# Advanced User Guide { #advanced-user-guide }

## Additional Features { #additional-features }

The main [Tutorial - User Guide](../tutorial/index.md){.internal-link target=_blank} should be enough to give you a tour through all the main features of **FastAPI**.

In the next sections you will see other options, configurations, and additional features.

/// tip

The next sections are **not necessarily "advanced"**.

	var (
		buildNames    []string
		buildNamesMap = map[string]bool{}
		user, _       = schema.Parse(&tests.User{}, &sync.Map{}, db.NamingStrategy)
		stmt          = gorm.Statement{DB: db, Table: user.Table, Schema: user, Clauses: map[string]clause.Clause{}}
	)

	for _, c := range clauses {
		if _, ok := buildNamesMap[c.Name()]; !ok {

	"time"

	"gorm.io/gorm"
	"gorm.io/gorm/utils/tests"
)

type User struct {
	*gorm.Model
	Name      *string
	Age       *uint
	Birthday  *time.Time
	Account   *tests.Account
	Pets      []*tests.Pet
	Toys      []*tests.Toy `gorm:"polymorphic:Owner"`
	CompanyID *int
	Company   *tests.Company
	ManagerID *uint
	Manager   *User
	Team      []*User           `gorm:"foreignkey:ManagerID"`

        Files.createDirectories(mavenConf);
        Path mavenUserProps = mavenConf.resolve("maven.properties");
        Files.writeString(mavenUserProps, "${includes} = ?\"/user/ma ven.properties\",  ?/foo/bar\n");
        Path userDirectory = fs.getPath("/user");
        Files.createDirectories(userDirectory);
        Path propsPath = userDirectory.resolve("ma ven.properties");

async def create_item(item: Item):
    return item


@app.get("/items/", tags=["items"])
async def read_items():
    return [{"name": "Foo", "price": 42}]


@app.get("/users/", tags=["users"])
async def read_users():

	}{
		{"a b", "", "a b"},
		{"a b", "url", "a+b"},
		{"p- ", "url", "p-+"},
		{"p-%", "url", "p-%25"},
		{"p/", "url", "p/"},
		{"p/", "url", "p/"},
		{"~user", "url", "%7Euser"},
		{"*user", "url", "*user"},
		{"user+password", "url", "user%2Bpassword"},
		{"_user", "url", "_user"},
		{"firstname.lastname", "url", "firstname.lastname"},
	}
	for i, testCase := range testCases {

from fastapi import FastAPI

app = FastAPI()


@app.get("/items/", tags=["items"])
async def read_items():
    return [{"name": "Foo", "price": 42}]


@app.get("/users/", tags=["users"])
async def read_users():
    return [{"username": "johndoe"}]


@app.get("/elements/", tags=["items"], deprecated=True)
async def read_elements():

     * @return This request, never {@code null}.
     */
    SettingsBuildingRequest setUserSettingsFile(File userSettingsFile);

    /**
     * Gets the user settings source.
     *
     * @return The user settings source or {@code null} if none.
     */
    SettingsSource getUserSettingsSource();

    /**

from enum import Enum

from fastapi import FastAPI

app = FastAPI()


class Tags(Enum):
    items = "items"
    users = "users"


@app.get("/items/", tags=[Tags.items])
async def get_items():
    return ["Portal gun", "Plumbus"]


@app.get("/users/", tags=[Tags.users])
async def read_users():

### Die `APIRouter` für `users` und `items` inkludieren { #include-the-apirouters-for-users-and-items }

Inkludieren wir nun die `router` aus diesen Submodulen `users` und `items`:

{* ../../docs_src/bigger_applications/app_an_py39/main.py hl[10:11] title["app/main.py"] *}

/// info | Info

`users.router` enthält den `APIRouter` in der Datei `app/routers/users.py`.