CODEWITHSUNDEEP
node.jsjoi
Combustible Pizza
Combustible Pizza

Reputation: 325

HapiJS/Joi Allow field to be String or Object with specific keys

I'm trying to validate a POST request where the title can be a String or an Object with language keys and values. Example:

{
    title: 'Chicken',
    ...
}
//OR
{
    title: {
        en_US: 'Chicken',
        de_DE: 'Hähnchen'
    }
    ...
}

And with Joi I'm trying to validate like so:

{
   title: Joi.any().when('title', {
        is: Joi.string(),
        then: Joi.string().required(),
        otherwise: Joi.object().keys({
            en_US: Joi.string().required(),
            lt_LT: Joi.string()
        }).required()
    }),
...
}

However, when I try to validate I get the error AssertionError [ERR_ASSERTION]: Item cannot come after itself: title(title) Is there a way to use when with the same field?

Upvotes: 9

Views: 14346

Answers (1)

Ankh
Ankh

Reputation: 5738

Take a look at using .alternatives() rather than .when() for this situation. .when() is better used when the value of your key is dependant on another key's value within the same object. In your scenario, we've only got the one key to worry about.

A possible solution using .alternatives() could look like:

Joi.object().keys({
    title: Joi.alternatives(
        Joi.string(),
        Joi.object().keys({
            en_US: Joi.string().required(),
            lt_LT: Joi.string()
        })
    ).required()
})

Upvotes: 29

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