Forum: Ruby on Rails Validation with Aggregation

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A944b656e1e9cfd45f1e6714435b0a54?d=identicon&s=25 Simon Harris (Guest)
on 2005-12-16 07:54
(Received via mailing list)
ActiveRecord supports composed_of for value objects which is
fantastic but one thing that it doesn't seem to support (or at least
I am unable to find any documentation for) validation of the value
objects.

For example, given the following:

class Message < ActiveRecord::Base
	composed_of :sender, :class_name => 'EmailAddress'
	composed_of :recipient, :class_name => 'EmailAddress'
	...
end

class EmailAddress
	attr_reader :name, :address
	def initialize(name, address)
		@name, @address = name, address
	end
	...
end

How can I best take advantage of Rails' validation, given that I'd
like to only specify the validation rules for EmailAddress once. The
validation rules might look something like:

	validates_presence_of :name, :address
	validates_format_of :email, :with => ADDRESS_FORMAT

I'm guessing the obvious answer is to create an email_addresses table
and use belongs_to but that seems (to me at least) a somewhat heave-
handed approach.

Regards,

Simon

--
Simon Harris
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