/// note

FastAPI will know that the value of `q` is not required because of the default value `= None`.

Having `str | None` will allow your editor to give you better support and detect errors.

///

## Additional validation { #additional-validation }

We are going to enforce that even though `q` is optional, whenever it is provided, **its length doesn't exceed 50 characters**.

  echo '==TFCI==: The $TFCI variable is not set. This is fine as long as you'
  echo 'already sourced a TFCI env file with "set -a; source <path>; set +a".'
  echo 'If you have not, you will see a lot of undefined variable errors.'
else
  FROM_ENV=$(mktemp)
  # "export -p" prints a list of environment values in a safe-to-source format,
  # e.g. `declare -x TFCI_BAZEL_COMMON_ARGS="list of args"` for bash.
  export -p | grep TFCI > "$FROM_ENV"

 * Clients call [get] to read a snapshot of an entry. The read will observe the value at the time
 * that [get] was called. Updates and removals after the call do not impact ongoing reads.
 *
 * This class is tolerant of some I/O errors. If files are missing from the filesystem, the
 * corresponding entries will be dropped from the cache. If an error occurs while writing a cache
 * value, the edit will fail silently. Callers should handle other problems by catching

하지만 필요한 경우 사용할 수 있습니다. 🤓

///

{* ../../docs_src/dependencies/tutorial008b_an_py39.py hl[18:22,31] *}

예외를 처리하고(또는 추가로 다른 `HTTPException`을 발생시키기 위해) 사용할 수 있는 또 다른 방법은 [사용자 정의 예외 처리기](../handling-errors.md#install-custom-exception-handlers){.internal-link target=_blank}를 생성하는 것 입니다.

## `yield`와 `except`를 사용하는 의존성

/// tip | Dica

Para resolver esse mesmo problema, é provavelmente muito mais fácil usar o `body` em um manipulador personalizado para `RequestValidationError` ([Tratando Erros](../tutorial/handling-errors.md#use-the-requestvalidationerror-body){.internal-link target=_blank}).

Mas esse exemplo ainda é valido e mostra como interagir com os componentes internos.

///

                    return 0;
                }
            };
            ComponentUtil.register(mockThumbnailManager, "thumbnailManager");

        } catch (Exception e) {
            // Ignore setup errors in test environment
        }
    }

    private void setupMockComponentsWithCounter(final AtomicInteger counter) {
        setupMockComponents();

        // Override thumbnail manager with counter

/// tip | Tipp

Um dasselbe Problem zu lösen, ist es wahrscheinlich viel einfacher, den `body` in einem benutzerdefinierten Handler für `RequestValidationError` zu verwenden ([Fehlerbehandlung](../tutorial/handling-errors.md#den-requestvalidationerror-body-verwenden){.internal-link target=_blank}).

Dieses Beispiel ist jedoch immer noch gültig und zeigt, wie mit den internen Komponenten interagiert wird.

///

✋️ ↩️ 👆 🔀 `GzipRequest.body`, 📨 💪 🔜 🔁 🗜 🕐❔ ⚫️ 📐 **FastAPI** 🕐❔ 💪.

## 🔐 📨 💪 ⚠ 🐕‍🦺

/// tip

❎ 👉 🎏 ⚠, ⚫️ 🎲 📚 ⏩ ⚙️ `body` 🛃 🐕‍🦺 `RequestValidationError` ([🚚 ❌](../tutorial/handling-errors.md#requestvalidationerror){.internal-link target=_blank}).

✋️ 👉 🖼 ☑ & ⚫️ 🎦 ❔ 🔗 ⏮️ 🔗 🦲.

///

👥 💪 ⚙️ 👉 🎏 🎯 🔐 📨 💪 ⚠ 🐕‍🦺.

🌐 👥 💪 🍵 📨 🔘 `try`/`except` 🍫:

			api,
		)
	}

	for api, value := range httpStats.TotalS3Errors.APIStats {
		ch <- prometheus.MustNewConstMetric(
			prometheus.NewDesc(
				prometheus.BuildFQName(s3Namespace, "errors", "total"),
				"Total number of s3 errors in current MinIO server instance",
				[]string{"api"}, nil),
			prometheus.CounterValue,
			float64(value),
			api,
		)
	}

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

func TestMany2ManyAssociation(t *testing.T) {
	user := *GetUser("many2many", Config{Languages: 2})

	if err := DB.Create(&user).Error; err != nil {
		t.Fatalf("errors happened when create: %v", err)
	}

	CheckUser(t, user, user)

	// Find
	var user2 User
	DB.Find(&user2, "id = ?", user.ID)
	DB.Model(&user2).Association("Languages").Find(&user2.Languages)