Rails 5.0

app/models/user.rb

@@ -72,7 +72,7 @@ class User < ApplicationRecord
       self.settings.merge!(key, value)
     end if settings_attributes
 
-    if ActiveRecord::Type::Boolean.new.type_cast_from_user(create_ordergroup)
+    if ActiveModel::Type::Boolean.new.cast(create_ordergroup)
       og = Ordergroup.new({name: name})
       og.memberships.build({user: self})
       og.save!
@@ -82,7 +82,7 @@ class User < ApplicationRecord
   end
 
   def send_welcome_mail?
-    ActiveRecord::Type::Boolean.new.type_cast_from_user(send_welcome_mail)
+    ActiveModel::Type::Boolean.new.cast(send_welcome_mail)
   end
 
   # sorted by display name

app/views/orders/_form.html.haml

@@ -13,7 +13,7 @@
   %h2= t '.title'
   - if @order.errors.has_key?(:articles)
     .alert.alert-error
-      = @order.errors.get(:articles).join(" ")
+      = @order.errors.messages[:articles].join(" ")
   %table.table.table-hover#articleList
     %tr
       %th= check_box_tag 'checkall', "1", false, { 'data-check-all' => '#articleList' }