[rubas]

Before

iex> params = Money.Ecto.Composite.Type.init(locale: "!invalid!")
iex> Money.Ecto.Composite.Type.cast("100 CHF", params)
{:ok, {:error, %Localize.InvalidLocaleError{locale_id: "!invalid!"}}}
iex> Money.Ecto.Composite.Type.cast(%{"currency" => "CHF", "amount" => "100"}, params)
** (CaseClauseError) no case clause matching:
    {:error, %Localize.InvalidLocaleError{locale_id: "!invalid!"}}

Problem

• A string cast succeeds with an error tuple as the value, so the changeset looks valid.
• A map cast crashes.
• Money.Ecto.Map.Type delegates cast/2, so it has the same bug.

After

defp cast_result(%Money{} = money), do: {:ok, money}

defp cast_result({:error, {exception, message}}),
  do: {:error, exception: exception, message: message}

defp cast_result({:error, exception}) when is_exception(exception),
  do: {:error, exception: exception.__struct__, message: Exception.message(exception)}

iex> Money.Ecto.Composite.Type.cast("100 CHF", params)
{:error, [exception: Localize.InvalidLocaleError, message: "The locale \"!invalid!\" is not valid."]}
iex> Money.Ecto.Composite.Type.cast(%{"currency" => "CHF", "amount" => "100"}, params)
{:error, [exception: Localize.InvalidLocaleError, message: "The locale \"!invalid!\" is not valid."]}

Details

• Cause: Money.Ecto.Composite.Type.cast/2 matches only {:error, {module, message}}. Money.new/3 and Money.parse/2 return {:error, exception} for errors from Localize.
• Both shapes now go through cast_result/1 and keep the existing exception: and message: keyword error.
• The three map clauses for an integer, binary, and Decimal amount had the same body, so they are now one clause.
• Tests: two cases in test/money_ecto_edge_case_test.exs, for both types and for string, string-keyed map, and atom-keyed map input.
• mix test (179 passed, 5 skipped, PostgreSQL 17) and mix format --check-formatted pass.

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AI disclosure: AI models helped us find this issue, write the change, and review it.