updated rails to 4.2.4

app/mailers/mailbot.rb

@@ -80,6 +80,22 @@ class Mailbot < ActionMailer::Base
     end
   end
 
+  def send_notification_email_for_comment(comment)
+    @comment = comment
+    @event = @comment.commentable
+    @conference = @event.conference
+    recipients = User.comment_notifiable(@conference) # with scope
+    recipients.each do |user|
+      @user = user
+      mail(to: @user.email,
+           from: @conference.contact.email,
+           reply_to: @conference.contact.email,
+           template_path: 'admin/emails',
+           template_name: 'comment_template',
+           subject: "New comment has been posted for #{@event.title}")
+    end
+  end
+
   def build_email(conference, to, subject, body)
     mail(to: to,
          from: conference.contact.email,