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zod parsing bug about zod HOT 2 OPEN

realtebo commented on July 20, 2024 4

zod parsing bug

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Comments (2)

realtebo commented on July 20, 2024 1

I installed zod-to-ts to diagnose the problem.

Actually, having used coerce for the boolean, every missing property is mapped as a boolean false. and the ts types are all optionals (there is a ? added after the field name in every coerced field)

We resolved using discriminatedUnion, thanks for the tip!

I kindly suggest to add a tip in the documentation about this behaviour.

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eswarty commented on July 20, 2024

Hi! Not totally sure what is causing the problem with the union type, but I think a discriminated union might work instead, e.g.:

const hammamAlarmEventFieldDataPayloadSchema = z.object({
  type: z.literal("hamman"),
  BoilerFullTooSoon: z.coerce.boolean(),
  EvLoad: z.coerce.boolean(),
  EvDrain: z.coerce.boolean(),
  VinBus: z.coerce.boolean(),
  Ntc: z.coerce.boolean(),
  Fan: z.coerce.boolean(),
  Slave: z.coerce.boolean(),
  HeaterFail: z.coerce.boolean(),
  Capacitive: z.coerce.boolean(),
  CabTemp: z.coerce.boolean(),
  Door: z.coerce.boolean(),
});

const saunaAlarmEventFieldDataPayloadSchema = z.object({
  type: z.literal("sauna"),
  StoveTemp: z.coerce.boolean(),
  VinBus: z.coerce.boolean(),
  Ntc: z.coerce.boolean(),
  ThermalProtection: z.coerce.boolean(),
  CabTemp: z.coerce.boolean(),
  Potentiometer: z.coerce.boolean(),
});

const eccIotInfoSchema = z.object({
  Id: z.string(),
  Ts: z.coerce.date(),
  Type: z.nativeEnum(FieldDataType),
  HostId: z.string(),
  Payload: z.discriminatedUnion("type", [
    saunaAlarmEventFieldDataPayloadSchema,
    genericAlarmEventFieldDataPayloadSchema,
    hammamAlarmEventFieldDataPayloadSchema,
  ]),
});


export const rawEventFieldDataSchema = z.object({
  App: z.string(),
  Cat: z.nativeEnum(EventCategory),
  EccIOTEvent: eccIotInfoSchema,
});

export type RawEventFieldData = z.infer<typeof rawEventFieldDataSchema>;
const body = {
    App: "EccIOT",
    Cat: "Event",
    EccIOTEvent: {
      Id: "ecc-D8E39657C",
      Ts: "2020/02/28 10:14:10",
      Type: "HAlarm",
      HostId: "0A229332",
      Payload: {
        type: "hamman",
        BoilerFullTooSoon: 0,
        EvLoad: 0,
        EvDrain: 0,
        VinBus: 0,
        Ntc: 0,
        Fan: 0,
        Slave: 0,
        HeaterFail: 0,
        Capacitive: 0,
        CabTemp: 0,
        Door: 0,
      },
    },
  };

  const rawData: RawEventFieldData = rawEventFieldDataSchema.parse(body);

  console.log(rawData);

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