RubyMoney/money · error · Money::Bank::DifferentCurrencyError

No exchanging of currencies allowed: #{from} #{from.currency

Error message

No exchanging of currencies allowed: #{from} #{from.currency} to #{to_currency}

What it means

Error "No exchanging of currencies allowed: #{from} #{from.currency} to #{to_currency}" thrown in RubyMoney/money.

Source

Thrown at lib/money/bank/single_currency.rb:21

require "money/bank/base"

class Money
  module Bank
    # Raised when trying to exchange currencies
    class DifferentCurrencyError < Error; end

    # Class to ensure client code is operating in a single currency
    # by raising if an exchange attempts to happen.
    #
    # This is useful when an application uses multiple currencies but
    # it usually deals with only one currency at a time so any arithmetic
    # where exchanges happen are erroneous. Using this as the default bank
    # means that that these mistakes don't silently do the wrong thing.
    class SingleCurrency < Base
      # Raises a DifferentCurrencyError to remove possibility of accidentally
      # exchanging currencies
      def exchange_with(from, to_currency, &)
        raise DifferentCurrencyError, "No exchanging of currencies allowed: #{from} #{from.currency} to #{to_currency}"
      end
    end
  end
end

View on GitHub (pinned to 26e2829c34)

When it happens

Trigger: Thrown at lib/money/bank/single_currency.rb:21 when the library encounters an invalid state.

Common situations: See trigger scenarios.

AI-assisted analysis of RubyMoney/money@26e2829c34 (2026-08-23). Data as JSON: /api/errors/8775bdd6157dbfdd. Report an issue: GitHub.