Edit post works now.

lms/djangoapps/django_comment_client/forum/views.py

+import json
+import logging 
+
 from django.contrib.auth.decorators import login_required
 from django.views.decorators.http import require_POST
 from django.http import HttpResponse, Http404
@@ -15,7 +18,6 @@ from operator import methodcaller
 from django_comment_client.permissions import check_permissions_by_view
 from django_comment_client.utils import merge_dict, extract, strip_none, strip_blank, get_courseware_context
 
-import json
 import django_comment_client.utils as utils
 import comment_client as cc
 import xml.sax.saxutils as saxutils
@@ -24,6 +26,7 @@ THREADS_PER_PAGE = 200
 INLINE_THREADS_PER_PAGE = 5
 PAGES_NEARBY_DELTA = 2
 
+log = logging.getLogger("edx.discussions")
 
 def _general_discussion_id(course_id):
     return course_id.replace('/', '_').replace('.', '_')

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

+class @DiscussionThreadEditView extends Backbone.View
+
+  events:
+    "click .post-update": "update"
+    "click .post-cancel": "cancel_edit"
+
+  template: _.template($("#thread-edit-template").html())
+
+  $: (selector) ->
+    @$el.find(selector)
+
+  initialize: ->
+    super()
+
+  render: ->
+    @$el.html(@template(@model.toJSON()))
+    @delegateEvents()
+    DiscussionUtil.makeWmdEditor @$el, $.proxy(@$, @), "edit-post-body"
+    @$(".edit-post-tags").tagsInput DiscussionUtil.tagsInputOptions()
+    @
+
+  update: (event) ->
+    @trigger "thread:update", event
+
+  cancel_edit: (event) ->
+    @trigger "thread:cancel_edit", event

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

@@ -57,7 +57,6 @@ class @DiscussionThreadShowView extends DiscussionContentView
   toggleFollowing: (event) ->
     $elem = $(event.target)
     url = null
-    console.log "follow"
     if not @model.get('subscribed')
       @model.follow()
       url = @model.urlFor("follow")
@@ -113,12 +112,11 @@ class @DiscussionThreadShowView extends DiscussionContentView
         comment.updateInfo(data.annotated_content_info)
         comment.set(data.content)
 
-  edit: ->
-    @trigger "thread:edit"
-    window.showView = @
+  edit: (event) ->
+    @trigger "thread:edit", event
 
   delete: (event) ->
-    @trigger "thread:delete"
+    @trigger "thread:delete", event
 
   toggleClosed: (event) ->
     $elem = $(event.target)

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

@@ -11,18 +11,13 @@ if Backbone?
 
     initialize: ->
       super()
-      @showView = new DiscussionThreadShowView(model: @model)
-      @showView.bind "thread:delete", @delete
-      @showView.bind "thread:edit", @edit
+      @createShowView()
 
     render: ->
       @$el.html(@template(@model.toJSON()))
       @delegateEvents()
 
-      @showView.setElement(@$('.thread-content-wrapper'))
-      @showView.render()
-      @showView.delegateEvents()
-
+      @renderShowView()
       @renderAttrs()
       @$("span.timeago").timeago()
       @makeWmdEditor "reply-body"
@@ -76,15 +71,94 @@ if Backbone?
           comment.updateInfo(data.annotated_content_info)
           comment.set(data.content)
 
-    edit: ->
+    edit: (event) =>
+      @createEditView()
+      @renderEditView()
+
+    update: (event) =>
+
+      newTitle = @editView.$(".edit-post-title").val()
+      newTags  = @editView.$(".edit-post-tags").val()
+      newBody  = @editView.$(".edit-post-body textarea").val()
+
+      url = DiscussionUtil.urlFor('update_thread', @model.id)
+
+      DiscussionUtil.safeAjax
+          $elem: $(event.target)
+          $loading: $(event.target) if event
+          url: url
+          type: "POST"
+          dataType: 'json'
+          async: false # TODO when the rest of the stuff below is made to work properly..
+          data:
+              title: newTitle
+              body: newBody
+              tags: newTags
+          error: DiscussionUtil.formErrorHandler(@$(".edit-post-form-errors"))
+          success: (response, textStatus) =>
+
+              # TODO: Move this out of the callback, this makes it feel sluggish
+
+              @editView.$(".edit-post-title").val("").attr("prev-text", "")
+              @editView.$(".edit-post-body textarea").val("").attr("prev-text", "")
+              @editView.$(".edit-post-tags").val("")
+              @editView.$(".edit-post-tags").importTags("")
+              @editView.$(".wmd-preview p").html("")
+
+              @model.set
+                title: newTitle
+                body: newBody
+                tags: newTags
+
+              @createShowView()
+              @renderShowView()
+
+    createEditView: () ->
+
+      if @showView?
+        @showView.undelegateEvents()
+        @showView.$el.empty()
+        @showView = null
+
+      @editView = new DiscussionThreadEditView(model: @model)
+      @editView.bind "thread:update", @update
+      @editView.bind "thread:cancel_edit", @cancelEdit
+
+    renderEditView: () ->
+      @editView.setElement(@$('.thread-content-wrapper'))
+      @editView.render()
+      @editView.delegateEvents()
+
+    createShowView: () ->
+
+      if @editView?
+        @editView.undelegateEvents()
+        @editView.$el.empty()
+        @editView = null
+
+      @showView = new DiscussionThreadShowView(model: @model)
+      @showView.bind "thread:delete", @delete
+      @showView.bind "thread:edit", @edit
+
+    renderShowView: () ->
+      @showView.setElement(@$('.thread-content-wrapper'))
+      @showView.render()
+      @showView.delegateEvents()
+
+    cancelEdit: (event) =>
+      @createShowView()
+      @renderShowView()
+
 
-    delete: (event) ->
+    delete: (event) =>
       url = @model.urlFor('delete')
       if not @model.can('can_delete')
         return
       if not confirm "Are you sure to delete thread \"#{@model.get('title')}\"?"
         return
       @model.remove()
+      @showView.undelegateEvents()
+      @undelegateEvents()
       @$el.empty()
       $elem = $(event.target)
       DiscussionUtil.safeAjax

lms/static/sass/_discussion.scss

@@ -270,6 +270,46 @@ body.discussion {
     }
   }
 
+  .edit-post-form {
+    width: 100%;
+    margin-bottom: 20px;
+    @include clearfix;
+    .post-cancel {
+      @include white-button;
+      border-color: #444;
+      float: left;
+      margin: 10px 0 0 15px;
+    }
+
+    .post-update {
+
+      @include blue-button;
+      float: left;
+      height: 37px;
+      margin-top: 10px;
+      border-color: #333;
+      padding-bottom: 2px;
+
+      &:hover {
+        border-color: #222;
+      }
+    }
+
+    .edit-post-title, .edit-post-tags {
+      width: 100%;
+      height: 40px;
+      padding: 0 10px;
+      box-sizing: border-box;
+      border-radius: 3px;
+      border: 1px solid #333;
+      font-size: 16px;
+      font-family: 'Open Sans', sans-serif;
+      color: #333;
+      box-shadow: 0 1px 3px rgba(0, 0, 0, 0.3) inset;
+    }
+
+  }
+
   .new-post-form {
     width: 100%;
     margin-bottom: 20px;
@@ -369,14 +409,6 @@ body.discussion {
       &:hover {
         border-color: #222;
       }
-
-      .author-moderator:after{
-        content: " (moderator)"
-      }
-
-      .author-administrator:after{
-        content: " (instructor)"
-      }
     }
 
     .new-post-cancel {

lms/templates/discussion/_underscore_templates.html

@@ -50,6 +50,26 @@
   </div>
 </script>
 
+<script type="text/template" id="thread-edit-template">
+  <div class="discussion-post edit-post-form">
+    <h1>Editing post</h1>
+    <ul class="edit-post-form-errors"></ul>
+    <div class="form-row">
+      <input type="text" class="edit-post-title" name="title" value=${"<%-title %>"} placeholder="Title">
+    </div>
+    <div class="form-row">
+      <div class="edit-post-body" name="body">
+        ${"<%- body %>"}
+      </div>
+    </div>
+    <div class="form-row">
+      <input type="text" class="edit-post-tags" name="tags" placeholder="Tags" value=${"<%- tags %>"}>
+    </div>
+    <input type="submit" class="post-update" value="Update post">
+    <a href="#" class="post-cancel">Cancel</a>
+  </div>
+</script>
+
 <script type="text/template" id="thread-response-template">
     <header class="response-local">
         <a href="javascript:void(0)" class="vote-btn" data-tooltip="vote"><span class="plus-icon"></span><span class="votes-count-number">${"<%- votes['up_count'] %>"}</span></a>