I have one Question entity in my Spring project, which is being sent as a response. Question entity has @ManyToOne relationship with User entity.
Question class
@Entity
public class Question {
@Id
@GeneratedValue(strategy = GenerationType.AUTO)
private int questionId;
@Column
private String question;
@ManyToOne
private User user;
@OneToMany
@JoinColumn(name = "question_id")
private List<Answer> answerList;
public User getUser() {
return user;
}
public void setUser(User user) {
this.user = user;
}
public List<Answer> getAnswerList() {
return answerList;
}
public void setAnswerList(List<Answer> answerList) {
this.answerList = answerList;
}
public int getQuestionId() {
return questionId;
}
public void setQuestionId(int questionId) {
this.questionId = questionId;
}
public String getQuestion() {
return question;
}
public void setQuestion(String question) {
this.question = question;
}
}
User class
@Entity
public class User {
@Id
@GeneratedValue(strategy = GenerationType.AUTO)
private int userId;
private String userName;
public String getUserName() {
return userName;
}
public void setUserName(String userName) {
this.userName = userName;
}
public int getUserId() {
return userId;
}
public void setUserId(int userId) {
this.userId = userId;
}
}
I am sending a response in a JSON format. Below is the example of my response for a single question.
{
"questionId": 1,
"question": "What is java?",
"user": {
"userId": 1,
"userName": "JeffHardy"
},
"answerList": [],
}
Just notice the user object in JSON. Whole user object is being sent as a response. I just want to return userId instead of user object. How can I achieve it?
You can ignore the fields with @JsonIgnoreProperties(value = { "fieldName" })
annotation on class level. for example:
@Entity
@JsonIgnoreProperties(value = { "userName" })
public class User {
@Id
@GeneratedValue(strategy = GenerationType.AUTO)
private int userId;
private String userName;
public String getUserName() {
return userName;
}
public void setUserName(String userName) {
this.userName = userName;
}
public int getUserId() {
return userId;
}
public void setUserId(int userId) {
this.userId = userId;
}
}
But I suggest to create customized classes for response jsons.
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