Created
July 30, 2012 15:45
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rails active_model validator for singapore nric & car plate; courtesy www.tinkerbox.com.sg
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class SingaporeLicensePlateValidator < ActiveModel::EachValidator | |
def validate_each(record, attribute, value) | |
record.errors[attribute] << (options[:message] || "is not valid") unless valid_format?(value) | |
end | |
def valid_format?(license_plate) | |
prefix, numbers, suffix = license_plate.to_s.upcase.gsub(/\W+/, '').scan(/^\s*([A-Z]{1,3})(\d{1,4})(.+)$/).flatten | |
license_plate = ('%3s' % prefix.to_s) + ('%4d' % numbers.to_i) + suffix.to_s | |
zero = ('A'.ord-1).chr | |
numbers = [] | |
license_plate.each_char {|char| numbers.push((num = char.ord - zero.ord) > 0 ? num : char)} | |
numbers = numbers.zip([3, 14, 2, 12, 2, 11, 1]).collect {|(a,b)| a.to_i * b.to_i } | |
remainder = numbers.sum % 19 | |
'AYUSPLJGDBZXTRMKHEC'[remainder] == license_plate[-1] | |
end | |
end |
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# class Entity < ActiveRecord::Base | |
# validates :name, presence: true, singapore_nric: true | |
# end | |
class SingaporeNricValidator < ActiveModel::EachValidator | |
def validate_each(record, attribute, value) | |
record.errors[attribute] << (options[:message] || "is not valid") unless valid_format?(value) | |
end | |
def valid_format?(nric) | |
nric = '%9s' % nric.to_s.upcase.gsub(/\W+/, '') | |
numbers = [] | |
nric[1..7].to_s.each_char {|c| numbers.push(c.to_i) } | |
total = numbers.zip([2, 7, 6, 5, 4, 3, 2]).collect {|(a,b)| a.to_i * b.to_i }.sum | |
total += 4 if ['T', 'G'].include?(nric[0]) | |
remainder = total % 11 | |
result = (['S', 'T'].include?(nric[0]) ? 'JZIHGFEDCBA' : 'XWUTRQPNMLK')[remainder] | |
result == nric[-1] | |
end | |
end |
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