Notification when created merge request

app/mailers/notify.rb

@@ -38,4 +38,11 @@ class Notify < ActionMailer::Base
     @issue = note.noteable
     mail(:to => @user.email, :subject => "gitlab | #{@note.project.name} ")
   end
+  
+  def new_merge_request_email(merge_request)
+    @user = merge_request.assignee
+    @merge_request = merge_request
+    @project = merge_request.project
+    mail(:to => @user.email, :subject => "gitlab | #{@merge_request.title} ")
+  end
 end

app/models/mailer_observer.rb

 class MailerObserver < ActiveRecord::Observer
-  observe :issue, :user, :note, :snippet
+  observe :issue, :user, :note, :merge_request
   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)
+    new_merge_request(model) if model.kind_of?(MergeRequest)
   end
 
   protected
@@ -38,4 +39,10 @@ class MailerObserver < ActiveRecord::Observer
       end
     end
 
+    def new_merge_request(merge_request)
+      if merge_request.assignee != current_user
+        Notify.new_merge_request_email(merge_request).deliver
+      end
+    end
+
 end

app/views/notify/new_merge_request_email.html.haml

+%td.content{:align => "left", :style => "font-family: Helvetica, Arial, sans-serif; padding: 20px 0 0;", :valign => "top", :width => "600"}
+  %table{:border => "0", :cellpadding => "0", :cellspacing => "0", :style => "color: #717171; font: normal 11px Helvetica, Arial, sans-serif; margin: 0; padding: 0;", :width => "600"}
+    %tr
+      %td{:style => "font-size: 1px; line-height: 1px;", :width => "21"}
+      %td{:align => "left", :style => "padding: 20px 0 0;"}
+        %h2{:style => "color:#646464; font-weight: bold; margin: 0; padding: 0; line-height: 26px; font-size: 18px; font-family: Helvetica, Arial, sans-serif; "}
+          New Merge Request
+          = link_to truncate(@merge_request.title, :length => 16), project_merge_request_url(@project, @merge_request)
+      %td{:style => "font-size: 1px; line-height: 1px;", :width => "21"}
+    %tr
+      %td{:style => "font-size: 1px; line-height: 1px;", :width => "21"}
+      %td{:style => "padding: 15px 0 15px;", :valign => "top"}
+        %p{:style => "color:#767676; font-weight: normal; margin: 0; padding: 0; line-height: 20px; font-size: 12px;font-family: Helvetica, Arial, sans-serif; "}
+          Branches: #{@merge_request.source_branch} → #{@merge_request.target_branch}
+        
+        %p{:style => "color:#767676; font-weight: normal; margin: 0; padding: 0; line-height: 20px; font-size: 12px;font-family: Helvetica, Arial, sans-serif; "}
+          Asignee: #{@merge_request.author.name} → #{@merge_request.assignee.name}      
+      
+      %td
+