$this: VALUE_PARAMETER name:<this> type:kotlin.Any
      FUN FAKE_OVERRIDE name:setContentView visibility:public modality:OPEN <> ($this:p2.Parent, p0:kotlin.Int) returnType:kotlin.Unit [fake_override]
        overridden:
          public open fun setContentView (p0: kotlin.Int): kotlin.Unit declared in p2.Parent
        $this: VALUE_PARAMETER name:<this> type:p2.Parent

                Objects.equal(parent, that.parent);
    }

    @Override
    public int hashCode() {
        return Objects.hashCode(self, parent);
    }

    @Override
    public String toString() {
        return "HierarchicalClassLoaderStructure{" +
                "self=" + self +
                ", parent=" + parent +
                '}';
    }

    ```

## 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

    private static final String LANG_KEY = "lang";
    private final Map<String, Object> parent;

    public DocMap(final Map<String, Object> parent) {
        this.parent = parent;
    }

    @Override
    public int size() {
        return parent.size();
    }

    @Override
    public boolean isEmpty() {
        return parent.isEmpty();
    }

    @Override
    public boolean containsKey(final Object key) {

        builder = Model.newBuilder(model);
        modelMerger.mergeModel_ModelVersion(builder, model, parent, false, null);
        assertEquals("5.0.0", builder.build().getModelVersion());
    }

    // ArtifactId is neither inherited nor injected
    @Test
    void testMergeModel_ArtifactId() {
        Model parent = Model.newBuilder().artifactId("PARENT").build();
        Model model = Model.newInstance();

import org.apache.maven.api.model.Parent;

/**
 * Resolves a POM from its coordinates.
 */
public interface ModelResolver extends Service {

    /**
     * Tries to resolve the POM for the specified parent coordinates possibly updating {@code parent}.
     *
     * @param session The session to use to resolve the model, must not be {@code null}.
     * @param parent The parent coordinates to resolve, must not be {@code null}.

        private final ExternalResourceName parent;

        public ListOperation(ExternalResourceName parent) {
            this.parent = parent;
        }

        @Override
        public List<String> call(BuildOperationContext context) {
            try {
                return delegate.list(parent);
            } finally {
                context.setResult(LIST_RESULT);
            }

                }
                int parent = idx - 1;
                while (parent >= 0 && result.charAt(parent) == '/') {
                    parent--;
                }
                parent = result.lastIndexOf('/', parent);
                if (parent < 0) {
                    result = result.substring(idx + 4);
                } else {
                    result = result.substring(0, parent) + result.substring(idx + 3);

    "foo",
    "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：

        this.name = name;
        return this;
    }

    /**
     * Specifies the parent project. Use it to create multi-module projects.
     *
     * @param parent parent project
     * @return The builder
     */
    public ProjectBuilder withParent(@Nullable Project parent) {
        this.parent = parent;
        return this;
    }

    /**
     * Creates the project.
     *