Spring Boot中没有外键的REST API返回项

Question

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I created rest api with Spring-boot that return all data from database(MySql). In sql many to one relationship Category-Item

In controller i want to get all item with foreign key

Entities

@Entity
@Table(name = "categories")
public class Category implements Serializable {
    @Id
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    private int id;
    private String category_name;


    @OneToMany(cascade = CascadeType.ALL)
    private Set<Maqal> maqals;

    public Category() {

    }

    public Category(String category_name) {
        this.category_name = category_name;
    }
}

@Entity
@Table(name = "maqals")
public class Maqal implements Serializable {
    @Id
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    private int id;
    private String context;

    @ManyToOne(optional = false)
    @JoinColumn(name = "category_id", unique = true)
    private Category category;


    public Maqal() {
    }

    public Maqal(String context) {
        this.context = context;
    }
}

Controller

    @RequestMapping("/allData")
    public Iterable<Maqal> getAllData() {
        return maqalsDao.findAll();
    }

But /allData return without foreign key. How can I add proterties or values for foreign key in Maqals.class?

Answer 1

假设您使用的是Spring Data，并且您的数据库与您的实体保持一致，请为两个实体类中的所有ID字段添加getter和setter以便显示和设置ID。

Answer 2

You cannot show the data which one using foreign key. Suppose you need to show the values means to manually the data using the foreign key.

Otherwise: You need to remove the @JoinColumn annotation.