whenever a story/comment is moderated, send a message to the user

app/models/moderation.rb

@@ -7,4 +7,51 @@ class Moderation < ActiveRecord::Base
   belongs_to :user
 
   attr_accessible nil
+
+  after_create :send_message_to_moderated
+
+  def send_message_to_moderated
+    m = Message.new
+    m.author_user_id = self.moderator_user_id
+
+    if self.story
+      m.recipient_user_id = self.story.user_id
+      m.subject = "Your story has been edited by a moderator"
+      m.body = "Your story [#{self.story.title}](" <<
+        "#{self.story.comments_url}) has been edited by a moderator with " <<
+        "the following changes:\n" <<
+        "\n" <<
+        "> *#{self.action}*\n"
+
+      if self.reason.present?
+        m.body << "\n" <<
+          "The reason given:\n" <<
+          "\n" <<
+          "> *#{self.reason}*"
+      end
+
+    elsif self.comment
+      m.recipient_user_id = self.comment.user_id
+      m.subject = "Your comment has been moderated"
+      m.body = "Your comment on [#{self.comment.story.title}](" <<
+        "#{self.story.comments_url}) has been moderated:\n" <<
+        "\n" <<
+        "> *#{self.comment.comment}*"
+
+      if self.reason.present?
+        m.body << "\n" <<
+          "The reason given:\n" <<
+          "\n" <<
+          "> *#{self.reason}*"
+      end
+
+    else
+      # no point in alerting deleted users, they can't login to read it
+      return
+    end
+
+    # so this will be deleted when the recipient deletes it
+    m.deleted_by_author = true
+    m.save
+  end
 end