notify node owner for new answer

For node of type Post and Tracker, notify the owner of new
answers (in existing thread or new thread).

Currently only limited to Post and Tracker as they are the only one
shown in the dashboard.

Author: Trim

app/models/comment.rb

@@ -31,6 +31,11 @@ class Comment < ActiveRecord::Base
   scope :under,        ->(path) { where("materialized_path LIKE ?", "#{path}_%") }
   scope :published,    -> { where(state: 'published') }
   scope :on_dashboard, -> { published.order(created_at: :desc) }
+  scope :last_published, -> {
+    published.
+    order(created_at: :desc).
+    limit(1)
+  }
   scope :footer,       -> {
     # MariaDB tries to scan nodes first, which is a very slow, so we add an index hint
     from("comments USE INDEX (index_comments_on_state_and_created_at)").published.
@@ -139,6 +144,15 @@ def notify_parents
     end
   end
 
+  after_create :notify_node_owner
+  def notify_node_owner
+    # Only notify for node types shown in dashboard
+    if Set['Post', 'Tracker'].include?(content_type) and user_id != node.user_id 
+      node_owner = node.user.try(:account)
+      node_owner.notify_answer_on node_id if node_owner
+    end
+  end
+
 ### Calculations ###
 
   before_validation :default_score, on: :create

app/models/node.rb

@@ -106,6 +106,10 @@ def threads
     @threads ||= Threads.all(self.id)
   end
 
+  def last_answer
+    comments.last_published.first
+  end
+
 ### Readings ###
 
   def self.readings_keys_of(account_id)

app/views/dashboard/_posts.html.haml

@@ -8,14 +8,20 @@
     %tr
       %th Forum
       %th Sujet
+      %th Date
       %th Note
-      %th Nombre de commentaires
-      %th Date du message
+      %th <abbr title="Nombre de réponses">Rép.</abbr>
+      %th Dernière réponse
     - @posts.each do |node|
       - post = node.content
+      - answer = node.last_answer
       %tr
         %td= post.forum.title
         %td= link_to post.title, [post.forum, post]
-        %td.number= node.score
-        %td.number= node.comments.count
         %td.date= post.created_at.to_s(:posted)
+        %td.number= node.score
+        %td.number
+          - if answer && !answer.read_by?(current_account)
+            = image_tag "/images/icones/comment.png", alt: "Nouveaux commentaires !", class: "thread-new-comments"
+          = node.comments.count
+        %td.date= answer ? answer.created_at.to_s(:posted) : " "

app/views/dashboard/_trackers.html.haml

@@ -8,16 +8,22 @@
     %tr
       %th Catégorie
       %th Sujet
+      %th Date
       %th État
       %th Note
-      %th Nombre de commentaires
-      %th Date du message
+      %th <abbr title="Nombre de réponses">Rép.</abbr>
+      %th Dernière réponse
     - @trackers.each do |node|
       - tracker = node.content
+      - answer = node.last_answer
       %tr{class: tracker.state}
         %td= tracker.category.title
         %td= link_to tracker.title, tracker
+        %td.date= tracker.created_at.to_s(:posted)
         %td= tracker.state_name
         %td.number= node.score
-        %td.number= node.comments.count
-        %td.date= tracker.created_at.to_s(:posted)
+        %td.number
+          - if answer && !answer.read_by?(current_account)
+            = image_tag "/images/icones/comment.png", alt: "Nouveaux commentaires !", class: "thread-new-comments"
+          = node.comments.count
+        %td.date= answer ? answer.created_at.to_s(:posted) : " "