如何隐藏 "children": [] from last child in one to many relationship in spring boot

Question

实际上我想为我的 React Native 应用程序使用树 Json 响应。所以我在 spring 启动时构建它。但是由于 "children": [] in last child 我在 React Native 中遇到了一些问题。所以我想在我的回复中隐藏它。

1.I 收到了此类回复

[{
            "id": 1,
            "name": "Martin",                
            "haveAccount": false,
            "gender": "m",
            "children": [
                {
                    "id": 4,
                    "name": "Werite",
                    "haveAccount": false,
                    "gender": "f",
                    "children": []
                }
                
            ]
        }]

2.But 我不要 "children": [] 最后 child

示例：-

    [{
                "id": 1,
                "name": "Martin",                
                "haveAccount": false,
                "gender": "m",
                "children": [
                    {
                        "id": 4,
                        "name": "Werite",
                        "haveAccount": false,
                        "gender": "f"
                    }
                    
                ]
            }]

3.Here 是我的实体 class

@Service
@Entity
@Table
public class Family {   
@Id
@GeneratedValue(strategy = GenerationType.IDENTITY )
@Column(name="Family_id")
private Integer id;
private String name;
private String village;
private String wifeName;
private String talukaName;
private Boolean haveAccount;
private String username;
private String gender;
private String mobileNumber;




@OneToOne
@JoinColumn(name = "parent_id")
@JsonBackReference

private Family parent;

@OneToMany(mappedBy = "parent", cascade = CascadeType.ALL)
@JsonManagedReference
private List<Family> children = new ArrayList<>();


public Family(Integer id, String name, String village, String wifeName, String talukaName, Boolean haveAccount,
        String username, String gender, String mobileNumber, Family parent, List<Family> children) {
    super();
    this.id = id;
    this.name = name;
    this.village = village;
    this.wifeName = wifeName;
    this.talukaName = talukaName;
    this.haveAccount = haveAccount;
    this.username = username;
    this.gender = gender;
    this.mobileNumber = mobileNumber;
    this.parent = parent;
    this.children = children;
}
public Family() {
super();
    
}

public Integer getId() {
    return id;
}

public void setId(Integer id) {
    this.id = id;
}

public String getName() {
    return name;
}

public void setName(String name) {
    this.name = name;
}

public Family getParent() {
    return parent;
}

public void setParent(Family parent) {
    this.parent = parent;
}

public List<Family> getChildren() {
    return children;
}

public void setChildren(List<Family> children) {
    this.children = children;
}

public void addChild(Family children) {
    this.children.add(children);
}

public String getVillage() {
    return village;
}

public void setVillage(String village) {
    this.village = village;
}

public String getWifeName() {
    return wifeName;
}

public void setWifeName(String wifeName) {
    this.wifeName = wifeName;
}

public String getTalukaName() {
    return talukaName;
}

public void setTalukaName(String talukaName) {
    this.talukaName = talukaName;
}

public Boolean getHaveAccount() {
    return haveAccount;
}

public void setHaveAccount(Boolean haveAccount) {
    this.haveAccount = haveAccount;
}

public String getUsername() {
    return username;
}

public void setUsername(String username) {
    this.username = username;
}

public String getMobileNumber() {
    return mobileNumber;
}

public void setMobileNumber(String mobileNumber) {
    this.mobileNumber = mobileNumber;
}

public String getGender() {
    return gender;
}

public void setGender(String gender) {
    this.gender = gender;
}

}

Answer 1

如果您想删除一个字段，您可以将其设为空，然后在您的 class 上使用 @JsonInclude(Include.NON_NULL)，如下所示：

@Service
@Entity
@Table
@JsonInclude(Include.NON_NULL)
public class Family {  
  //class
}

如果你能处理好，你应该用 private List<Family> children; 替换 private List<Family> children = new ArrayList<>(); 并在你要使用它时初始化它。

只是一个问题：为什么要在您的实体上使用 @Service class？

如何隐藏 "children": [] from last child in one to many relationship in spring boot

How to hide "children": [] from last child in one to many relationship in spring boot

java

spring

hibernate-onetomany

spring-data-jpa

spring-boot