Class-validator: How to read the declared metadata on a field or prop ?

[binaryangel-noa]

Hi,

is there a way to get the initially declared Metadata on a decorator ?,
For example with the MaxLength decorator. MaxLength(255, { message: "somemessage" }) ,
i am looking for a way to retrive that 255 .

Thanks alot!

[LiamLB]

I'm also interested in this, I'm trying to generate forms with required fields using the @IsDefined decorator metadata.

[vlapo]

You have to use internal API to get this kind of data. Check a code and how internally class-validator works/store data you need.

[LiamLB]

Hey again,

I spent a bit of time looking at this today and the best I could come up with is the following:

import { getFromContainer, MetadataStorage } from 'class-validator';

const validatorStorage: MetadataStorage = getFromContainer(MetadataStorage);

const createUserDtoValidationMetadata = validatorStorage.getTargetValidationMetadatas(CreateUserDto, null, null);

console.log(validatorStorage.groupByPropertyName(createUserDtoValidationMetadata));

For reference here is what the CreateUserDto looks like:

export class CreateUserDto {
    @IsString({
        message: 'Name must be a text value'
    })
    name: string;
    @IsString({
        message: 'Surname must be a text value'
    })
    surname: string;
    @IsString()
    @IsOptional()
    password?: string;
    @IsEmail()
    email: string;
    @IsString()
    type: UserType;
    @IsOptional()
    @IsString()
    cellphoneNumber?: string;
}