Extract observation of User to a UserObserver

app/models/mailer_observer.rb

@@ -1,9 +1,8 @@
 class MailerObserver < ActiveRecord::Observer
-  observe :issue, :user, :note, :merge_request
+  observe :issue, :note, :merge_request
   cattr_accessor :current_user
 
   def after_create(model)
-    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
@@ -14,10 +13,6 @@ class MailerObserver < ActiveRecord::Observer
 
   protected
 
-  def new_user(user)
-    Notify.new_user_email(user.id, user.password).deliver
-  end
-
   def new_note(note)
     if note.notify
       # Notify whole team except author of note

app/models/user_observer.rb

@@ -0,0 +1,5 @@
+class UserObserver < ActiveRecord::Observer
+  def after_create(user)
+    Notify.new_user_email(user.id, user.password).deliver
+  end
+end