Question

88

How to test for uniqueness of value in Yup.array?

rated 0 times [ 92] [ 4] / answers: 1 / hits: 22309 / 5 Years ago, tue, january 8, 2019, 12:00:00

I have form with dynamic amount of inputs (admin email) however checking for uniqueness fails:

      validationSchema={Yup.object().shape({

        adminEmails: Yup.array()

          .of(

            Yup.string()

              .notOneOf(Yup.ref('adminEmails'), 'E-mail is already used')

What is best approach here?
FYI, as a form helper I use Formik.

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ryderalfonsos

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answered 6 Years ago austynp · Accepted Answer

Try this:

Yup.addMethod(Yup.array, 'unique', function(message, mapper = a => a) {

    return this.test('unique', message, function(list) {

        return list.length  === new Set(list.map(mapper)).size;

    });

});

Then use it like this:

const headersSchema = Yup.object().shape({

    adminEmails: Yup.array().of(

        Yup.string()

    )

    .unique('email must be unique')

})