object.pattern() is not working correctly inside array.items() in Joi

问题

I am trying to validate nested object whose keys should match with outer objects another key whose value is array using Joi
I tried to use object.pattern and array.length which is demonstrated at How to validate nested object whose keys should match with outer objects another key whose value is array using Joi?

But that is not working with array.items()

var object = {
    details:[{
        key1: 'someValue',
        key2: 'someValue',
        key3: 'someValue'
    },{
        key1: 'someValue',
        key2: 'someValue',
        key3: 'someValue'
    }],
    keys: ['key1', 'key2', 'key3']
}

var schema = Joi.object({
    keys: Joi.array().length(Joi.ref('details', {adjust: (value) => Object.keys(value).length})),
    details: Joi.array().items(Joi.object().pattern(Joi.in('keys'), Joi.string()))
})

console.log(schema.validate(object)) // this should not give error but I am getting error

I am getting error

{ value:
   { details: [ [Object], [Object] ],
     keys: [ 'key1', 'key2', 'key3' ] },
  error:
   { ValidationError: "details[0].key1" is not allowed
     _original: { details: [Array], keys: [Array] },
     details: [ [Object] ] } }

How to make this validation working without hardcoding keys?

回答1:

Joi.ref('details', {adjust: (value) => Object.keys(value).length}),

Problem - Here value refers the details which is an array. So Object.keys(<details-array>).length won't work as expected

solution - map value array with Object.keys().length and use the maximum as given below

Joi.object().pattern(Joi.in('keys'), Joi.string()),

Problem - keys refers the sibling of details

solution - add / as prefix which is root of object

var schema = Joi.object({
  details: Joi.array().items(Joi.object().pattern(Joi.in('/keys'), Joi.string())),
  keys: Joi.array().length(
    Joi.ref('details', {
      adjust: value => {
        return Math.max(...value.map(o => Object.keys(o).length));
      }
    })
  )
});

stackblitz

Reference

https://github.com/hapijs/joi/blob/master/API.md#Relative-references

来源：https://stackoverflow.com/questions/58876986/object-pattern-is-not-working-correctly-inside-array-items-in-joi

标签

javascript