demarches-normaliennes/app/validators/siret_format_validator.rb

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2015-12-03 15:02:22 +01:00
class SiretFormatValidator < ActiveModel::EachValidator
def validate_each(record,attribute,value)
unless value =~ /^\d{14}$/
record.errors.add(attribute, :format)
end
unless value!= nil && (luhn_checksum(value) % 10 == 0)
record.errors.add(attribute, :checksum)
end
end
private
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def luhn_checksum(value)
accum = 0
value.reverse.each_char.map(&:to_i).each_with_index do |digit, index|
t = index.even? ? digit : digit * 2
t = t - 9 if t >= 10
accum += t
end
accum
end
end