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javascriptjsonvalidationobjectjoi
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Reputation: 10564

How to allow exceptional value in Joi?

I am trying to validate a key in json object which should have value greater than another key's value. As exception I want to allow -1 also to be valid value. 

// valid because max is greater than min
var object1 = {
    min: 5,
    max: 7
}

// invalid because max is not greater than min
var object2 = {
    min: 5,
    max: 5
}

// invalid because max is not greater than min
var object3 = {
    min: 5,
    max: 3
}

// valid as exception we want to allow -1
var object4 = {
    min: 5,
    max: -1
}

var schema = Joi.object({
    min: Joi.number().integer(),
    max: Joi.number().integer().greater(Joi.ref('min'))                   
})

This schema is handling all case well except the exceptional case. how can I enhance my schema to cover exceptional case also.

Upvotes: 0

Views: 462

Answers (1)

Samuel Goldenbaum
Samuel Goldenbaum

Reputation: 18919

Just add allow(-1) to your max schema to allow the -1 value.

var schema = Joi.object({
    min: Joi.number().integer(),
    max: Joi.number().integer().allow(-1).greater(Joi.ref('min'))
});

Ref Docs

Tests:

const Joi = require('@hapi/joi');
const assert = require('assert');

var schema = Joi.object({
    min: Joi.number().integer(),
    max: Joi.number().integer().allow(-1).greater(Joi.ref('min'))
});

// valid because max is greater than min
var object1 = {
    min: 5,
    max: 7
};

assert.deepStrictEqual(schema.validate(object1).error, undefined);

// invalid because max is not greater than min
var object2 = {
    min: 5,
    max: 5
};

assert.notStrictEqual(schema.validate(object2).error, undefined);

// invalid because max is not greater than min
var object3 = {
    min: 5,
    max: 3
};

assert.notStrictEqual(schema.validate(object3).error, undefined);

// valid as exception we want to allow -1
var object4 = {
    min: 5,
    max: -1
};

assert.deepStrictEqual(schema.validate(object4).error, undefined);

Upvotes: 1

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