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feat: add MoneyJSON type for JSON serialization of Money #2

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Merged
TheTuso merged 1 commit into from
Apr 8, 2026
Merged

feat: add MoneyJSON type for JSON serialization of Money #2

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23 changes: 14 additions & 9 deletions money.go
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Original file line number Diff line number Diff line change
@@ -1,7 +1,6 @@
package monies

import (
"bytes"
"encoding/json"
"errors"
"fmt"
Expand All @@ -10,6 +9,15 @@ import (
"strings"
)

// MoneyJSON is the JSON wire format of Money. It exists as a separate
// exported type so that reflection/AST-based introspection tools (e.g.
// swaggo, jsonschema generators) can derive the correct schema — Money's
// fields are unexported and thus invisible to such tools.
type MoneyJSON struct {
Amount int64 `json:"amount"`
Currency CurrencyCode `json:"currency"`
}

var (
ErrCurrencyMismatch = errors.New("currencies mismatched")
ErrNegativeSplit = errors.New("split be must be positive")
Expand Down Expand Up @@ -82,12 +90,7 @@ func (m Money) AsMajorUnits() float64 {
}

func (m *Money) UnmarshalJSON(b []byte) error {
type moneyJSON struct {
Currency CurrencyCode `json:"currency"`
Amount int64 `json:"amount"`
}

var ref moneyJSON
var ref MoneyJSON
err := json.Unmarshal(b, &ref)
if err != nil {
return err
Expand Down Expand Up @@ -151,8 +154,10 @@ func (m Money) MarshalText() ([]byte, error) {
}

func (m Money) MarshalJSON() ([]byte, error) {
buff := bytes.NewBufferString(fmt.Sprintf(`{"amount": %d, "currency": "%s"}`, m.Amount(), m.Currency().Code))
return buff.Bytes(), nil
return json.Marshal(MoneyJSON{
Amount: m.amount,
Currency: m.currency.Code,
})
}

func (m Money) SameCurrency(om Money) bool {
Expand Down
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