The Rails 5 attributes API allows us to build form objects very easily.
I had previously been using an after_initialize callback to downcase emails, with the following code I can define an :email date type and values are automatically cast when set.
This has the advantage of casting subsequent calls to set the email value.
class EmailType < ActiveModel::Type::String def cast(value) return super unless value.is_a?(String) super(value.downcase) end end ActiveModel::Type.register(:email, EmailType)
class Foo include ActiveModel::Model include ActiveModel::Attributes attribute :email, :email end
> Foo.new(email: 'EMAIL@MAIL.com').email => 'email@example.com'
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