Ember Associations

comment.js.coffee

App.Comment = DS.Model.extend(
  body: DS.attr("string")
  post: DS.belongsTo('App.Post')

  validate: ->
    if @get("body") is `undefined` or @get("body") is ""
      "Comments require a body."
)

comment_serializer.rb

class CommentSerializer < ActiveModel::Serializer
  attributes :body, :id, :post_id
end

post.js.coffee

App.Post = DS.Model.extend(
  title: DS.attr("string")
  body: DS.attr("string")
  comments: DS.hasMany('App.Comment')

  validate: ->
    if @get("title") is `undefined` or @get("title") is "" or @get("body") is `undefined` or @get("body") is ""
      "Posts require a title and body."
)

post_serializer.rb

class PostSerializer < ActiveModel::Serializer
  embed :ids, :include => true
  attributes :title, :body, :id
  has_many :comments
end