Using money-rails minidollars unit instead of cents

Question

By default, money save value in cents and create migration like price_cents:integer. I need to save and calculate values in minidollars (1/1000 of currency).

I don't register currencies myself. I use gem google_currency for getting current currency rates.

How can i set precision 1/1000 for all money values?

  * rails (4.2.1)
  * money (6.5.1)
  * money-rails (1.4.1)
  * google_currency (3.2.0)

Answer 1

According to the documentation, you can register your own subunit:

curr = {
  :priority        => 1,
  :iso_code        => "USD",
  :iso_numeric     => "840",
  :name            => "United States Dollar",
  :symbol          => "$",
  :subunit         => "Minidollar",
  :subunit_to_unit => 1000,
  :separator       => ".",
  :delimiter       => ","
}

Money::Currency.register(curr)

Google Currency just extends Money::Bank::VariableExchange, so now you'd do this to create a $1 item and get the value in Euros:

money = Money.new(10_00, "USD") # this is in "minidollars"
money.exchange_to(:EUR)