使用Java中的mongo存储库查询嵌套字段

Question

我想使用mongorepository获取Id的值。下面的示例显示mondodb文档

{
    "_id" : ObjectId("5baa4779f4a46b0f60a74313"),
    "_class" : "hello.mytest",
    "data" : {
        "type" : [ 
            {
                "testId" : "Id0",
                "usage" : "near",
                "additionalProperties" : {}
            }, 
            {
                "testId" : "Id1",
                "usage" : "far",
                "additionalProperties" : {}
            }]}
            }

当我尝试找到testId获得空值时。

public interface TestRepository extends MongoRepository<mytest, String> {
        List<data> findBytestId(String string);
            }

Answer 1

findBytestId =>“ testId”必须为“ TestId”

public interface TestRepository extends MongoRepository<mytest, String> {
    List<data> findByTestId(String testId);
}

Answer 2

只需在方法中添加注释：

public interface TestRepository extends MongoRepository<mytest, String> {
        @Query("{'data.type.testId': ?0}")
        List<data> findBytestId(String string);
}