Multiple alternatives with default

[2j2e]

Imagine than we have a,b,c fields.

a: Joi.string().required(),
b: Joi.any()
    .when('a', {is: 'Other', then: Joi.any(), otherwise: Joi.string().required()}),
c: Joi.alternatives()
    .when('a', {is: 'Other', then: Joi.string().required()})
    .when('b', {is: 'Other', then: Joi.string().required()})

a - is always required.
b - required only if a != 'Other'
c - required only if a == 'Other' OR b == 'Other'

If none of c rules has been applied c should be optional()
How should I rebuild my schema to get last rule working?

[Marsup]

This is currently a bug I meant to tackle a while ago.

[Marsup]

Sorry for the delay, fix is finally published.
Final schema could look like :

const schema = Joi.object({
    a: Joi.string().required(),
    b: Joi.when('a', { is: 'Other', otherwise: Joi.string().required() }),
    c: Joi.string()
        .when('a', { is: 'Other', then: Joi.required() })
        .when('b', { is: 'Other', then: Joi.required() })
});

As you can see from b and c, type of the alternative can be inside or outside whether you want it to be a string anyway, your choice.

[oguzhannkayaa]

My project is almost same as yours. But in my project a is array. When I wrote a: Joi.array().required(),
other conditions does not work. But when I do a: Joi.string().required() it works perfectly. How can I convert it to array?

[Marsup]

Stop spamming dude and open your own issue.