Bring user and ability related files from spree_core

config/initializers/user_class_extensions.rb

@@ -0,0 +1,25 @@
+Spree::Core::Engine.config.to_prepare do
+  if Spree.user_class
+    Spree.user_class.class_eval do
+      include Spree::Core::UserBanners
+      has_and_belongs_to_many :spree_roles,
+                              :join_table => 'spree_roles_users',
+                              :foreign_key => "user_id",
+                              :class_name => "Spree::Role"
+
+      has_many :spree_orders, :foreign_key => "user_id", :class_name => "Spree::Order"
+
+      belongs_to :ship_address, :class_name => 'Spree::Address'
+      belongs_to :bill_address, :class_name => 'Spree::Address'
+
+      # has_spree_role? simply needs to return true or false whether a user has a role or not.
+      def has_spree_role?(role_in_question)
+        spree_roles.where(:name => role_in_question.to_s).any?
+      end
+
+      def last_incomplete_spree_order
+        spree_orders.incomplete.where(:created_by_id => self.id).order('created_at DESC').first
+      end
+    end
+  end
+end