是否可以公开使用连接实体（包含额外数据列）的多对多关系，下面是我的实体；
我正在尝试在 REST 中显示“购买”，我已将“产品”作为工作 REST 映射的示例；
@Entity
public class User {
@Id
@GeneratedValue(strategy = GenerationType.IDENTITY)
private Long id;
@OneToMany(fetch = FetchType.LAZY, cascade = CascadeType.ALL, targetEntity = Purchase.class, orphanRemoval = true)
@JoinColumn(name = "user_id", updatable = false)
private List<Purchase> purchases = new ArrayList<>();
@ManyToMany
@JoinColumn(name = "user_id", updatable = false)
private List<Product> products = new ArrayList<>();
}
@Entity
public class Product {
@Id
@GeneratedValue(strategy = GenerationType.AUTO)
private Long id;
private String name;
}
@Entity
public class Purchase implements Serializable {
@Id
@GeneratedValue(strategy = GenerationType.IDENTITY)
Long id;
@ManyToOne
@JoinColumn(name = "user_id", referencedColumnName = "id")
private User user;
@ManyToOne(targetEntity = Prodect.class)
@JoinColumn(name = "product_id", referencedColumnName = "id")
private Product product;
@Column(name = "purchase_date")
private Date purchaseDate;
}
因此，如果我发送 REST 调用；
[获取 http://localhost:8080/webapp/users/1]
它返回 [http://localhost:8080/webapp/users/1/products] 的链接，但不返回 [http://localhost:8080/webapp/users/1/purchases] 的链接