Redis @Reference在Spring Data Redis中不起作用

Posted 2021-03-26

我在@Reference实施Spring Boot + Spring Data Redis时遇到问题。 Address是Employee的列表，当我保存office和home地址时，我期待数据与Employee一起保存。但数据没有得到保存，因此无法使用Address搜索street。

employee.Java

@Builder
@Data
@AllArgsConstructor
@NoArgsConstructor
@RedisHash("employees")
public class Employee {
    @Id @Indexed
    private String id;
    private String firstName;
    private String lastName;

    @Reference
    private List<Address> addresses;
} 

address.Java

@Builder
@Data
@AllArgsConstructor
@NoArgsConstructor
@RedisHash("address")
public class Address {
    @Id
    private String id;
    @Indexed
    private String street;
    private String city;
}

考试班

@RunWith(SpringJUnit4ClassRunner.class)
@SpringBootTest
public class EmployeeAdressTest extends RepositoryTestSupport{
    @Autowired private EmployeeRepository employeeRepository;


    @Before
    public void setUp() throws JsonProcessingException {
        Address home = Address.builder().street("ABC Street").city("Pune").build();
        Address offc = Address.builder().street("XYZ Street").city("Pune").build();

        Employee employee1 = Employee.builder().firstName("Raj").lastName("Kumar").addresses(Arrays.asList(home, offc)).build();
        employeeRepository.save(employee1);


        List<Employee> employees = employeeRepository.findByAddresses_Street("XYZ Street");
        System.out.println("EMPLOYEE = "+employees);
    }

    @Test
    public void test() {

    }
}

Spring Doc：

8.8. Persisting References
Marking properties with @Reference allows storing a simple key reference instead of copying values into the hash itself. On loading from Redis, references are resolved automatically and mapped back into the object, as shown in the following example:

Example 30. Sample Property Reference
_class = org.example.Person
id = e2c7dcee-b8cd-4424-883e-736ce564363e
firstname = rand
lastname = al’thor
mother = people:a9d4b3a0-50d3-4538-a2fc-f7fc2581ee56      
Reference stores the whole key (keyspace:id) of the referenced object.

?

答案

Spring Data Redis要求您将存储在home和office中的对象与引用对象employee1分开保存。

这是（现在）在第8.8章末尾的官方文件中说明的：https://docs.spring.io/spring-data-redis/docs/current/reference/html/#redis.repositories.references

因此，如果您在保存home之前将office和employee1保存到数据库中，那么您应该没问题。

对于稍后对引用对象所做的更新，相同的btw保持有效。仅保存引用对象不会保存引用对象的更新。