Validation of a Joi field based on a specific list of options in another field

Question

Validation of a Joi field based on a specific list of options in another field

I need to validate a field within an object based on specific values in another field. Let's say I have two fields, field1 and field2. The possible values for field1 are A, B, C, D, E, F, H, I. If field1 has the value of A, B, or C, then field2 should be null. How can I achieve this? I believe the syntax should be similar to the example below, but I'm not sure how to implement it correctly.

const mySchema = Joi.object({
   field1: Joi.string().valid('A','B','C','D','E','F','H','I').required(),
   field2: Joi.when('field1', is: <A or B or C or H> then: <field2 should be null> otherwise: Joi.date().required())
});

Note: I am working with "@hapi/joi": "^17.1.1"

node.js express validation switch-statement joi

Answer 1

Answer №1

After some trial and error, I was able to figure it out using the following code:

const Joi = require("@hapi/joi");

const schema = Joi.object({
    field1: Joi.string().valid('A', 'B', 'C', 'D', 'E', 'F', 'H', 'I').required(),
    field2: Joi.when('field1', {
        is: Joi.string().valid('A', 'B', 'C', 'H'),
        then: Joi.valid(null),
        otherwise: Joi.date().required(),
    }),
});

const validation = [schema.validate({ field1: 'B', field2: null }), schema.validate({ field1: 'E', field2: null }),
                    schema.validate({ field1: 'E', field2: Date() }), schema.validate({ field1: 'A', field2: Date() })];

validation.forEach((v)=>{
    if(v.error){
        console.log(JSON.stringify(v.error));
    }else{
        console.log(JSON.stringify(v.value));
    }
});

The results of the output are shown below:

{"field1":"B","field2":null}
{"_original":{"field1":"E","field2":null},"details":[{"message":"\"field2\" must be a valid date","path":["field2"],"type":"date.base","context":{"label":"field2","value":null,"key":"field2"}}]}
{"field1":"E","field2":"2020-05-20T12:26:48.000Z"}
{"_original":{"field1":"A","field2":"Wed May 20 2020 13:26:48 GMT+0100 (West Africa Standard Time)"},"details":[{"message":"\"field2\" must be [null]","path":["field2"],"type":"any.only","context":{"valids":[null],"label":"field2","value":"Wed May 20 2020 13:26:48 GMT+0100 (West Africa Standard Time)","key":"field2"}}]}

Answer 2

After some trial and error, I was able to figure it out using the following code:

const Joi = require("@hapi/joi");

const schema = Joi.object({
    field1: Joi.string().valid('A', 'B', 'C', 'D', 'E', 'F', 'H', 'I').required(),
    field2: Joi.when('field1', {
        is: Joi.string().valid('A', 'B', 'C', 'H'),
        then: Joi.valid(null),
        otherwise: Joi.date().required(),
    }),
});

const validation = [schema.validate({ field1: 'B', field2: null }), schema.validate({ field1: 'E', field2: null }),
                    schema.validate({ field1: 'E', field2: Date() }), schema.validate({ field1: 'A', field2: Date() })];

validation.forEach((v)=>{
    if(v.error){
        console.log(JSON.stringify(v.error));
    }else{
        console.log(JSON.stringify(v.value));
    }
});

The results of the output are shown below:

{"field1":"B","field2":null}
{"_original":{"field1":"E","field2":null},"details":[{"message":"\"field2\" must be a valid date","path":["field2"],"type":"date.base","context":{"label":"field2","value":null,"key":"field2"}}]}
{"field1":"E","field2":"2020-05-20T12:26:48.000Z"}
{"_original":{"field1":"A","field2":"Wed May 20 2020 13:26:48 GMT+0100 (West Africa Standard Time)"},"details":[{"message":"\"field2\" must be [null]","path":["field2"],"type":"any.only","context":{"valids":[null],"label":"field2","value":"Wed May 20 2020 13:26:48 GMT+0100 (West Africa Standard Time)","key":"field2"}}]}

Validation of a Joi field based on a specific list of options in another field

Answer №1

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