关联链接的查询方法答案

【问题标题】：Query method on association links关联链接的查询方法
【发布时间】：2018-02-03 08:31:46
【问题描述】：

我有两个实体用户和费用。

费用

@Entity
@Table(name="Expenses")
public class Expense {

    @Id
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    private int id;
    private String name;    
    private BigDecimal amount;
    private Date date;

    @ManyToOne
    @JoinColumn(name="category_id")
    private Category category;  

    @ManyToOne
    @JoinColumn(name="mode_id")
    private Mode mode;

    @ManyToOne
    @JoinColumn(name="user_id")
    private User user;
    // Getter setter and constructor
}

用户

@Entity
@Table(name="Users")
public class User {

    @Id
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    private int id;
    private String username;
    private String password;
    private String email;
    private boolean enabled;
    private String firstName;
    private String lastName;
    private String phoneNumber;
    private String country;

    @OneToMany(mappedBy = "user", fetch = FetchType.EAGER, cascade = CascadeType.REMOVE, orphanRemoval = true)
    private Set<Expense> expense;
    @OneToMany(mappedBy = "user", fetch = FetchType.EAGER, cascade = CascadeType.REMOVE, orphanRemoval = true)
    private Set<Mode> mode;
    @OneToMany(mappedBy = "user", fetch = FetchType.EAGER, cascade = CascadeType.REMOVE, orphanRemoval = true)
    private Set<Category> category;
    // Getter setter and constructor
}

费用存储库

public interface ExpenseRepository extends CrudRepository<Expense, Integer> {
    List<Expense> findByDateBetween(@DateTimeFormat(pattern = "dd-MM-yyyy")@Param("startDate") Date startDate, @DateTimeFormat(pattern = "dd-MM-yyyy") @Param("endDate")Date endDate);
}

用户存储库

public interface UserRepository extends CrudRepository<User, Integer>{
    Optional<User> findByUsername(String username);
}

注意：我使用的是 Spring Data Rest。

我可以通过 http://localhost:8080/api/users/1/expense

访问用户 1 的费用清单

我还可以通过http://localhost:8080/api/expenses/search/findByDateBetween?startDate=01-02-2018&endDate=28-02-2018获取某个日期范围内的费用清单

我想要实现的是通过对用户使用“findByDateBetween”方法来访问费用列表。

此 URL 不起作用并引发 404 错误。

http://localhost:8080/api/users/1/expense/search/findByDateBetween?startDate=01-02-2018&endDate=28-02-2018

{
    "timestamp": 1517645444489,
    "status": 404,
    "error": "Not Found",
    "message": "No message available",
    "path": "/api/users/1/expense/search/findByDateBetween"
}

我做错了什么还是有更好的方法来做到这一点？

【问题讨论】：

日期是费用中的字段，而不是用户中的字段

标签： spring spring-data-rest spring-hateoas

【解决方案1】：

日期是费用中的字段，而不是用户中的字段。像这样创建另一个方法

public interface ExpenseRepository extends CrudRepository<Expense, Integer> {
    List<Expense> findByUser_IdAndDateBetween(Integer id, @DateTimeFormat(pattern = "dd-MM-yyyy")@Param("startDate") Date startDate, @DateTimeFormat(pattern = "dd-MM-yyyy") @Param("endDate")Date endDate);
}

并使用

调用它

http://localhost:8080/api/expenses/search/findByDateBetween?id=1&startDate=01-02-2018&endDate=28-02-2018

【讨论】：