f.error_messages in Rails 3.0

Question

Rails 3.0 deprecated f.error_messages and now requires a plugin to work correctly - I however want to learn how to display error messages the (new) native way.

Answer 1

This functionality exists as a standalone gem dynamic_form.

Add the the following to your Gemfile

gem 'dynamic_form'

From the github page:

DynamicForm holds a few helpers method to help you deal with your Rails3 models, they are:

• input(record, method, options = {})
• form(record, options = {})
• error_message_on(object, method, options={})
• error_messages_for(record, options={})

It also adds f.error_messages and f.error_message_on to your form builders.