Merge pull request #1316 from consul/signature-sheets-polish

Only stores alphanumeric characters of a signature's document number

app/models/signature.rb

@@ -10,6 +10,8 @@ class Signature < ActiveRecord::Base
 
   delegate :signable, to: :signature_sheet
 
+  before_validation :clean_document_number
+
   def verified?
     user_exists? || in_census?
   end
@@ -58,6 +60,11 @@ class Signature < ActiveRecord::Base
     User.create!(user_params)
   end
 
+  def clean_document_number
+    return if self.document_number.blank?
+    self.document_number = self.document_number.gsub(/[^a-z0-9]+/i, "").upcase
+  end
+
   def random_password
     (0...20).map { ('a'..'z').to_a[rand(26)] }.join
   end