_id'' and
''commentable_type'' in the comments table, and
ActiveRecord will do lookups based on both the foreign
key and type.

Cheers,
B Gates


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