Rails 3 validates inclusion of when using a find (how to proc or lambda)
Just use a proc, like so:
validates :currency_code, :presence => true, :inclusion => { :in => proc { Currency.all_codes } }validates :country_code, :presence => true, :inclusion => { :in => proc { Country.all_codes } }It's worth noting for anyone else who may stumble across this that the proc also has the record accessible as a parameter. So you can do something like this:
validates :currency_code, :presence => true, :inclusion => { :in => proc { |record| record.all_codes } }def all_codes ['some', 'dynamic', 'result', 'based', 'upon', 'the', 'record']end
Note: This answer is true for old versions of Rails, but for Rails 3.1 and above, procs are accepted.
It must not accept Procs. You can use a custom validation method to do the same thing:
validate :currency_code_existsdef currency_code_exists errors.add(:base, "Currency code must exist") unless Currency.all_codes.include?(self.currency_code)end