一对多关系，如何在spring boot中保存或更新数据

Question

我正在为我工​​作的公司构建一个 API，这是我第一次使用 Spring Boot，所以我遇到了一些问题。

我有 2 个班级，Compania（家长）和 Office（孩子）。 Compania 类与 Office 具有 OneToMany 关系，Office 具有 ManyToOne，我正在努力寻找如何添加一些孩子或编辑其中一个。现在我的课程如下：

公司（母公司）

@Entity(name = "Compania")
@Table(
    name = "compania"
)
public class Compania {
    @Id
    @SequenceGenerator(
        name = "compania_sequence",
        sequenceName = "compania_sequence",
        allocationSize = 1
    )
    @GeneratedValue(
        strategy = GenerationType.SEQUENCE,
        generator = "compania_sequence"
    )
    @Column(
        nullable = false
    )
    private Long id;


    @Column(
        name = "name",
        nullable = false,
        unique = true
    )
    private String name;

    @Column(
        name = "dominio",
        nullable = true
    )
    private String dominio;

    @Column(
        name = "altas"
    )
    private String altas;

    @Column(
        name = "bajas"
    )
    private String bajas;

    @OneToMany(
        mappedBy = "compania",
        cascade = CascadeType.ALL,
        fetch = FetchType.LAZY,
        orphanRemoval = true
    )
    private List<Office> office;

...Constructors...
... Getters and Setters...

办公室（儿童）

@Entity()
@Table()
public class Office {
    @Id
    @SequenceGenerator(
        name = "office_sequence",
        sequenceName = "office_sequence",
        allocationSize = 1
    )
    @GeneratedValue(
        strategy = GenerationType.SEQUENCE,
        generator = "office_sequence"
    )
    @Column(
        nullable = false
    )
    @JsonIgnore
    private Long id;

    @Column(
        name = "idRef",
        nullable = false
    )
    private int idRef;

    @Column(
        name = "title",
        nullable = false
    )
    private String title;

    @Column(
        name = "name"
    )
    private String name;
    @Column(
        name = "path"
    )
    private String path;

    @ManyToOne(
        fetch = FetchType.LAZY
    )
    @JoinColumn(
        name = "compania_id",
        referencedColumnName = "id"
    )
    private Compania compania;

    ...Constructors...
    ... Getters and Setters...

我想在我的父对象（具有 OneToMany 关系的对象）中保存或编辑数据 为了实现这一点，我想到了两种方法，但两种方法都有问题。

第一个是将所有内容保存在 Compania（父）类中。像这样，我将 Compania 类的 id 和 JSON 对象作为 Office 对象传递：

public void addOfficeTest(Long companiaId, Office office) {
        // OPTION 1 - Add directly the office to the office list of the Compania Object (parent), then save it using Compania repository
        if (office.getId() != null) {
            office.setId(null);
        }
        Compania companiaFound = companiaRepository.findById(companiaId).get();
        List<Office> listaOffice = companiaFound.getOffice();
        listaOffice.add(office);
        companiaFound.setOffice(listaOffice);
        // method to set references id for user use...
        setIdReferencia(companiaEnc, true, false);
        companiaRepository.save(companiaEnc);

使用这种方法，我的问题是我无法保存我的实体，当我进行 GET 以获取我的 Companias 时，我将 Office 作为一个空字符串。像这样：

{
        "id": 1,
        "name": "Test Compania",
        "dominio": "domain",
        "altas": "OU=nn",
        "bajas": "none",
        "office": []
}

我认为的另一种方法是使用 Office 存储库保存 Office，但是当我尝试获取我的 Compania 时返回了 无限递归错误（因为我将 compania 保存在办公室）...

public void addOfficeTest(Long companiaId, Office office) {
        // OPTION 2 - Save Office with the repository office
        if (office.getId() != null) {
            office.setId(null);
        }
        Compania companiaEnc = companiaRepository.findById(companiaId).get();
        office.setCompania(companiaEnc); // This causes recursion
        officeRepository.save(office); 

所以我被困在这里，因为我不知道如何为我的子对象执行 PUT 或 POST。我不知道我的代码是否有问题或什么。也许它有一个简单的解决方案，但我真的找不到。如果有人可以帮助给我一个如何进行 POST 和 PUT 的示例，我将不胜感激......

谢谢

Answer 1

鉴于您具有双向关系，我认为您缺少在新的 Office 中设置 Compania 对象。大致如下：

public void addOfficeTest(Long companiaId, Office office) {
    // OPTION 1 - Add directly the office to the office list of the Compania Object (parent), then save it using Compania repository
    if (office.getId() != null) {
        office.setId(null);
    }
    Compania companiaFound = companiaRepository.findById(companiaId).get();
    office.setCompania(companiaFound); // The new line
    List<Office> listaOffice = companiaFound.getOffice();
    listaOffice.add(office);
    companiaFound.setOffice(listaOffice); // You actually don't need this because you've changed the List already
    // method to set references id for user use...
    setIdReferencia(companiaEnc, true, false);
    companiaRepository.save(companiaEnc);
}