Question

考虑到下面的简化模型，我想写一条规则MyCollection contains MyField，但是我得到的只是数据源项列表，以供选择，就好像集合的ValueInputType仅适用于User。我应该在模型中进行哪些更改以实现该目标？

public class MyModel
{
    [Field(Settable = false, DataSourceName = "MyDataSource")]
    public int MyField { get; set; }

    [Field(Settable = false, ValueInputType = ValueInputType.All, DataSourceName = "MyDataSource"))]
    public List<int> MyCollection { get; set; }
}

Answer 1

根据文档here，数字值类型的集合只能使用ValueInputType.User（在本文中间查找“ IMPORTANT！”标题之一）。因此，您不能在规则条件中使用MyField字段的值。您需要创建一个规则方法来实现该目标：

@Singleton
public class SomeService {
    private final FirstRestApi firstRestApi;
    private final SecondRestApi secondRestApi;

    public SomeService(FirstRestApi firstRestApi, SecondRestApi secondRestApi) {
        this.firstRestApi = firstRestApi;
        this.secondRestApi = secondRestApi;
    }

    public Single<AggregatedResponse> login(String data) {
        Single<FirstResponse> firstResponse = firstRestApi.call(data);
        Single<SecondResponse> secondResponse = secondRestApi.call();
        return firstResponse.zipWith(secondResponse, this::convertResponse);
    }

    private AggregatedResponse convertResponse(FirstResponse firstResponse, SecondResponse secondResponse) {
        return AggregatedResponse
                   .builder()
                   .something1(firstResponse.getSomething1())
                   .something2(secondResponse.getSomething2())
                   .build();
    }
}

具有这种规则的方法，您的规则应如下所示：

public bool Contains(List<int> collection, [Parameter(DataSourceName = "MyDataSource")] int i)
{
    return collection.Contains(i);
}

是否可以检查集合是否包含字段值？

1 个答案: