Rails programming trick - macro to wrap a method call in a transaction

transaction_trick.rb

module WithTransaction
  extend ActiveSupport::Concern

  module ClassMethods

    # Wrap the given method in a transaction.
    def with_transaction(method_name)

      define_method "#{method_name}_with_transaction" do |*args, &block|

        ::ActiveRecord::Base.transaction do
          self.__send__("#{method_name}_without_transaction", *args, &block)
        end

      end
      alias_method_chain method_name, :transaction

    end

  end
end

# You can now do things like...

class Foo
  include WithTransaction
  
  with_transaction def bar(arg1, arg2)
    # Everything in this method is now wrapped in a db transaction
    arg1.some_operation
    arg2.some_other_operation
    arg1.save!
    arg2.save!
  end
end