How to check if at least one of the properties have a value?

[henriqueleite42]

I have the following class:

export class Foo {
	@IsOptional()
	@IsTrue()
	foo?: boolean;

	@IsOptional()
	@IsTrue()
	bar?: boolean;

	@IsOptional()
	@IsTrue()
	fooBar?: boolean;

	@IsOptional()
	@IsTrue()
	barFoo?: boolean;

	// Another 100 fields exactly equal the previous one
}

Is there a way to check if at least one of the properties has a value, and if no, throw an error?

Example:

{} // error
{foo: true} // success
{foo: false} //success

[henriqueleite42]

The discussion will continue on #1782