New Exporter::OthersRelayables class

This class implements methods that allow to query relayables (comments, likes, participations,
poll_participations) of other people for posts of the given person.

app/models/poll_participation.rb

@@ -6,6 +6,7 @@ class PollParticipation < ActiveRecord::Base
 
   belongs_to :poll
   belongs_to :poll_answer, counter_cache: :vote_count
+  has_one :status_message, through: :poll
 
   has_one :signature, class_name: "PollParticipationSignature", dependent: :delete
 

lib/diaspora/exporter/others_relayables.rb

@@ -0,0 +1,42 @@
+module Diaspora
+  class Exporter
+    # This class implements methods that allow to query relayables (comments, likes, participations,
+    # poll_participations) of other people for posts of the given person.
+    class OthersRelayables
+      # @param person_id [Integer] Database id of a person for whom we want to request relayalbes
+      def initialize(person_id)
+        @person_id = person_id
+      end
+
+      # Comments of other people to the person's post
+      # @return [Comment::ActiveRecord_Relation]
+      def comments
+        Comment
+          .where.not(author_id: person_id)
+          .joins("INNER JOIN posts ON (commentable_type = 'Post' AND posts.id = commentable_id)")
+          .where("posts.author_id = ?", person_id)
+      end
+
+      # Likes of other people to the person's post
+      # @return [Like::ActiveRecord_Relation]
+      def likes
+        Like
+          .where.not(author_id: person_id)
+          .joins("INNER JOIN posts ON (target_type = 'Post' AND posts.id = target_id)")
+          .where("posts.author_id = ?", person_id)
+      end
+
+      # Poll participations of other people to the person's polls
+      # @return [PollParticipation::ActiveRecord_Relation]
+      def poll_participations
+        PollParticipation
+          .where.not(author_id: person_id).joins(:status_message)
+          .where("posts.author_id = ?", person_id)
+      end
+
+      private
+
+      attr_reader :person_id
+    end
+  end
+end

spec/lib/diaspora/exporter/others_relayables_spec.rb

@@ -0,0 +1,35 @@
+describe Diaspora::Exporter::OthersRelayables do
+  let(:status_message) { FactoryGirl.create(:status_message) }
+  let(:person) { status_message.author }
+  let(:instance) { Diaspora::Exporter::OthersRelayables.new(person.id) }
+
+  describe "#comments" do
+    let(:comment) { FactoryGirl.create(:comment, post: status_message) }
+
+    it "has a comment in the data set" do
+      expect(instance.comments).to eq([comment])
+    end
+  end
+
+  describe "#likes" do
+    let(:like) { FactoryGirl.create(:like, target: status_message) }
+
+    it "has a like in the data set" do
+      expect(instance.likes).to eq([like])
+    end
+  end
+
+  describe "#poll_participations" do
+    let(:status_message) { FactoryGirl.create(:status_message_with_poll) }
+    let(:poll_participation) {
+      FactoryGirl.create(
+        :poll_participation,
+        poll_answer: status_message.poll.poll_answers.first
+      )
+    }
+
+    it "has a poll participation in the data set" do
+      expect(instance.poll_participations).to eq([poll_participation])
+    end
+  end
+end