Notification refactoring

app/models/mailer_observer.rb

@@ -0,0 +1,41 @@
+class MailerObserver < ActiveRecord::Observer
+  observe :issue, :user, :note, :snippet
+  cattr_accessor :current_user
+
+  def after_create(model)
+    new_issue(model) if model.kind_of?(Issue)
+    new_user(model) if model.kind_of?(User)
+    new_note(model) if model.kind_of?(Note)
+  end
+
+  protected
+
+    def new_issue(issue)
+      if issue.assignee != current_user
+        Notify.new_issue_email(issue).deliver
+      end
+    end
+
+    def new_user(user)
+      Notify.new_user_email(user, user.password).deliver
+    end
+
+    def new_note(note)
+      return unless note.notify
+      note.project.users.reject { |u| u.id == current_user.id } .each do |u|
+        case note.noteable_type
+        when "Commit" then
+          Notify.note_commit_email(u, note).deliver
+        when "Issue" then
+          Notify.note_issue_email(u, note).deliver
+        when "MergeRequest"
+          true # someone should write email notification
+        when "Snippet"
+          true
+        else
+          Notify.note_wall_email(u, note).deliver
+        end
+      end
+    end
+
+end