Fake unique property with Faker (https://github.com/stympy/faker)

fake_unique.rb

# ActiveRecord edition
# For use with DataMapper replace line 7 with the following line
# if model.first(property.to_sym => result).nil?

def fake_unique(model, property, method_module, method)
  result = method_module.send(method.to_sym)
  if model.where(property.to_sym => result).first.nil?
    result
  else
    fake_unique(model, property, method_module, method)
  end
end

# Usage: fake_unique(User, :email, Faker::Internet, :free_email)