[BUG] [php-symfony] constraint Valid cannot be nested

Created by: BenjaminHae

Bug Report Checklist

• Have you provided a full/minimal spec to reproduce the issue?
• Have you validated the input using an OpenAPI validator (example)?
• What's the version of OpenAPI Generator used?
• Have you search for related issues/PRs?
• What's the actual output vs expected output?
• [Optional] Bounty to sponsor the fix (example)

Description

When creating an requestBody that contains a schema with an Array of Object, the generated code for php-symfony raises an error when calling the associated operation. The error is:

The constraint Valid cannot be nested inside constraint Symfony\Component\Validator\Constraints\All. You can only declare the Valid constraint directly on a field or method.

openapi-generator version

dockerhub: latest

OpenAPI declaration file content or url

openapi: 3.0.0
info:
  description: Test
  version: 0.0.1
  title: Test
tags:
  - name: test
    description: test
paths:
  /test:
    put:
      tags:
        - test
      summary: test
      operationId: test
      requestBody:
        content:
          application/json:
            schema:
              $ref: "#/components/schemas/TestArray"
        required: true
      responses:
        "200":
          description: successful operation
components:
  schemas:
    TestObject:
      type: object
      properties:
        name:
          type: string
    TestArray:
      type: array
      items:
        $ref: "#/components/schemas/TestObject"

Command line used for generation

docker run --rm -v ${PWD}:/local openapitools/openapi-generator-cli:latest generate -i /local/OpenAPIDescription.yaml -g php-symfony -o /local/OpenAPIServerBundle

Steps to reproduce

Generate the code from the declaration above. Use it in a symfony project(current stable version 4.3), implement the interfaces, empty methods are ok. Run http PUT against /test.

Related issues/PRs

Suggest a fix

The relevant lines in the generated code are in OpenAPI\Server\Controller\TestController.testAction

$asserts = [];
$asserts[] = new Assert\NotNull();
$asserts[] = new Assert\All([
    new Assert\Type("OpenAPI\Server\Model\TestObject"),
    new Assert\Valid(),
]);

Removing the new Assert\Valid() line fixes it. Moving it to the bottom as in the following example also works:

$asserts = [];
$asserts[] = new Assert\NotNull();
$asserts[] = new Assert\All([
    new Assert\Type("OpenAPI\Server\Model\TestObject"),
]);
$asserts[] = new Assert\Valid(),

I don't know however whether this achieves the desired validation.