Refactor likes controller using like service

app/controllers/likes_controller.rb

@@ -11,42 +11,27 @@ class LikesController < ApplicationController
              :json
 
   def create
-    begin
-      @like = if target
-        current_user.like!(target)
-      end
-    rescue ActiveRecord::RecordNotFound, ActiveRecord::RecordInvalid => e
-      # do nothing
-    end
-
-    if @like
-      respond_to do |format|
-        format.html { render :nothing => true, :status => 201 }
-        format.mobile { redirect_to post_path(@like.post_id) }
-        format.json { render :json => @like.as_api_response(:backbone), :status => 201 }
-      end
-    else
-      render text: I18n.t("likes.create.error"), status: 422
+    like = like_service.create(params[:post_id])
+  rescue ActiveRecord::RecordNotFound, ActiveRecord::RecordInvalid
+    render text: I18n.t("likes.create.error"), status: 422
+  else
+    respond_to do |format|
+      format.html { render nothing: true, status: 201 }
+      format.mobile { redirect_to post_path(like.post_id) }
+      format.json { render json: like.as_api_response(:backbone), status: 201 }
     end
   end
 
   def destroy
-    begin
-      @like = Like.find_by_id_and_author_id!(params[:id], current_user.person.id)
-    rescue ActiveRecord::RecordNotFound
+    if like_service.destroy(params[:id])
+      render nothing: true, status: 204
+    else
       render text: I18n.t("likes.destroy.error"), status: 404
-      return
-    end
-
-    current_user.retract(@like)
-    respond_to do |format|
-      format.json { render :nothing => true, :status => 204 }
     end
   end
 
-  #I can go when the old stream goes.
   def index
-    @likes = target.likes.includes(:author => :profile)
+    @likes = like_service.find_for_post(params[:post_id]).includes(author: :profile)
     @people = @likes.map(&:author)
 
     respond_to do |format|
@@ -57,13 +42,7 @@ class LikesController < ApplicationController
 
   private
 
-  def target
-    @target ||= if params[:post_id]
-      current_user.find_visible_shareable_by_id(Post, params[:post_id]) || raise(ActiveRecord::RecordNotFound.new)
-    else
-      Comment.find(params[:comment_id]).tap do |comment|
-       raise(ActiveRecord::RecordNotFound.new) unless current_user.find_visible_shareable_by_id(Post, comment.commentable_id)
-      end
-    end
+  def like_service
+    @like_service ||= LikeService.new(current_user)
   end
 end

spec/controllers/likes_controller_spec.rb

-  #   Copyright (c) 2010-2011, Diaspora Inc.  This file is
+#   Copyright (c) 2010-2011, Diaspora Inc.  This file is
 #   licensed under the Affero General Public License version 3 or later.  See
 #   the COPYRIGHT file.
 
-describe LikesController, :type => :controller do
+describe LikesController, type: :controller do
   before do
     @alices_aspect = alice.aspects.where(:name => "generic").first
     @bobs_aspect = bob.aspects.where(:name => "generic").first
@@ -10,137 +10,114 @@ describe LikesController, :type => :controller do
     sign_in(alice, scope: :user)
   end
 
-  [Comment, Post].each do |class_const|
-    context class_const.to_s do
-        let(:id_field){
-          "#{class_const.to_s.underscore}_id"
-        }
-
-      describe '#create' do
-        let(:like_hash) {
-          {:positive => 1,
-           id_field => "#{@target.id}"}
-        }
-        let(:dislike_hash) {
-          {:positive => 0,
-           id_field => "#{@target.id}"}
-        }
-
-        context "on my own post" do
-          it 'succeeds' do
-            @target = alice.post :status_message, :text => "AWESOME", :to => @alices_aspect.id
-            @target = alice.comment!(@target, "hey") if class_const == Comment
-            post :create, like_hash.merge(:format => :json)
-            expect(response.code).to eq('201')
-          end
-        end
-
-        context "on a post from a contact" do
-          before do
-            @target = bob.post(:status_message, :text => "AWESOME", :to => @bobs_aspect.id)
-            @target = bob.comment!(@target, "hey") if class_const == Comment
-          end
-
-          it 'likes' do
-            post :create, like_hash
-            expect(response.code).to eq('201')
-          end
-
-          it 'dislikes' do
-            post :create, dislike_hash
-            expect(response.code).to eq('201')
-          end
-
-          it "doesn't post multiple times" do
-            alice.like!(@target)
-            post :create, dislike_hash
-            expect(response.code).to eq('422')
-          end
-        end
-
-        context "on a post from a stranger" do
-          before do
-            @target = eve.post :status_message, :text => "AWESOME", :to => eve.aspects.first.id
-            @target = eve.comment!(@target, "hey") if class_const == Comment
-          end
-
-          it "doesn't post" do
-            expect(alice).not_to receive(:like!)
-            post :create, like_hash
-            expect(response.code).to eq('422')
-          end
-        end
-
-        context "when an the exception is raised" do
-          before do
-            @target = alice.post :status_message, :text => "AWESOME", :to => @alices_aspect.id
-            @target = alice.comment!(@target, "hey") if class_const == Comment
-          end
-
-          it "should be catched when it means that the target is not found" do
-            params = like_hash.merge(format: :json, id_field => -1)
-            post :create, params
-            expect(response.code).to eq('422')
-          end
-
-          it "should not be catched when it is unexpected" do
-            @target = alice.post :status_message, :text => "AWESOME", :to => @alices_aspect.id
-            @target = alice.comment!(@target, "hey") if class_const == Comment
-            allow(alice).to receive(:like!).and_raise("something")
-            allow(@controller).to receive(:current_user).and_return(alice)
-            expect { post :create, like_hash.merge(:format => :json) }.to raise_error("something")
-          end
-        end
+  describe "#create" do
+    let(:like_hash) {
+      {post_id: @target.id}
+    }
+
+    context "on my own post" do
+      it "succeeds" do
+        @target = alice.post :status_message, text: "AWESOME", to: @alices_aspect.id
+        post :create, like_hash.merge(format: :json)
+        expect(response.code).to eq("201")
       end
+    end
+
+    context "on a post from a contact" do
+      before do
+        @target = bob.post(:status_message, text: "AWESOME", to: @bobs_aspect.id)
+      end
+
+      it "likes" do
+        post :create, like_hash
+        expect(response.code).to eq("201")
+      end
+
+      it "doesn't post multiple times" do
+        alice.like!(@target)
+        post :create, like_hash
+        expect(response.code).to eq("422")
+      end
+    end
 
-      describe '#index' do
-        before do
-          @message = alice.post(:status_message, :text => "hey", :to => @alices_aspect.id)
-          @message = alice.comment!(@message, "hey") if class_const == Comment
-        end
-
-        it 'returns a 404 for a post not visible to the user' do
-          sign_in eve
-          expect{get :index, id_field => @message.id}.to raise_error(ActiveRecord::RecordNotFound)
-        end
-
-        it 'returns an array of likes for a post' do
-          like = bob.like!(@message)
-          get :index, id_field => @message.id
-          expect(assigns[:likes].map(&:id)).to eq(@message.likes.map(&:id))
-        end
-
-        it 'returns an empty array for a post with no likes' do
-          get :index, id_field => @message.id
-          expect(assigns[:likes]).to eq([])
-        end
+    context "on a post from a stranger" do
+      before do
+        @target = eve.post :status_message, text: "AWESOME", to: eve.aspects.first.id
       end
 
-      describe '#destroy' do
-        before do
-          @message = bob.post(:status_message, :text => "hey", :to => @alices_aspect.id)
-          @message = bob.comment!(@message, "hey") if class_const == Comment
-          @like = alice.like!(@message)
-        end
-
-        it 'lets a user destroy their like' do
-          current_user = controller.send(:current_user)
-          expect(current_user).to receive(:retract).with(@like)
-
-          delete :destroy, :format => :json, id_field => @like.target_id, :id => @like.id
-          expect(response.status).to eq(204)
-        end
-
-        it 'does not let a user destroy other likes' do
-          like2 = eve.like!(@message)
-          like_count = Like.count
-
-          delete :destroy, :format => :json, id_field => like2.target_id, :id => like2.id
-          expect(response.status).to eq(404)
-          expect(response.body).to eq(I18n.t("likes.destroy.error"))
-          expect(Like.count).to eq(like_count)
-        end
+      it "doesn't post" do
+        expect(alice).not_to receive(:like!)
+        post :create, like_hash
+        expect(response.code).to eq("422")
       end
     end
+
+    context "when an the exception is raised" do
+      before do
+        @target = alice.post :status_message, text: "AWESOME", to: @alices_aspect.id
+      end
+
+      it "should be catched when it means that the target is not found" do
+        params = like_hash.merge(format: :json, post_id: -1)
+        post :create, params
+        expect(response.code).to eq("422")
+      end
+
+      it "should not be catched when it is unexpected" do
+        @target = alice.post :status_message, text: "AWESOME", to: @alices_aspect.id
+        allow(alice).to receive(:like!).and_raise("something")
+        allow(@controller).to receive(:current_user).and_return(alice)
+        expect { post :create, like_hash.merge(format: :json) }.to raise_error("something")
+      end
+    end
+  end
+
+  describe "#index" do
+    before do
+      @message = alice.post(:status_message, text: "hey", to: @alices_aspect.id)
+    end
+
+    it "returns a 404 for a post not visible to the user" do
+      sign_in eve
+      expect {
+        get :index, post_id: @message.id
+      }.to raise_error(ActiveRecord::RecordNotFound)
+    end
+
+    it "returns an array of likes for a post" do
+      bob.like!(@message)
+      get :index, post_id: @message.id
+      expect(assigns[:likes].map(&:id)).to eq(@message.likes.map(&:id))
+    end
+
+    it "returns an empty array for a post with no likes" do
+      get :index, post_id: @message.id
+      expect(assigns[:likes]).to eq([])
+    end
+  end
+
+  describe "#destroy" do
+    before do
+      @message = bob.post(:status_message, text: "hey", to: @alices_aspect.id)
+      @like = alice.like!(@message)
+    end
+
+    it "lets a user destroy their like" do
+      current_user = controller.send(:current_user)
+      expect(current_user).to receive(:retract).with(@like)
+
+      delete :destroy, format: :json, post_id: @message.id, id: @like.id
+      expect(response.status).to eq(204)
+    end
+
+    it "does not let a user destroy other likes" do
+      like2 = eve.like!(@message)
+      like_count = Like.count
+
+      delete :destroy, format: :json, post_id: @message.id, id: like2.id
+      expect(response.status).to eq(404)
+      expect(response.body).to eq(I18n.t("likes.destroy.error"))
+      expect(Like.count).to eq(like_count)
+    end
   end
 end