[PHP] [SymfonyServerCodegen] Bug: ignore all default values for Swagger\Server\Model

Description

Default values for input models dont filled.

Swagger-codegen version

java -jar swagger-codegen-cli.jar version
2.3.1

Swagger declaration file content or url

definitions:
  Description:
    type: object
    properties:
      description:
        type: string
        description: "Description"
        default: "Default Description"

Command line used for generation

java -jar swagger-codegen-cli.jar generate --input-spec test.yml --lang io.swagger.codegen.languages.SymfonyServerCodegen --output app/demo

Steps to reproduce

This generate file SwaggerServerBundle\Model\Description.php:

<?php

namespace Swagger\Server\Model;

use Symfony\Component\Validator\Constraints as Assert;
use JMS\Serializer\Annotation\Type;
use JMS\Serializer\Annotation\SerializedName;

/**
 * Class representing the Description model.
 *
 * @package Swagger\Server\Model
 * @author  Swagger Codegen team
 */
class Description 
{
        /**
     * Description
     *
     * @var string|null
     * @SerializedName("description")
     * @Assert\Type("string")
     * @Type("string")
     */
    protected $description;

    /**
     * Constructor
     * @param mixed[] $data Associated array of property values initializing the model
     */
    public function __construct(array $data = null)
    {
        $this->description = isset($data['description']) ? $data['description'] : 'Default Description';
    }


    /**
     * Gets description.
     *
     * @return string|null
     */
    public function getDescription()
    {
        return $this->description;
    }

    /**
     * Sets description.
     *
     * @param string|null $description  Description
     *
     * @return $this
     */
    public function setDescription($description = null)
    {
        $this->description = $description;

        return $this;
    }
}

But in Controller initiate by code:

$description = $this->deserialize($description, 'Swagger\Server\Model\Description', $inputFormat);

But this code create instance with reflection and newInstanceWithoutConstructor.
The class constructor is not called, in this case, and the default values are not filled!

Related issues/PRs

#8369

Suggest a fix/enhancement

Need to come up with another way to fill default values.

Start with the generated Swagger\Server\Model\Description.php and the controller deserialization call shown in the report. Compare the behavior with related issue #8369 and trace how deserialization bypasses the model constructor. Done means default values from the Swagger definition are populated when input models are deserialized.