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[QueryParameter] Support PHP backed enums in OpenAPI schemas

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难度
4/5
预计耗时
3-5 天
新手友好度
35/100
Issue 类型
功能
描述清晰度
基本清楚
活跃度
活跃
技术栈
php
领域
api

调研方向

Start with how QueryParameter schemas are turned into OpenAPI output and how query values are validated, since the payload names neither file nor test. Check whether the existing enum handling for resource properties can be reused for a QueryParameter schema that names an enum class. The syntax is still open (a 'enumClass' key inside schema, or a dedicated option), so agree on it with maintainers first. Done means the generated schema lists the backed enum's values and incoming values are validated against them.

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描述

Description

In API Platform 4.4 / 5.0, defining a QueryParameter with allowed values from a PHP backed enum requires manually duplicating its values in the OpenAPI schema.

For example:

enum FooEnum: string
{
    case A = 'a';
    case B = 'b';
    case C = 'c';
}

Currently, the values must be explicitly listed:

new QueryParameter(
    schema: [
        'type' => 'string',
        'enum' => ['a', 'b', 'c'],
    ],
)

This duplicates the enum definition and requires updating the schema whenever enum cases change.

PHP does not allow calling FooEnum::cases() directly in attribute arguments.

Proposed solution

Allow referencing a PHP backed enum class directly in a QueryParameter schema.

For example:

new QueryParameter(
    schema: [
        'type' => 'string',
        'enumClass' => FooEnum::class,
    ],
)

Alternatively, a dedicated enumClass option on QueryParameter could be introduced.

The syntax is illustrative; the goal is to avoid manually duplicating enum values.

Expected behavior

API Platform should automatically:

  • Extract backed enum values using FooEnum::cases().
  • Include these values in the generated OpenAPI schema.
  • Validate incoming parameter values against the enum.

Generated OpenAPI schema:

type: string
enum:
  - a
  - b
  - c

Automatic conversion to PHP enum instances is not required as part of this feature.

Additional context

API Platform already supports PHP backed enums in resource properties and OpenAPI schema generation.

It would be useful to provide equivalent support for explicitly declared query parameters, keeping the enum as the single source of truth.

主要语言
PHP
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派生
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环境准备

从这里开始

  1. 先读完整个 Issue,再读项目的贡献指南。
  2. 在 Issue 下留言说明你要接手 —— 这能避免两个人做同样的事。
  3. Fork 仓库,在一个分支上完成修改。
  4. 提交 Pull Request,并在描述里引用这个 Issue 编号。

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