fastest-validator: ensure that two fields are not the same

Question

fastest-validator: ensure that two fields are not the same

My current validation process involves using fastest-validator. Here is an example of the object being validated:

{
    "_id":"619e00c177f6ea2eccffd09f",
    "parent_id": "619e00c177f6ea2eccffd09f",
}

I need to ensure that _id and parent_id are not equal. How can I perform this check using fastest-validator? The library provides a method for validating equality, but I require the opposite behavior.

const schema = {
    password: { type: "string", min: 6 },
    confirmPassword: { type: "equal", field: "password" }
}
const check = v.compile(schema);

check({ password: "123456", confirmPassword: "123456" }); // Valid
check({ password: "123456", confirmPassword: "pass1234" }); // Fail

Any suggestions or insights regarding this matter would be greatly appreciated. Thank you in advance!

javascript express validation

Answer 1

Answer №1

Exploring the concept of Custom Validator Meta Information:

Utilizing additional meta information for custom validators can be accessed through context.meta.

Therefore, I have the ability to compare any pair of fields as needed. For instance, to compare _id and parent_id, the following approach can be implemented:

const v = new Validator({
    useNewCustomCheckerFunction: true,
    messages: {
        notEqual: "_id and parent_id cannot be identical"
    }
});

const editSchema = {
    _id: { type: "string" },
    parent_id: {
        type: "string",
        custom: (value, errors, schema, name, parent, context) =>{
            if (context.data._id === value) errors.push({type: "notEqual"})
            return value
        }
    }
};

Answer 2

Exploring the concept of Custom Validator Meta Information:

Utilizing additional meta information for custom validators can be accessed through context.meta.

Therefore, I have the ability to compare any pair of fields as needed. For instance, to compare _id and parent_id, the following approach can be implemented:

const v = new Validator({
    useNewCustomCheckerFunction: true,
    messages: {
        notEqual: "_id and parent_id cannot be identical"
    }
});

const editSchema = {
    _id: { type: "string" },
    parent_id: {
        type: "string",
        custom: (value, errors, schema, name, parent, context) =>{
            if (context.data._id === value) errors.push({type: "notEqual"})
            return value
        }
    }
};

fastest-validator: ensure that two fields are not the same

Answer №1

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