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Ruby on Rails (Money.gem 3.0.3 and later)

semmons99 edited this page Apr 9, 2012 · 14 revisions

Use the `#composed_of` helper to let Active Record deal with embedding the money object in your models. The following example requires a `price_in_cents` and a `currency` field.

composed_of :price,
  :class_name => "Money",
  :mapping => [%w(price_in_cents cents), %w(currency currency_as_string)],
  :constructor => Proc.new { |cents, currency| Money.new(cents || 0, currency || Money.default_currency) },
  :converter => Proc.new { |value| value.respond_to?(:to_money) ? value.to_money : raise(ArgumentError, "Can't convert #{value.class} to Money") }

Adding a converter Proc to the `#composed_of` allow any string (eg : textfield) to be saved in the model through Money.parse (or String.to_money) if you have a second field with the currency, it will use it to create the Money object.

With the example above, your migration should include the following lines:

...
t.integer  :price_in_cents, :default => 0, :null => false
t.string   :currency,                      :null => false
...
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