Rails before_filter different arguments

Question

I have controller actions which all use one method but with different arguments. Can I refactor this somehow to use before_filter?

  def usd_cash
    transaction_currency("USD cash")
  end

  def usd_bank
    transaction_currency("USD bank")
  end

  def rub_bank
    transaction_currency("RUB bank")
  end

  private

  def transaction_currency(currency)
    @transactions = Transaction.where(location: "#{currency}")
  end

Answer 1

You could use some metaprogramming, but this would not be as readable as what you currently have:

%i(
  usd_cash
  usd_bank
  rub_bank
).each do |method|
  define_method method do
    transaction_currency(method.to_s.split('_').instance_eval {first.upcase + ' ' + last})
  end
end