Question 1

How to store money with multiple currencies in Elixir Ecto?

Accepted Answer

Use Money.Ecto.Composite.Type for PostgreSQL composite types or Money.Ecto.Map.Type for JSON serialization. The README provides step-by-step migration and schema examples for both methods.

Question 2

Money library or Decimal for Elixir currency?

Accepted Answer

Money is designed specifically for monetary values with currency support and Ecto integration, while Decimal handles arbitrary-precision decimals. Money can use Decimal for parsing large numbers, but for core arithmetic, Money's integer-based approach is safer for financial accuracy.

Question 3

How to add custom currencies like Bitcoin in Money?

Accepted Answer

Configure custom_currencies in your config file with details such as name, symbol, and exponent. For example, add BTC with an exponent of 8 to represent satoshis, as shown in the configuration section.

Question 4

How to format money with the currency symbol on the right?

Accepted Answer

Set symbol_on_right: true in the configuration or pass it as an option to Money.to_string. You can also use custom_display_options for per-currency settings, like for EUR or JPY.

Question 5

Does Money support Phoenix template rendering?

Accepted Answer

Yes, it implements the Phoenix.HTML.Safe protocol, allowing direct embedding of Money structs in templates without additional escaping, as mentioned in the Phoenix compatibility section.

Question 6

How to validate that a money amount is positive in Ecto changesets?

Accepted Answer

Create a custom validation function that checks the amount field of the Money struct, since standard Ecto validators like validate_number are incompatible. The troubleshooting section provides an example with validate_money.

money

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