Ember multiple polymorphic association same model

I have the following model in rails. what will be it's equivalent in Ember?

User.rb
  has_many :posted_posts, class_name: 'Post', as: :posted
  has_many :received_posts, class_name: 'Post', as: :received

Group.rb
  has_many :posted_posts, class_name: 'Post', as: :posted
  has_many :received_posts, class_name: 'Post', as: :received

Post.rb
  belongs_to :posted, polymorphic: true
  belongs_to :received, polymorphic: true