commentのcallbackを追加

app/models/comment.rb

@@ -17,4 +17,13 @@ class Comment < ActiveRecord::Base
   validates :author_id, presence: true
   validates :post_id, presence: true
   validates :body, presence: true
+
+  ### Callback ###
+  after_save :notify_author
+
+  private
+
+  def notify_author
+    post.author.push_notification(post.decorate.show_path, "#{author.name}さんがあなたの投稿にコメントしました")
+  end
 end

app/views/flow/show.html.slim

@@ -23,6 +23,8 @@
         h2.panel-title 最近投稿されたタグ
       .panel-body.list-group
         - Tag.recent(10).each_with_index do |tag, i|
-          a.list-group-item data-tag-id=tag.id href=search_path(q: "##{tag.name}") = "#{tag.name} (#{tag.posts_count})"
+          a.list-group-item data-tag-id=tag.id href=search_path(q: "##{tag.name}")
+            = tag.name
+            span.badge = tag.posts_count