}

	// If a file we are watching has a change event, yield and let caller check validity
	select {
	case <-watcher.Events:
		// Something changed, and we must yield
		return nil
	case err := <-watcher.Errors:
		// We had a watch error - that's no good
		return err
	case <-ctx.Done():
		return ctx.Err()
	default:
		// Valid configuration; set isReady to true and wait for modifications before checking again

		}
		return bindDN, nil
	}

	// Since the username parses as a valid DN, check that it exists and is
	// under a configured base DN in the LDAP directory.
	validDN, isUnderBaseDN, err := l.GetValidatedUserDN(conn, username)
	if err == nil && !isUnderBaseDN {
		// Not under any configured base DN, so treat as not found.
		return nil, nil
	}
	return validDN, err
}

```

A string será verificada para se tornar uma URL válida e documentada no esquema JSON/1OpenAPI como tal.

## Atributos como listas de submodelos

Você também pode usar modelos Pydantic como subtipos de `list`, `set`, etc:

```Python hl_lines="20"
{!../../docs_src/body_nested_models/tutorial006.py!}
```

Isso vai esperar(converter, validar, documentar, etc) um corpo JSON tal qual:

```JSON hl_lines="11"

```Python
q: Union[str, None] = Query(default=None, max_length=50)
```

Cela va valider les données, montrer une erreur claire si ces dernières ne sont pas valides, et documenter le paramètre dans le schéma `OpenAPI` de cette *path operation*.

## Rajouter plus de validation

Vous pouvez aussi rajouter un second paramètre `min_length` :

sokkal
számára
szemben
szerint
szinte
talán
tehát
teljes
tovább
továbbá
több
úgy
ugyanis
új
újabb
újra
után
utána
utolsó
vagy
vagyis
valaki
valami
valamint
való
vagyok
van
vannak
volt
voltam
voltak
voltunk
vissza
vele
viszont

02E5..02E9    ; valid                  ;      ; NV8    # 1.1  MODIFIER LETTER EXTRA-HIGH TONE BAR..MODIFIER LETTER EXTRA-LOW TONE BAR
02EA..02EB    ; valid                  ;      ; NV8    # 3.0  MODIFIER LETTER YIN DEPARTING TONE MARK..MODIFIER LETTER YANG DEPARTING TONE MARK
02EC          ; valid                                  # 3.0  MODIFIER LETTER VOICING

func (ct ColumnType) DatabaseTypeName() string {
	if ct.DataTypeValue.Valid {
		return ct.DataTypeValue.String
	}
	return ct.SQLColumnType.DatabaseTypeName()
}

// ColumnType returns the database type of the column. like `varchar(16)`
func (ct ColumnType) ColumnType() (columnType string, ok bool) {
	return ct.ColumnTypeValue.String, ct.ColumnTypeValue.Valid
}

// PrimaryKey returns the column is primary key or not.

			valid: false,
		},
		{
			name:  "port name missing service",
			in:    portNameMissingSvc,
			valid: false,
		},
		{
			name:  "version label missing deployment",
			in:    versionLabelMissingDeployment,
			valid: true,
		},
		{
			name:  "valid port naming service",
			in:    validPortNamingSvc,
			valid: true,
		},
		{
			name:  "valid port naming with suffix service",

					Source:      "source",
					Destination: "destination",
					SecretMeta: SecretMeta{
						Valid:        true,
						SerialNumber: "serial_number",
						NotAfter:     "expires",
						NotBefore:    "valid",
						Type:         "type",
					},
				},
			},
			expected: append(
				[]string{"olinger", "serial_number", "expires", "valid", "type"},
				secretItemColumns...),
			unexpected: []string{"source", "destination", "certdata"},

				strings.Join([]string{
					// generating a valid credential.
					generateCredentialStr(
						"access key",
						sampleTimeStr,
						"us-west-1",
						"s3",
						"aws4_request"),
					// valid SignedHeader.
					"SignedHeaders=host;x-amz-content-sha256;x-amz-date",
					// valid Signature field.
					// a valid signature is of form "Signature="
					"Signature=abcd",
				}, ","),