Add Instance class to list admin records (#3443)

app/controllers/admin/instances_controller.rb

@@ -3,13 +3,18 @@
 module Admin
   class InstancesController < BaseController
     def index
-      @instances = ordered_instances.page(params[:page])
+      @instances = ordered_instances
     end
 
     private
 
+    def paginated_instances
+      Account.remote.by_domain_accounts.page(params[:page])
+    end
+    helper_method :paginated_instances
+
     def ordered_instances
-      Account.remote.by_domain_accounts
+      paginated_instances.map { |account| Instance.new(account) }
     end
   end
 end