## Validation additionnelle

Nous allons imposer que bien que `q` soit un paramètre optionnel, dès qu'il est fourni, **sa longueur n'excède pas 50 caractères**.

## Importer `Query`

Pour cela, importez d'abord `Query` depuis `fastapi` :

```Python hl_lines="3"
{!../../../docs_src/query_params_str_validations/tutorial002.py!}
```

var (
	DefaultCredentials = Credentials{
		AccessKey: DefaultAccessKey,
		SecretKey: DefaultSecretKey,
	}
)

// claim key found in credentials which are service accounts
const iamPolicyClaimNameSA = "sa-policy"

const (
	// AccountOn indicates that credentials are enabled
	AccountOn = "on"
	// AccountOff indicates that credentials are disabled
	AccountOff = "off"
)

		}
	}
}

func TestReadOldGNUSparseMap(t *testing.T) {
	populateSparseMap := func(sa sparseArray, sps []string) []string {
		for i := 0; len(sps) > 0 && i < sa.maxEntries(); i++ {
			copy(sa.entry(i), sps[0])
			sps = sps[1:]
		}
		if len(sps) > 0 {
			copy(sa.isExtended(), "\x80")
		}
		return sps
	}

```Python
{!../../../docs_src/python_types/tutorial011.py!}
```

!!! info
    Pour en savoir plus à propos de <a href="https://docs.pydantic.dev/" class="external-link" target="_blank">Pydantic, allez jeter un coup d'oeil à sa documentation</a>.

**FastAPI** est basé entièrement sur **Pydantic**.

Vous verrez bien plus d'exemples de son utilisation dans [Tutoriel - Guide utilisateur](tutorial/index.md){.internal-link target=_blank}.

					Groups:        acc.Credentials.Groups,
					Claims:        claims,
					SessionPolicy: json.RawMessage(policyJSON),
					Status:        acc.Credentials.Status,
					Name:          sa.Name,
					Description:   sa.Description,
					Expiration:    &sa.Expiration,
				}
			}

			svcAccData, err := json.Marshal(svcAccts)
			if err != nil {
				writeErrorResponse(ctx, w, exportError(ctx, err, iamFile, ""), r.URL)

serviceAccount:
  create: true
  ## The name of the service account to use. If 'create' is 'true', a service account with that name
  ## will be created.
  name: "minio-sa"

metrics:
  serviceMonitor:
    enabled: false
    # scrape each node/pod individually for additional metrics
    includeNode: false
    public: true
    additionalLabels: {}
    annotations: {}

   */
  public static final MediaType FLV_VIDEO = createConstant(VIDEO_TYPE, "x-flv");

  /**
   * The 3GP multimedia container format. For more information, see <a
   * href="ftp://www.3gpp.org/tsg_sa/TSG_SA/TSGS_23/Docs/PDF/SP-040065.pdf#page=10">3GPP TS
   * 26.244</a>.
   *
   * @since 20.0
   */
  public static final MediaType THREE_GPP_VIDEO = createConstant(VIDEO_TYPE, "3gpp");

  /**

		Example: "  istioctl x workload group create --name foo --namespace bar --labels app=foo,bar=baz " +
			"--ports grpc=3550,http=8080 --annotations annotation=foobar --serviceAccount sa",
		Args: func(cmd *cobra.Command, args []string) error {
			if name == "" {
				return fmt.Errorf("expecting a workload name")
			}
			if namespace == "" {
				return fmt.Errorf("expecting a workload namespace")

                          "filter_state": {
                           "key": "io.istio.peer_principal",
                           "string_match": {
                            "exact": "spiffe://cluster.local/ns/default/sa/sleep"
                           }
                          }
                         }
                        ]
                       }
                      },
                      {

	default:
		return globalMinioModeFS
	}
}

func iamPolicyClaimNameOpenID() string {
	return globalIAMSys.OpenIDConfig.GetIAMPolicyClaimName()
}

func iamPolicyClaimNameSA() string {
	return "sa-policy"
}

// On MinIO a directory object is stored as a regular object with "__XLDIR__" suffix.
// For ex. "prefix/" is stored as "prefix__XLDIR__"
func encodeDirObject(object string) string {