Broadcasters

Example

In your model

class User < ActiveRecord::Base
  include ForeignOffice::Broadcaster
  attr_accessor :load_friend
  has_many :friendships

  def serialize
    self.attributes.merge friend_count: self.friendships.count,
      load_friend: self.load_friend
  end
end

In a service object

class AddFriend
  def init(initiator,new_friend)
    @initiator, @new_friend = initiator, new_friend
  end

  def call
    @friendship = Friendship.create(initiator: @initiator, friend: @new_friend)
    @recipient.load_friendship = @friendship
    @recipient.broadcast_change
    @new_friend.load_friendship = @friendship
    @new_friend.broadcast_change
    @friendship
  end
end

In your view

<span <%= listener_attrs(@user, :friend_count)> > <%= @user.friend_count %> </span>
<section id="friendship_list">
  <%= render partial: '/friendships/show_wrapper', collection: @user.friendships %>
</section>
<%= ajax_link '', '#', {data: listener_hash(@user, :load_friend, trigger: true)}, '#friendship_list' %>