The easiest way is probably to just define a custom method and use that for
validation:
validate :registration_code_must_be_valid
def registration_code_must_be_valid
# check if it's one of the hard coded values
unless [ 'code1', 'code2' ].include?(registration_code)
errors.add(:registration_code, "must be valid")
end
# or check if it's in another model if you want to do it dynamically
unless RegistrationCode.find_by_code(registration_code)
errors.add(:registration_code, "must be valid")
end
end
Another option is to create a custom validator. Check out that section of
the guide:
http://guides.rubyonrails.org/active_record_validations_callbacks.html#custom-validators
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