IsOptional support for null

I’m not sure whether this is part of as conditional decorator limitations in the readme. In any case…

The @IsOptional decorator should be adding anyOf: [{type: someType}, {type: 'null'}] as well as removing the property from the required array. It doesn’t seem to be doing the former.

I note that internally, class validator uses conditionalValidation for the IsOptional decorator. Am I correct that the limitation is that this doesn’t work when there are multiple decorators for one field? For example:

@IsOptional()
@IsNumber()
thing: number

@IsOptional()
@IsSting()
otherThing: string

The functionality of IsOptional depends on the other decorators.

[loban]

Personally, I don’t think @IsOptional should automatically allow null on a property that perhaps has other validations. Null is a very specific value that can have meaning. I always understood @IsOptional to mean if the property exists, then ensure it follows the other validations, and if it doesn’t exist, that’s ok.

This is especially relevant when I’m implementing a PATCH API call where all properties in the body are optional, but each must pass some validation if included, and null is a valid value for a property.

[incompletude]

Hello,

Any news on this? How can i validate or null or enum?

This doesn’t work.

  @IsOptional()
  @IsEnum(["c", "a", "r"], { each: true })
  @Transform((value: string) => value.split(","))
  status: string[]