Bring back likes on comments

app/assets/javascripts/app/collections/likes.js

@@ -4,7 +4,10 @@ app.collections.Likes = Backbone.Collection.extend({
   model: app.models.Like,
 
   initialize : function(models, options) {
-    this.url = "/posts/" + options.post.id + "/likes"; //not delegating to post.url() because when it is in a stream collection it delegates to that url
+    this.url = (options.post != null) ?
+      // not delegating to post.url() because when it is in a stream collection it delegates to that url
+      "/posts/" + options.post.id + "/likes" :
+      "/comments/" + options.comment.id + "/likes";
   }
 });
 // @license-end

app/assets/javascripts/app/models/comment.js

@@ -1,6 +1,53 @@
 // @license magnet:?xt=urn:btih:0b31508aeb0634b347b8270c7bee4d411b5d4109&dn=agpl-3.0.txt AGPL-v3-or-Later
 
 app.models.Comment = Backbone.Model.extend({
-  urlRoot: "/comments"
+  urlRoot: "/comments",
+
+  initialize: function() {
+    this.likes = new app.collections.Likes(this.get("likes"), {comment: this});
+  },
+
+  // Copied from Post.Interaction. To be merged in an "interactable" class once comments can be commented too
+  likesCount: function() {
+    return this.get("likes_count");
+  },
+
+  userLike: function() {
+    return this.likes.select(function(like) {
+      return like.get("author") && like.get("author").guid === app.currentUser.get("guid");
+    })[0];
+  },
+
+  toggleLike: function() {
+    if (this.userLike()) {
+      this.unlike();
+    } else {
+      this.like();
+    }
+  },
+
+  like: function() {
+    var self = this;
+    this.likes.create({}, {
+      success: function() {
+        self.post.set({participation: true});
+        self.trigger("change");
+        self.set({"likes_count": self.get("likes_count") + 1});
+        self.likes.trigger("change");
+      },
+      error: function(model, response) {
+        app.flashMessages.handleAjaxError(response);
+      }
+    });
+  },
+
+  unlike: function() {
+    var self = this;
+    this.userLike().destroy({success: function() {
+      self.trigger("change");
+      self.set({"likes_count": self.get("likes_count") - 1});
+      self.likes.trigger("change");
+    }});
+  }
 });
 // @license-end

app/assets/javascripts/app/views/comment_view.js

@@ -9,7 +9,8 @@ app.views.Comment = app.views.Content.extend({
   events : function() {
     return _.extend({}, app.views.Content.prototype.events, {
       "click .comment_delete": "destroyModel",
-      "click .comment_report": "report"
+      "click .comment_report": "report",
+      "click .like": "toggleLike"
     });
   },
 
@@ -35,6 +36,11 @@ app.views.Comment = app.views.Content.extend({
 
   canRemove : function() {
     return app.currentUser.authenticated() && (this.ownComment() || this.postOwner());
+  },
+
+  toggleLike: function(evt) {
+    if (evt) { evt.preventDefault(); }
+    this.model.toggleLike();
   }
 });
 

app/assets/templates/comment_tpl.jst.hbs

@@ -36,5 +36,15 @@
     <div class="collapsible comment-content markdown-content">
       {{{text}}}
     </div>
+
+    <div class="info">
+      <a href="#" class="like" rel='nofollow'>
+        {{~#if userLike~}}
+          {{~t "stream.unlike"~}}
+        {{~else~}}
+          {{~t "stream.like"~}}
+        {{~/if~}}
+      </a>
+    </div>
   </div>
 </div>

app/controllers/likes_controller.rb

@@ -17,7 +17,11 @@ class LikesController < ApplicationController
   end
 
   def create
-    like = like_service.create(params[:post_id])
+    like = if params[:post_id]
+             like_service.create_for_post(params[:post_id])
+           else
+             like_service.create_for_comment(params[:comment_id])
+           end
   rescue ActiveRecord::RecordNotFound, ActiveRecord::RecordInvalid
     render plain: I18n.t("likes.create.error"), status: 422
   else

app/services/like_service.rb

@@ -5,11 +5,16 @@ class LikeService
     @user = user
   end
 
-  def create(post_id)
+  def create_for_post(post_id)
     post = post_service.find!(post_id)
     user.like!(post)
   end
 
+  def create_for_comment(comment_id)
+    comment = comment_service.find!(comment_id)
+    user.like!(comment)
+  end
+
   def destroy(like_id)
     like = Like.find(like_id)
     if user.owns?(like)
@@ -43,4 +48,8 @@ class LikeService
   def post_service
     @post_service ||= PostService.new(user)
   end
+
+  def comment_service
+    @comment_service ||= CommentService.new(user)
+  end
 end