DC DG; added LastThreeComments decorator so we don't have to load those comments when not needed (i.e. new profile pages)

app/assets/javascripts/app/views/publisher_view.js

@@ -39,7 +39,6 @@ app.views.Publisher = Backbone.View.extend({
           $(app.publisher.el).trigger('ajax:success');
         }
         if(app.stream) {
-          statusMessage.set({"user_participation": new app.models.Participation});
           app.stream.items.add(statusMessage.toJSON());
         }
       }

app/controllers/people_controller.rb

@@ -127,7 +127,7 @@ class PeopleController < ApplicationController
         end
       end
 
-      format.json { render :json => PostPresenter.collection_json(@stream.stream_posts, current_user) }
+      format.json { render :json => @stream.stream_posts.map { |p| LastThreeCommentsDecorator.new(PostPresenter.new(p, current_user)) }}
     end
   end
 

app/controllers/streams_controller.rb

@@ -65,7 +65,7 @@ class StreamsController < ApplicationController
     respond_with do |format|
       format.html { render 'layouts/main_stream' }
       format.mobile { render 'layouts/main_stream' }
-      format.json { render :json => PostPresenter.collection_json(@stream.stream_posts, current_user) }
+      format.json { render :json => @stream.stream_posts.map {|p| LastThreeCommentsDecorator.new(PostPresenter.new(p, current_user)) }}
     end
   end
 

app/models/post.rb

@@ -14,8 +14,7 @@ class Post < ActiveRecord::Base
 
   has_many :participations, :dependent => :delete_all, :as => :target
 
-  attr_accessor :user_like,
-                :user_participation
+  attr_accessor :user_like
 
   xml_attr :provider_display_name
 

app/presenters/last_three_comments_decorator.rb

@@ -0,0 +1,9 @@
+class LastThreeCommentsDecorator
+  def initialize(presenter)
+    @presenter = presenter
+  end
+
+  def as_json(options={})
+    @presenter.as_json.merge({:last_three_comments => CommentPresenter.as_collection(@presenter.post.last_three_comments)})
+  end
+end

app/presenters/post_presenter.rb

@@ -27,9 +27,8 @@ class PostPresenter
         :post_type => @post.post_type,
         :image_url => @post.image_url,
         :object_url => @post.object_url,
-        :nsfw => @post.nsfw,
         :favorite => @post.favorite,
-        :last_three_comments => CommentPresenter.as_collection(@post.last_three_comments),
+        :nsfw => @post.nsfw,
         :author => @post.author.as_api_response(:backbone),
         :o_embed_cache => @post.o_embed_cache.try(:as_api_response, :backbone),
         :mentioned_people => @post.mentioned_people.as_api_response(:backbone),
@@ -40,8 +39,7 @@ class PostPresenter
         :next_post => next_post_path,
         :previous_post => previous_post_path,
         :user_like => user_like,
-        :user_participation => user_participation,
-        :user_reshare => user_reshare,
+        :user_reshare => user_reshare
     }
   end
 
@@ -53,18 +51,6 @@ class PostPresenter
     Rails.application.routes.url_helpers.previous_post_path(@post)
   end
 
-  def user_like
-    @post.like_for(@current_user).try(:as_api_response, :backbone)
-  end
-
-  def user_participation
-    @post.participation_for(@current_user).try(:as_api_response, :backbone)
-  end
-
-  def user_reshare
-    @post.reshare_for(@current_user)
-  end
-
   def title
     @post.text.present? ? @post.text(:plain_text => true) : I18n.translate('posts.presenter.title', :name => @post.author.name)
   end
@@ -77,6 +63,14 @@ class PostPresenter
     PostPresenter.new(@post.root, current_user).as_json if @post.respond_to?(:root)
   end
 
+  def user_like
+    @post.like_for(@current_user).try(:as_api_response, :backbone)
+  end
+
+  def user_reshare
+    @post.reshare_for(@current_user)
+  end
+
   protected
 
   def person

lib/stream/base.rb

@@ -40,7 +40,6 @@ class Stream::Base
   def stream_posts
     self.posts.for_a_stream(max_time, order, self.user).tap do |posts|
       like_posts_for_stream!(posts) #some sql person could probably do this with joins.
-      participation_posts_for_stream!(posts)
     end
   end
 
@@ -113,22 +112,6 @@ class Stream::Base
     end
   end
 
-  # @return [void]
-  def participation_posts_for_stream!(posts)
-    return posts unless @user
-
-    participations = Participation.where(:author_id => @user.person.id, :target_id => posts.map(&:id), :target_type => "Post")
-
-    participation_hash = participations.inject({}) do |hash, participation|
-      hash[participation.target_id] = participation
-      hash
-    end
-
-    posts.each do |post|
-      post.user_participation = participation_hash[post.id]
-    end
-  end
-
   # @return [Hash]
   def publisher_opts
     {}

spec/lib/stream/base_spec.rb

@@ -16,7 +16,6 @@ describe Stream::Base do
       posts = mock
       @stream.stub(:posts).and_return(posts)
       @stream.stub(:like_posts_for_stream!)
-      @stream.stub(:participation_posts_for_stream!)
 
       posts.should_receive(:for_a_stream).with(anything, anything, alice).and_return(posts)
       @stream.stream_posts

spec/presenters/post_presenter_spec.rb

@@ -43,17 +43,6 @@ describe PostPresenter do
     end
   end
 
-  describe '#user_participation' do
-    it 'includes the users participation' do
-      bob.participate!(@sm)
-      @presenter.user_participation.should be_present
-    end
-
-    it 'is nil if the user is not authenticated' do
-      @unauthenticated_presenter.user_participation.should be_nil
-    end
-  end
-
   describe '#next_post_path' do
     it 'returns a string of the users next post' do
       @presenter.next_post_path.should == "#{Rails.application.routes.url_helpers.post_path(@sm)}/next"