Zod•5mo ago

ménard - I'm thinking of something like:typesc...

Hi, is there a way without going out of band to make one field always have the same value as another even when it's not part of the input object? I'm thinking of something like:

const vpm = z.object({
    leader: z.number(),
    follower: z.getsItsValueFrom('leader')
    // ...
});

vpm.safeParse({leader: 123}) // { data: { leader: 123, follower: 123 } }

const vpm = z.object({
    leader: z.number(),
    follower: z.getsItsValueFrom('leader')
    // ...
});

vpm.safeParse({leader: 123}) // { data: { leader: 123, follower: 123 } }

4 Replies

Svish•5mo ago

If it's always the same value, then it doesn't really make sense to me to even have it in the input. If it's necessary in the output, I would just add it with a transform on the object.

.transform(obj => ({
  ...obj,
  follower: o.leader,
}))

.transform(obj => ({
  ...obj,
  follower: o.leader,
}))

ménard•5mo ago

It's not supposed to be in the input. 🙂 I'll try using .transform like that.

    const vpm = z
        .object({
            leader: z.number(),
        })
        .transform((obj) => ({
            ...obj,
            follower: obj.leader,
        }));
    it('leader and follower 001', () => {
        const ret = vpm.safeParse({ leader: 123 });

        expect(ret.success).toBe(true);
        expect(ret.data?.leader).toBe(123);
        expect(ret.data?.follower).toBe(123);
    });

    const vpm = z
        .object({
            leader: z.number(),
        })
        .transform((obj) => ({
            ...obj,
            follower: obj.leader,
        }));
    it('leader and follower 001', () => {
        const ret = vpm.safeParse({ leader: 123 });

        expect(ret.success).toBe(true);
        expect(ret.data?.leader).toBe(123);
        expect(ret.data?.follower).toBe(123);
    });

it does exactly what I hoped it would Thanks, @Svish

Svish•5mo ago

Cool. Not sure I'd bother writing a unit test for that though 😛

ménard•5mo ago

Haha I write tests to check my understanding of programming language and library features all the time

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ménard - I'm thinking of something like:typesc...