The `APIRouter`s are not "mounted", they are not isolated from the rest of the application.

This is because we want to include their *path operations* in the OpenAPI schema and the user interfaces.

As we cannot just isolate them and "mount" them independently of the rest, the *path operations* are "cloned" (re-created), not included directly.

///

## Check the automatic API docs

Now, run your app:

<div class="termy">

		t.Errorf("got %s; want %s", toJSONString(got), toJSONString(want))
	}
}

func TestManyToManyPreloadWithMultiPrimaryKeys(t *testing.T) {
	if name := DB.Dialector.Name(); name == "sqlite" || name == "sqlserver" {
		t.Skip("skip sqlite, sqlserver due to it doesn't support multiple primary keys with auto increment")
	}

	type (
		Level1 struct {
			ID           uint   `gorm:"primary_key;"`

Sie können das unter <a href="http://127.0.0.1:9999/api/v1/docs" class="external-link" target="_blank">http://127.0.0.1:9999/api/v1/docs</a> testen:

<img src="/img/tutorial/behind-a-proxy/image02.png">

Genau so, wie wir es wollten. ✔️

Dies liegt daran, dass FastAPI diesen `root_path` verwendet, um den Default-`server` in OpenAPI mit der von `root_path` bereitgestellten URL zu erstellen.

## Zusätzliche Server

/// warning | "Achtung"

		return nil, err
	}

	partInfosInQuorum := make([]ObjectPartInfo, len(partMetaPaths))
	for pidx := range partMetaPaths {
		// partMetaQuorumMap uses
		//  - path/to/part.N as key to collate errors from failed drives.
		//  - part ETag to collate part metadata
		partMetaQuorumMap := make(map[string]int, len(partNumbers))
		var pinfos []*ObjectPartInfo
		for idx := range disks {
			if len(objectPartInfos[idx]) != len(partMetaPaths) {

	sql = strings.ReplaceAll(sql, `'`, `"`)

	// convert dialect special quote into double quote
	switch DB.Dialector.Name() {
	case "postgres":
		sql = strings.ReplaceAll(sql, `"`, `"`)
	case "mysql", "sqlite":
		sql = strings.ReplaceAll(sql, "`", `"`)
	case "sqlserver":
		sql = strings.ReplaceAll(sql, `'`, `"`)
	}

	return sql

# Virtual Environments

When you work in Python projects you probably should use a **virtual environment** (or a similar mechanism) to isolate the packages you install for each project.

/// info

If you already know about virtual environments, how to create them and use them, you might want to skip this section. 🤓

///

/// tip

A **virtual environment** is different than an **environment variable**.

---

"_Wat je hebt gebouwd ziet er echt super solide en gepolijst uit. In veel opzichten is het wat ik wilde dat **Hug** kon zijn - het is echt inspirerend om iemand dit te zien bouwen._"

							t.Errorf("invalid data type for %v, got %v %#v", dbName, resultType, first[dbName])
						}
					case "Birthday":
						if !strings.Contains(resultType, "Time") && !(DB.Dialector.Name() == "sqlite" && strings.Contains(resultType, "string")) {
							t.Errorf("invalid data type for %v, got %v %#v", dbName, resultType, first[dbName])
						}
					}

					reflectValue := reflect.Indirect(reflect.ValueOf(users[0]))

---

"_Honnêtement, ce que vous avez construit a l'air super solide et élégant. A bien des égards, c'est comme ça que je voulais que **Hug** soit - c'est vraiment inspirant de voir quelqu'un construire ça._"

des systèmes tel qu'Instagram.

Il est relativement fortement couplé aux bases de données relationnelles (comme MySQL ou PostgreSQL), de sorte qu'il
n'est pas très facile d'utiliser une base de données NoSQL (comme Couchbase, MongoDB, Cassandra, etc.) comme principal moyen de
stockage.