fix(scw): decimal json representation (scaleway#2235)

Author: Codelax

scw/custom_types.go

@@ -460,3 +460,24 @@ var _ fmt.Stringer = (*Decimal)(nil)
 func (d Decimal) String() string {
 	return string(d)
 }
+
+func (d Decimal) MarshalJSON() ([]byte, error) {
+	return json.Marshal(map[string]interface{}{
+		"value": d.String(),
+	})
+}
+
+func (d *Decimal) UnmarshalJSON(b []byte) error {
+	m := struct {
+		Value string `json:"value"`
+	}{}
+
+	err := json.Unmarshal(b, &m)
+	if err != nil {
+		return err
+	}
+
+	*d = Decimal(m.Value)
+
+	return nil
+}

scw/custom_types_test.go

@@ -841,3 +841,20 @@ func TestDecimal(t *testing.T) {
 	*dPtr = "1.22"
 	testhelpers.Equals(t, "1.22", dPtr.String())
 }
+
+func TestDecimal_MarshalJSON(t *testing.T) {
+	d := Decimal("1.22")
+	testhelpers.Equals(t, "1.22", d.String())
+
+	value, err := json.Marshal(d)
+	testhelpers.AssertNoError(t, err)
+	testhelpers.Equals(t, "{\"value\":\"1.22\"}", string(value))
+}
+
+func TestDecimal_UnmarshalJSON(t *testing.T) {
+	value := "{\"value\":\"1.22\"}"
+	d := new(Decimal)
+	err := json.Unmarshal([]byte(value), d)
+	testhelpers.AssertNoError(t, err)
+	testhelpers.Equals(t, "1.22", d.String())
+}