"content": {"application/json": {"schema": {}}},
                        },
                        "422": {
                            "description": "Validation Error",
                            "content": {
                                "application/json": {
                                    "schema": {
                                        "$ref": "#/components/schemas/HTTPValidationError"

                            "content": {"application/json": {"schema": {}}},
                        },
                        "422": {
                            "description": "Validation Error",
                            "content": {
                                "application/json": {
                                    "schema": {
                                        "$ref": "#/components/schemas/HTTPValidationError"

### Generate the OpenAPI schema

Then, use the same utility function to generate the OpenAPI schema, inside a `custom_openapi()` function:

{* ../../docs_src/extending_openapi/tutorial001.py hl[2,15:21] *}

### Modify the OpenAPI schema

Now you can add the ReDoc extension, adding a custom `x-logo` to the `info` "object" in the OpenAPI schema:

{* ../../docs_src/extending_openapi/tutorial001.py hl[22:24] *}

                            "schema": {"type": "integer", "title": "Item Id"},
                            "name": "item_id",
                            "in": "path",
                        }
                    ],
                    "requestBody": {
                        "content": {
                            "application/json": {
                                "schema": {"$ref": "#/components/schemas/Item"}

	}

	checkStructRelation(t, &User{}, Relation{
		Name: "Creators", Type: schema.HasMany, Schema: "User", FieldSchema: "User",
		References: []Reference{{"ID", "User", "CreatedBy", "User", "", true}},
	})

	user, err := schema.Parse(&User{}, &sync.Map{}, schema.NamingStrategy{})
	if err != nil {
		t.Fatalf("failed to parse schema")
	}

	relSchema := user.Relationships.Relations["Creators"].FieldSchema

			cacheStore.Store(embeddedCacheKey, true)
			if field.EmbeddedSchema, err = getOrParse(fieldValue.Interface(), cacheStore, embeddedNamer{Table: schema.Table, Namer: schema.namer}); err != nil {
				schema.err = err
			}

			for _, ef := range field.EmbeddedSchema.Fields {
				ef.Schema = schema
				ef.OwnerSchema = field.EmbeddedSchema
				ef.BindNames = append([]string{fieldStruct.Name}, ef.BindNames...)

                            "required": True,
                            "schema": {"type": "integer", "title": "Item Id"},
                        }
                    ],
                    "requestBody": {
                        "required": True,
                        "content": {
                            "application/json": {
                                "schema": {"$ref": "#/components/schemas/Item"}
                            }

                            "content": {"application/json": {"schema": {}}},
                        },
                        "422": {
                            "description": "Validation Error",
                            "content": {
                                "application/json": {
                                    "schema": {
                                        "$ref": "#/components/schemas/HTTPValidationError"

**FastAPI**将采用该模型，生成其`JSON Schema`并将其包含在`OpenAPI`中的正确位置。

例如，要声明另一个具有状态码 `404` 和`Pydantic`模型 `Message` 的响应，可以写：
```Python hl_lines="18  22"
{!../../docs_src/additional_responses/tutorial001.py!}
```

/// note

请记住，您必须直接返回 `JSONResponse` 。

///

/// info

`model` 密钥不是OpenAPI的一部分。
**FastAPI**将从那里获取`Pydantic`模型，生成` JSON Schema` ，并将其放在正确的位置。
- 正确的位置是：

                            "required": True,
                            "schema": {"title": "Item Id", "type": "string"},
                            "name": "item_id",
                            "in": "path",
                        },
                        {
                            "required": False,
                            "schema": IsDict(
                                {