question: how to validate 2D arrays?

Hello,

I have something like this

@Type is from class-transformer. I tried to search for the issues but I could not find anything.

export class Child {
  @IsDefined()
  @IsString()
  @IsNotEmpty()
  name: string;
}

export class Parent {
  @IsArray()
  @IsNotEmpty()
  @Type((type) => Child)
  @ValidateNested()
  children: Child[][];
}

const parent = new Parent();
let res;
// I need `as any` because I'm using strictNullChecks
parent.children= 123 as any; 
res = validateSync(parent); // this fails

parent.children= [] as any; 
res = validateSync(parent); // this passes

parent.children= [[]] as any; 
res = validateSync(parent); // this passes

parent.children= [[ { name: null } ]] as any;
res = validateSync(parent);  // this passes

Even if the type Child is changed to JS native types like number or string. How can I validate something like this?

[MarkMurphy]

Currently we do not have support for multidimensional arrays. You have to create your own custom validator.

Not really sure how that would work, can you point us in the right direction here?

[NoNameProvided]

As mentioned by others, you can use a custom validator for this.