I'm still struggling with the self reference. I *THINK* I'm getting close. I have the following tables:
class CreateCategories < ActiveRecord::Migration def self.up create_table :categories do |t| t.string :name, :limit => 40 t.timestamps end end end class CreateRelationships < ActiveRecord::Migration def self.up create_table :relationships, :id => false do |t| t.integer :category_id t.integer :parent_id t.integer :sort_order t.timestamps end end end My models look like this: class Relationship < ActiveRecord::Base belongs_to :category, :class_name => 'Category', :foreign_key => 'category_id' belongs_to :parent, :class_name => 'Category', :foreign_key => 'parent_id end class Category < ActiveRecord::Base has_many :relationships, :foreign_key => 'category_id' has_many :parents, :class_name => 'Category', :through => 'relationships', :source => :parent has_many :children, :class_name => 'Category', :through => 'relationships', :source => :category end I can create a category. When I try to add a parent to it (e.g. c.parents << p) I get the error ActiveRecord::HasManyThroughAssociationNotFoundError: Could not find the association "relationships" in model Category I'm sure that I'm missing something simple, but I don't see it. Can anyone let me know what I'm missing? Thanks much ---Michael -- Posted via http://www.ruby-forum.com/. -- You received this message because you are subscribed to the Google Groups "Ruby on Rails: Talk" group. To post to this group, send email to rubyonrails-t...@googlegroups.com. To unsubscribe from this group, send email to rubyonrails-talk+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/rubyonrails-talk?hl=en.