gist: 99156


  
      migration.rb #
    
    
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              class AddSecurityStringToOrder < ActiveRecord::Migration
  def self.up
    add_column :orders, :security_string, :string
  end
 
  def self.down
    remove_column :orders, :security_string
  end
end
 
            
      order.rb #
    
    
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              ...
 
before_create :set_security_string
 
def set_security_string
  self.security_string = Digest::SHA1.hexdigest("#{Time.now}#{rand.to_s}")[0..15]
end
 
def to_param
  security_string
end
 
...
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