ember.js - Rails-style polymorphic model in ember-data -

if have following models in rails, how represent in ember/ember data?

class attachment < activerecord::base   belongs_to :user   belongs_to :attachable, polymorphic: true end  class profile < activerecord::base   belongs_to :user   has_one :photo, class_name: 'attachment', as: :attachable end  class post < activerecord::base   belongs_to :user   has_many :attachments, as: :attachable end 

references i've found the relevant ember-data pull request, the ember-data tests polymorphic relationships, , this related question it's difficult work out canonical example them.

i use 2 different ways of working rails-style "polymorphic" models. have updated code below show both uses.

attachment model: "polymorphic" on rails side "embedded" on ember side. reason need save/update attachments along associated model.

comment model: polymorphic on both rails side , ember side.

i have included code post model can have multiple attachments , multiple comments.

---

rails code:

class attachment < activerecord::base   belongs_to :user   belongs_to :attachable, polymorphic: true end  class comment < activerecord::base   belongs_to :user   belongs_to :commentable, polymorphic: true end  class post < activerecord::base   belongs_to :user   has_many :attachments, as: :attachable   has_many :comments, as: :commentable end  class applicationserializer < activemodel::serializer   embed :ids, include: true end  class attachmentserializer < applicationserializer   attributes :id, :url, :errors   has_many :comments end  class commentserializer < applicationserializer   attributes :id, :body, :created_at, :commentable_id, :commentable_type   has_one :user end  class postserializer < applicationserializer   attributes :id, :title, :body, :posted_at, :errors   has_one :user   has_many :attachments, embed: :objects, include: true   has_many :comments end  class api::v1::postscontroller < api::v1::basecontroller   before_filter :auth_only!, only: :create    def create     # clean / capture ember-data supplied arguments     params[:post].delete(:user_id)     attachments_params = params[:post].delete(:attachments)      @post = current_user.posts.new(params[:post])     process_attachments(attachments_params)      if @post.save       render json: @post, status: 201     else       warden.custom_failure!       render json: @post, status: 422     end   end    protected      def process_attachments(attachments_params)       return unless attachments_params.present?        attachments_params.each |attachment_params|         # ignore ember-data's additional keys         attachment_params.delete(:created_at)         attachment_params.delete(:user_id)          attachment = @post.attachments.new(attachment_params)         attachment.user = current_user       end     end end 

ember code:

ds.restadapter.configure 'app.post',   alias: 'post'  ds.restadapter.map 'app.post',   attachments: { embedded: 'always' }  app.store = ds.store.extend   adapter: ds.restadapter.create     namespace: 'api/v1'  app.comment = app.model.extend   user: ds.belongsto('app.user')   commentable: ds.belongsto('app.commentable', { polymorphic: true })   body:       ds.attr('string')   createdat:  ds.attr('date')  app.commentable = app.model.extend   comments: ds.hasmany('app.comment')  app.attachment = app.commentable.extend   user: ds.belongsto('app.user')   url: ds.attr('string')  app.post = app.commentable.extend   user: ds.belongsto('app.user')   attachments: ds.hasmany('app.attachment')    title: ds.attr('string')   body: ds.attr('string')   postedat: ds.attr('date')  app.postformoverlaycontroller = app.overlaycontroller.extend   # 'files' attribute set widget wraps filepicker.io js   updateattachments: (->     attachments = @get('attachments')     attachments.clear()     @get('files').foreach (file) =>       attachment = app.attachment.createrecord({fpfile: file})       attachments.addobject(attachment)   ).observes('files')  app.commentnewcontroller = app.objectcontroller.extend   # should instantiated it's model set commentable   # item. eg. `{{render 'comment/new' content}}`    save: ->     transaction = @get('store').transaction()     comment = transaction.createrecord app.comment,       body: @get('body')       commentable: @get('model')      comment.one 'didcreate', @, ->       @set('body', null)      transaction.commit() 

unfortunately rails code has become little polluted ember-data specific oddities tries send attributes defined on models. (note: there open proposal read-only attributes solve params pollution issue)

if knows better way approach of above please let me know!

nb: i'm little concerned having models extend app.commentable prevent me having multiple polymorphic attachments on model, may need different way of handling that.