question: How to create Conditional Custom Validation?

Here is my DTO:

export class ApplyCashbackDto {
@IsNotEmpty()
promoCode: string

// Conditional Validation
extras: string
}

I was trying to conditionally validate the extras property based on promoCode property, but i have to check first to the DB if the promoCode need some extras data because not all the promoCode must include the extras property

How to achieve this custom coditional validation?

[dennbagas]

Hi @NickKelly1

Yes, i can create custom async validator, but that wasn’t an optional validator. Its like regular validator that validate the value is right or not.

What i want is a custom optional async validation. Something like @ValidateIf() but async version

[github-actions[bot]]

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