jbranchaud/money

Elixir library for working with Money safer, easier, and fun... Is an interpretation of the Fowler's Money pattern in fun.prog.

Money

Elixir library for working with Money safer, easier, and fun, is an interpretation of the Fowler's Money pattern in fun.prog.

"If I had a dime for every time I've seen someone use FLOAT to store currency, I'd have $999.997634" -- Bill Karwin

In short: You shouldn't represent monetary values by a float. Wherever you need to represent money, use Money.

USAGE

five_eur         = Money.new(500, :EUR)             # %Money{amount: 500, currency: :EUR}
ten_eur          = Money.add(five_eur, five_eur)    # %Money{amount: 10_00, currency: :EUR}
hundred_eur      = Money.multiply(ten_eur, 10)      # %Money{amount: 100_00, currency: :EUR}
ninety_nine_eur  = Money.subtract(hundred_eur, 1)   # %Money{amount: 99_00, currency: :EUR}
shares           = Money.divide(ninety_nine_eur, 2)
[%Money{amount: 50, currency: :EUR}, %Money{amount: 49, currency: :EUR}]

Money.equals?(five_eur, Money.new(500, :EUR)) # true
Money.zero?(five_eur);                        # false
Money.positive?(five_eur);                    # true

Money.Currency.symbol(:USD)                   # $
Money.Currency.symbol(Money.new(500, :AFN))   # ؋
Money.Currency.name(Money.new(500, :AFN))     # Afghani

Money.to_string(Money.new(500, :CNY))         # ¥ 5.00
Money.to_string(Money.new(1_234_56, :EUR), separator: ".", delimeter: ",", symbol: false)
"1.234,56"

Money.Sigils

# Sigils for Money
import Money.Sigils

iex> ~M[1000]USD
%Money{amount: 1000, currency: :USD}

# If you have a default currency configured (e.g. to GBP), you can do
iex> ~M[1000]
%Money{amount: 1000, currency: :GBP}

Money.Currency

# Currency convenience methods
import Money.Currency, only: [usd: 1, eur: 1, afn: 1]

iex> usd(100_00)
%Money{amount: 10000, currency: :USD}
iex> eur(100_00)
%Money{amount: 10000, currency: :EUR}
iex> afn(100_00)
%Money{amount: 10000, currency: :AFN}

Money.Currency.symbol(:USD)     # $
Money.Currency.symbol(afn(500)) # ؋
Money.Currency.name(afn(500))   # Afghani
Money.Currency.get(:AFN)        # %{name: "Afghani", symbol: "؋"}

Money.Ecto.Type

Bring Money to your Ecto project. The underlying database type is integer

# migration
create table(:my_table) do
  add :amount, :integer
end

# model/schema
schema "my_table" do
  field :amount, Money.Ecto.Type
end

Phoenix.HTML.Safe

Bring Money to your Phoenix project. If you are using Phoenix, you can include money objects directly into your output and they will be correctly escaped.

<b><%= Money.new(12345,67, :GBP) %></b>

INSTALLATION

Money comes with no required dependencies.

Add the following to your mix.exs:

def deps do
  [{:money, "~> 1.1.0"}]
end

then run mix deps.get.

CONFIGURATION

You can set a default currency and default formatting preferences as follows:

config :money,
  default_currency: :EUR,
  separator: ".",
  delimeter: ",",
  symbol: false,
  symbol_on_right: false,
  symbol_space: false

Then you don’t have to specify the currency.

iex> amount = Money.new(1_234_50)
%Money{amount: 123450, currency: :EUR}
iex> to_string(amount)
"1.234,50"

Here is another example of formatting money:

iex> amount = Money.new(1_234_50)
%Money{amount: 123450, currency: :EUR}
iex> Money.to_string(amount, symbol: true, symbol_on_right: true, symbol_space: true)
"1.234,50 €"

LICENSE

MIT License please see the LICENSE file.