"name": {
											Type: "string",
											XValidations: apiextensions.ValidationRules{
												{
													Rule: "self == 'singleton'",
												},
											},
											Default: jsonPtr("singleton"),
										},
									},
								},
							},
						},
						"value": {
							Type: "string",
							XValidations: apiextensions.ValidationRules{
								{

	return s.messageExpression
}

func (s *Structural) XValidations() []common.ValidationRule {
	if len(s.Structural.XValidations) == 0 {
		return nil
	}
	result := make([]common.ValidationRule, len(s.Structural.XValidations))
	for i, v := range s.Structural.XValidations {

	}
}

func (x *ValidationExtensions) toKubeOpenAPI(ret *spec.Schema) {
	if x == nil {
		return
	}

	if len(x.XValidations) > 0 {
		ret.VendorExtensible.AddExtension("x-kubernetes-validations", x.XValidations)
	}
}

func (v *ValueValidation) toKubeOpenAPI(ret *spec.Schema) {
	if v == nil {
		return
	}

	ret.Format = v.Format
	ret.Maximum = v.Maximum

func (in *ValidationExtensions) DeepCopyInto(out *ValidationExtensions) {
	*out = *in
	if in.XValidations != nil {
		in, out := &in.XValidations, &out.XValidations
		*out = make(v1.ValidationRules, len(*in))
		for i := range *in {
			(*in)[i].DeepCopyInto(&(*out)[i])
		}
	}
	return
}

	if s == nil {
		return nil, nil
	}

	ret := &ValidationExtensions{}
	if err := apiextensionsv1.Convert_apiextensions_ValidationRules_To_v1_ValidationRules(&s.XValidations, &ret.XValidations, nil); err != nil {
		return nil, err
	}

	return ret, nil
}

// validateUnsupportedFields checks that those fields rejected by validation are actually unset.

// used for validation rather than structure.
type ValidationExtensions struct {
	// x-kubernetes-validations describes a list of validation rules for expression validation.
	// Use the v1 struct since this gets serialized as an extension.
	XValidations apiextensionsv1.ValidationRules
}

// +k8s:deepcopy-gen=true

    ```

## Recap

With `Query`, `Path` (and others you haven't seen yet) you can declare metadata and string validations in the same ways as with [Query Parameters and String Validations](query-params-str-validations.md){.internal-link target=_blank}.

And you can also declare numeric validations:

* `gt`: `g`reater `t`han
* `ge`: `g`reater than or `e`qual
* `lt`: `l`ess `t`han
* `le`: `l`ess than or `e`qual

    "bar"
  ]
}
```

!!! tip
    要声明类型为 `list` 的查询参数，如上例所示，你需要显式地使用 `Query`，否则该参数将被解释为请求体。

交互式 API 文档将会相应地进行更新，以允许使用多个值：

<img src="https://fastapi.tiangolo.com/img/tutorial/query-params-str-validations/image02.png">

### 具有默认值的查询参数列表 / 多个值

你还可以定义在没有任何给定值时的默认 `list` 值：

```Python hl_lines="9"
{!../../../docs_src/query_params_str_validations/tutorial012.py!}
```

如果你访问：

```

    validations:
      required: true
  - type: textarea
    id: actual-behavior
    attributes:
      label: "What did you see happen?"
    validations:
      required: true
  - type: textarea
    id: expected-behavior
    attributes:
      label: "What did you expect to see?"
    validations:
      required: true
  - type: textarea

    id: current-behavior
    attributes:
      label: Current Behavior
      description: Tell us what happens
    validations:
      required: true
  - type: textarea
    id: expected-behavior
    attributes:
      label: Expected Behavior
      description: Tell us what should happen
    validations:
      required: true
  - type: textarea
    id: context
    attributes:
      label: Context (optional)