Is Joi's existence a myth?

Question

Is Joi's existence a myth?

I've been using Joi for validation, and I've encountered a situation that I'm having trouble with. I have an object that sometimes includes an id field (for editing) and other times it doesn't (for creating).

My goal is to validate that when the "id" field is not present, certain other fields must be included.

Currently, the only solution that works for me is when the id is null but still exists in the object. Is there a way to handle a non-existing key without resorting to setting it to null (which feels like a hack)?

joi.object().keys({
  id: joi
    .number()
    .min(0)
    .allow(null),
  someOtherField1: joi.when("id", { is: null, then: joi.required() })
});

Any help or advice on this matter would be greatly appreciated!

javascript typescript validation joi

Answer 1

Answer №1

Not defined represents an empty value in Joi. Replace "is" with "not"

For instance:

{ not: Joi.exist(), then: Joi.required() }

Answer 2

Not defined represents an empty value in Joi. Replace "is" with "not"

For instance:

{ not: Joi.exist(), then: Joi.required() }

Answer 3

Answer №2

If you're open to considering null as an identifier and would like to apply conditions to it, my recommendation is to set the identifier field's default value to null. This way, you can exclude it from the data payload and still handle it using Joi.when().

Here's an example:

Joi.object().keys({
    identifier: Joi.number().min(0).allow(null).default(null),
    someOtherField1: Joi.string().when('identifier', { is: null, then: Joi.required() })
});

Providing both an empty object, {}, and an object with a null identifier, { "identifier": null }, will lead to:

ValidationError: child "someOtherField1" fails because ["someOtherField1" is required]

Answer 4

If you're open to considering null as an identifier and would like to apply conditions to it, my recommendation is to set the identifier field's default value to null. This way, you can exclude it from the data payload and still handle it using Joi.when().

Here's an example:

Joi.object().keys({
    identifier: Joi.number().min(0).allow(null).default(null),
    someOtherField1: Joi.string().when('identifier', { is: null, then: Joi.required() })
});

Providing both an empty object, {}, and an object with a null identifier, { "identifier": null }, will lead to:

ValidationError: child "someOtherField1" fails because ["someOtherField1" is required]

Is Joi's existence a myth?

Answer №1

Answer №2

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