Symfony nested constraints don't work properly - php

Question

I came across a strange problem with Symfony validation.
Seems that "nested" constraints don't work properly.
For example, I create a string variable $data which needs to be validated.
$data = 'string';
$constraint = new Assert\Type('integer');
$violations = $validator->validate($data, $constraint);
self::assertTrue($violations->count() > 0);
In this case it works properly. We pass the string variable to the constraint which allows only integer. But if I create "nested" constraint the test won't pass.
$data = 'string';
$constraint = new Assert\Required([
new Assert\Type('integer'),
]);
$violations = $validator->validate($data, $constraint);
self::assertTrue($violations->count() > 0);
In this case the test is failed. The validator doesn't find any violations.
Is it a bug? Or do I do something wrong?

Answer 1

if you want your data to be not empty (required) and to be a number:
$data = 'string';
$validator = Validation::createValidator();
$violations = $validator->validate($data, [
new NotBlank(),
new Type(['integer'),
]);
see https://symfony.com/doc/current/components/validator.html

Answer 2

There is no Assert\Required constraint.
Since Symfony 5.4 you can use Attributes to combine constraints:
#[Assert\All([
new Assert\NotNull(),
new Assert\Range(min: 3),
])]
or
#[Assert\Collection(
fields: [
'foo' => [
new Assert\NotNull(),
new Assert\Range(min: 3),
],
'bar' => new Assert\Range(min: 5),
'baz' => new Assert\Required([new Assert\Email()]),
]
)]
https://symfony.com/blog/new-in-symfony-5-4-nested-validation-attributes