Hook up comment counts

lms/static/coffee/src/discussion/models/discussion_user.coffee

-class @DiscussionUser
-    constructor: (content_info) ->
-        @content_info = content_info
-
+class @DiscussionUser extends Backbone.Model
     following: (thread) ->
-        _.include(@content_info['subscribed_thread_ids'], thread.id)
+        _.include(@get('subscribed_thread_ids'), thread.id)
 
     voted: (thread) ->
-        _.include(@content_info['upvoted_ids'], thread.id)
+        _.include(@get('upvoted_ids'), thread.id)

lms/static/coffee/src/discussion/views/discussion_thread_view.coffee

@@ -28,9 +28,13 @@ class @DiscussionThreadView extends Backbone.View
 
   renderResponse: (response) =>
       view = new ThreadResponseView(model: response)
+      view.on "comment:add", @addComment
       view.render()
       @$(".responses").append(view.el)
 
+  addComment: =>
+    @model.trigger "comment:add"
+
   toggleVote: ->
     @$(".vote-btn").toggleClass("is-cast")
     if @$(".vote-btn").hasClass("is-cast")

lms/static/coffee/src/discussion/views/thread_list_item_view.coffee

@@ -7,6 +7,7 @@ class @ThreadListItemView extends Backbone.View
     @model.on "change", @render
     @model.on "thread:follow", @follow
     @model.on "thread:unfollow", @unfollow
+    @model.on "comment:add", @addComment
   render: =>
     @$el.html(@template(@model.toJSON()))
     if window.user.following(@model)
@@ -19,3 +20,5 @@ class @ThreadListItemView extends Backbone.View
     @$("a").addClass("followed")
   unfollow: =>
     @$("a").removeClass("followed")
+  addComment: =>
+    @$(".comments-count").html(parseInt(@$(".comments-count").html()) + 1)

lms/static/coffee/src/discussion/views/thread_response_view.coffee

@@ -3,6 +3,8 @@ class @ThreadResponseView extends Backbone.View
   template: _.template($("#thread-response-template").html())
   events:
       "click .vote-btn": "toggleVote"
+      "submit form": "submitComment"
+
   render: ->
     @$el.html(@template(@model.toJSON()))
     if window.user.voted(@model)
@@ -48,3 +50,19 @@ class @ThreadResponseView extends Backbone.View
       success: (response, textStatus) =>
         if textStatus == 'success'
           @model.set(response)
+
+  submitComment: ->
+    url = @model.urlFor('reply')
+    body = @$(".comment-form-input").val()
+    comment = new Comment(body: body, created_at: (new Date()).toISOString(), username: window.user.get("username"))
+    @renderComment(comment)
+    @trigger "comment:add"
+
+    DiscussionUtil.safeAjax
+      $elem: $(event.target)
+      url: url
+      type: "POST"
+      dataType: 'json'
+      data:
+        body: body
+    false