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def validate_ssn # Kontrollera antal siffror i personnummret. if ssn.size != 10 errors.add_to_base "Personnummret innehåller fel antal siffror. (ÅÅMMDDXXXX)" end # Räkna ut kontrollsiffran sum = tmp = 0 (0..8).each do |i| if i % 2 == 0 if (tmp = 2 * ssn[i,1].to_i) > 9 sum = sum + tmp - 9 else sum = sum + tmp end else sum = sum + ssn[i,1].to_i end end if (sum % 10) != 0 if (10 - (sum % 10)) != ssn[9,1].to_i errors.add_to_base 'Personnummret måste vara riktigt.' end else if ssn[9,1] != 0 errors.add_to_base 'Personnummret måste vara riktigt.' end end end
Refactorings
No refactoring yet !
Marc-Andre
April 7, 2009, April 07, 2009 18:26, permalink
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My Swedish is a bit rusty, but isn't that simply Luhn's check?
You can add all the numbers and check the sum (mod 10) is 0.
You might want to add a check that only numbers have been passed.
I didn't check the following code:
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def passes_luhn_check?(str) sum = 0 numbers = str.split(//).map(&:to_i) numbers.each_with_index do |n, i| n *= 2 if i.even? n -= 9 if n >= 10 sum += n end sum % 10 == 0 end def validate_ssn # Kontrollera antal siffror i personnummret. if ssn.size != 10 errors.add_to_base "Personnummret innehåller fel antal siffror. (ÅÅMMDDXXXX)" end # Räkna ut kontrollsiffran errors.add_to_base 'Personnummret måste vara riktigt.' unless passes_luhn_check?(ssn) end
Canotooge-tool
December 5, 2009, December 05, 2009 08:23, permalink
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lart mycket
Code for checking swedish "personnummer".