java - 列表中包含 "id"的默认 Spring Data 查询(JpaRepository)

Question

我有如下简单实体:

建议.java:

@Entity
public class Suggestion {

    @Id
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    private long id;

    @OneToOne
    private Employee author;

    @OneToMany
    @JoinColumn(name = "recipients_id")
    private List<Employee> recipients;
}

和 Employee.java:

@Entity
public class Employee {

    @Id
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    private long id;

    private String name;
}

我想在 Controller 中返回所有 suggestions其中包含仅一个员工的 id在recipients列表。

是否可以避免自定义查询(原生查询)？

我尝试过:

findByRecipientsContains(id) 或

findByRecipientsContaining(id)

但运气不佳...

<小时/>

编辑:

当我在存储库中使用时:

Optional<List<Suggestion>> findByRecipientsIn(Long id);

也没有 Optional并在 Controller 中:

    @GetMapping("/employees/{id}/suggestions")
    @ResponseStatus(HttpStatus.OK)
    public List<Suggestion> getSuggestionsByRecipient(@PathVariable("id") Long id) {
        return suggestionRepository.findByRecipientsIn(id).get();
    }

我得到的异常如下:

Parameter value element [1] did not match expected type [com.herokuapp.erpmesbackend.erpmesbackend.employees.Employee (n/a)]; nested exception is java.lang.IllegalArgumentException: Parameter value element [1] did not match expected type [com.herokuapp.erpmesbackend.erpmesbackend.employees.Employee (n/a)]] with root cause

Answer 1

这应该简单地工作

findByRecipientsId(Long id)

与此测试用例比较:https://github.com/spring-projects/spring-data-jpa/blob/688becd2b7129b853cd0deaf6bde3b50d9d8ce50/src/test/java/org/springframework/data/jpa/repository/UserRepositoryTests.java#L604