Question

We’re using the Ruby Money gem. It works great.

We now have a new requirement to round the converted currency amount to whole dollar (without
the pennies).

I have found Ruby’s round method for Fixnum

190.round(-1) returns 200
149.round(-1) returns 100

which is what I want.

I see that Money::Bank::VariableExchange class supports a rounding_method.

I can get a handle to the bank object by calling

Money.default_bank

but how do I register or assign the rounding method to the Money.default_bank object?

Thank you!

Answer 1

Since you want to use the Bank VariableExchange:

Money.default_bank = Money::Bank::VariableExchange.new { |n| n.round(-2) }

Will set your default bank to use the VariableExchange, and round exchanges to the nearest dollar.