Josh, We're doing something similar, except that instead of using childable and parentable, we're using awesome_nested_set. It enables you to have sub_categories within sub_categories, etc., and its interface is pretty intuitive and efficient:
http://wiki.github.com/collectiveidea/awesome_nested_set/awesome-nested-set-cheat-sheet Tilde Equals On May 25, 12:29 pm, Josh Cheek <[email protected]> wrote: > Hi, seem to keep running into a wall here. I can't find any resources on > site navigation that can deal with any model being in the nav, allow > nesting, and can dynamically update. > > So I thought about it for a while, and decided on a MenuItems class, which > contained the position of the child in relation to it's siblings, where the > parent and the child were polymorphic. Then a given childable object can > find it's parentable by going through the menu_items table. > > I want my nav to be able to do things like this: > --Category1 > ----SubCategory1 > ------Product1 > ------Product2 > ----Product3 > --Category2 > ----Product4 > --Page1 > --Page2 > --Page3 > > This is the current setup: > > MODELS > > class MenuItem < ActiveRecord::Base > belongs_to :childable , :polymorphic => true > belongs_to :parentable , :polymorphic => true > > acts_as_list :scope => :parentable_id > end > > class Category < ActiveRecord::Base > has_one :parent_menu_item , :as => :parentable , :class_name => > 'MenuItem' > has_many :child_menu_items , :as => :childable , :class_name => > 'MenuItem' > > has_one :parentable , :through => :parent_menu_item > has_many :childables , :through => :child_menu_items > end > > class SubCategory < ActiveRecord::Base > has_many :child_menu_items , :as => :childable , :class_name => > 'MenuItem' > has_one :parent_menu_item , :as => :parentable , :class_name => > 'MenuItem' > > has_one :parent , :through => :parent_menu_item > has_many :children , :through => :child_menu_items > end > > class Page < ActiveRecord::Base > has_one :parent_menu_item , :as => :parentable , :class_name => > 'MenuItem' > has_one :parent , :through => :parent_menu_item > end > > SCHEMA: > ActiveRecord::Schema.define(:version => 20100525184637) do > > create_table "categories", :force => true do |t| > t.datetime "created_at", :null => false > t.datetime "updated_at", :null => false > end > > create_table "menu_items", :force => true do |t| > t.integer "position", :null => false > t.integer "parentable_id", :null => false > t.string "parentable_type", :null => false > t.integer "childable_id", :null => false > t.string "childable_class", :null => false > t.datetime "created_at", :null => false > t.datetime "updated_at", :null => false > end > > create_table "pages", :force => true do |t| > t.datetime "created_at", :null => false > t.datetime "updated_at", :null => false > end > > create_table "sub_categories", :force => true do |t| > t.datetime "created_at", :null => false > t.datetime "updated_at", :null => false > end > > end > > I have had a lot of trouble with it, this is the best I've gotten so far, > but I am still getting the error: > ActiveRecord::HasManyThroughAssociationPolymorphicError: Cannot have a > has_many :through association 'Category#childables' on the polymorphic > object 'Childable#childable'. > > Is there a way to make this work? Is there a better way to do this? -- 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 [email protected]. To unsubscribe from this group, send email to [email protected]. For more options, visit this group at http://groups.google.com/group/rubyonrails-talk?hl=en.
