Pastable version of Swedish Personnummer in Rails (Ruby)

<pre class='prettyprint' language='ruby'>def validate_ssn
    # Kontrollera antal siffror i personnummret.
    if ssn.size != 10
      errors.add_to_base &quot;Personnummret innehÃ¥ller fel antal siffror. (Ã…Ã…MMDDXXXX)&quot;
    end
    
    # RÃ¤kna ut kontrollsiffran
    sum = tmp = 0

(0..8).each do |i|
      if i % 2 == 0 
        if (tmp = 2 * ssn[i,1].to_i) &gt; 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 mÃ¥ste vara riktigt.'
      end
    else
      if ssn[9,1] != 0
        errors.add_to_base 'Personnummret mÃ¥ste vara riktigt.'
      end
    end
    
  end</pre>
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Pastable version of Swedish Personnummer in Rails (Ruby)