How can I use Dynamic key in Joi

Question

I am a beginner in Joi.

I want to make the following 'folderContent' a dynamic value, it can be 'onlySubject' or 'otherDetails' or whatever I will give as input during runtime.

Details: In the schema('bodySchema') , there is a object ('superObject')under which there is another object ('folderContent'), within that there is a string ('subject')

const bodySchema=Joi.object({
superObject: Joi.object()
    .when('grade', {
      is: 'class6',
      then: {
        folderContent: Joi.object({
            subject: Joi.string(),
          }),
      },
    })
});

So the input looks like the following where instead of 'folderContent' I want to give dynamic key value

"superObject": {
        "folderContent": {
            "subject": "Geography"
        }
    }

I have tried the followings, but did not work: 1)superObject: Joi.object() .when('grade', { is: 'class6', then: {

    folderContent: Joi.object()
      .keys({
        subject: Joi.string(),
      })
      .unknown(true),
    
  },
})

2)superObject: Joi.object() .when('grade', { is: 'class6', then: {

    folderContent: Joi.object()
      ({
        subject: Joi.string(),
      })
      .unknown(true),
    
  },
})

Error is coming when I give input as 'onlySubject' for 'folderContent' { "success": false, "exception": "InvalidBodyParameters", "message": ""superObject.onlySubject" is not allowed", "stack": "ValidationError: "superObject.onlySubject" is not allowed" }

Answer 1

Got it, the following is working fine. With the help of your pattern it worked, thank you so much.

superObject
: Joi.object()

    .when(‘grade’, {
      is: ‘class6’,
      then: Joi.object().pattern(
        Joi.string(),
        Joi.object({
          subject: Joi.string(),
        })
      ),
    })
    .when(‘grade’, {
      is: ‘class5’,
      then: Joi.object().pattern(
        Joi.string(),
        Joi.object({
          subject: Joi.string(),
          Pattern: Joi.string(),
        })
      ),
    }),