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Contents
module ActiveModel
module Validations
class BarcodeValidator < EachValidator
# We check the validity of :format option
# More at https://github.com/rails/rails/blob/aa7fdfb859d8a73f58460a7aba7174a47b5101d5/activemodel/lib/active_model/validator.rb#L180
def check_validity!
format = options.fetch(:format)
raise ArgumentError, ":format cannot be blank!" if format.blank?
method = "valid_#{format.to_s}?"
raise ArgumentError, "Barcode format (#{format}) not supported" unless self.respond_to?(method)
end
def validate_each(record, attribute, value)
method = "valid_#{options[:format].to_s}?"
record.errors.add(attribute) if value.blank? || !self.send(method, value.to_s)
end
def valid_ean13?(value)
if value =~ /^\d{13}$/
ean13_check_digit(value.slice(0,12)) == value.slice(12)
end
end
private
# Comes from http://fr.wikipedia.org/wiki/Code-barres_EAN
def ean13_check_digit(value)
even_sum, uneven_sum = 0, 0
value.split('').each_with_index do |digit, index|
if (index+1).even?
even_sum += digit.to_i
else
uneven_sum += digit.to_i
end
end
((10 - ((even_sum*3 + uneven_sum) % 10)) % 10).to_s
end
end
end
end
Version data entries
11 entries across 11 versions & 1 rubygems