I have a array of objects that looks like this
[{
name: 'some name'
catId: 2,
}, {
name: 'another name'
catId: 3,
}]
How can I validate using class-validator so that the name field is required and minimum 2 chars long in each object?
Thanks
To validate an array of items, you need to use @ValidateNested({ each: true })
.
A complete example:
import { validate, IsString, MinLength, ValidateNested } from 'class-validator';
class MySubClass {
@IsString()
@MinLength(2)
public name: string;
constructor(name: string ){
this.name = name;
}
}
class WrapperClass {
@ValidateNested({ each: true })
public list: MySubClass[];
constructor(list: MySubClass[]) {
this.list = list;
}
}
const subClasses = Array(4)
.fill(null)
.map(x => new MySubClass('Test'))
subClasses[2].name = null;
const wrapperClass = new WrapperClass(subClasses);
const validationErrors = await validate(wrapperClass);
This will log a validation error for subClasses[2]
as expected.