"requestBody": {
                            "content": {
                                "application/json": {
                                    "schema": {
                                        "$ref": "#/components/schemas/Item",
                                    }
                                }
                            },
                            "required": True,

    * 一个媒体类型作为键，例如 `application/json`，它的值是另一个 JSON 对象，该对象包含：
        * 一个键 `schema`，它的值是来自该模型的 JSON Schema，这里就是正确的位置。
            * **FastAPI** 会在这里添加一个引用，指向你 OpenAPI 中另一个位置的全局 JSON Schemas，而不是直接内联。这样，其他应用和客户端可以直接使用这些 JSON Schemas，提供更好的代码生成工具等。

///

为该*路径操作*在 OpenAPI 中生成的响应将是：

```JSON hl_lines="3-12"
{
    "responses": {
        "404": {
            "description": "Additional Response",
            "content": {

                                "content": {
                                    "application/json": {
                                        "schema": {
                                            "$ref": "#/components/schemas/ModelWithRef"
                                        }
                                    }
                                },
                            }

                                "schema": {"title": "Item Id", "type": "string"},
                                "name": "item_id",
                                "in": "path",
                            }
                        ],
                    }
                },
            },
            "components": {
                "schemas": {
                    "ValidationError": {

                }
            },
            "components": {
                "schemas": {
                    "HTTPValidationError": {
                        "properties": {
                            "detail": {
                                "items": {
                                    "$ref": "#/components/schemas/ValidationError"
                                },
                                "type": "array",

            "components": {
                "schemas": {
                    "Body_create_product_products_post": {
                        "title": "Body_create_product_products_post",
                        "required": ["data"],
                        "type": "object",
                        "properties": {
                            "data": {"$ref": "#/components/schemas/Product"}
                        },

                                "description": "Successful Response",
                                "content": {
                                    "application/json": {
                                        "schema": {"$ref": "#/components/schemas/User"}
                                    }
                                },
                            }
                        },
                    }
                },

    ["/required-str", "/model-required-str"],
)
def test_required_str_schema(path: str):
    openapi = app.openapi()
    body_model_name = get_body_model_name(openapi, path)

    assert app.openapi()["components"]["schemas"][body_model_name] == {
        "properties": {
            "p": {"title": "P", "type": "string"},
        },
        "required": ["p"],
        "title": body_model_name,
        "type": "object",
    }

        "/optional-list-uploadfile",
    ],
)
def test_optional_list_schema(path: str):
    openapi = app.openapi()
    body_model_name = get_body_model_name(openapi, path)

    assert app.openapi()["components"]["schemas"][body_model_name] == {
        "properties": {
            "p": {
                "anyOf": [
                    {
                        "type": "array",
                        "items": {

                            "content": {
                                "application/json": {
                                    "schema": {"$ref": "#/components/schemas/Item"}
                                }
                            },
                            "required": True,
                        },
                    },
                    "options": {
                        "responses": {