@JsonIgnoreProperties

mariadb 에

SELECT * FROM image WHERE userId IN (SELECT toUserId FROM subscribe WHERE fromUSerId = 2);

쿼리를 작성하면,

2번이 구독하는 1,3 번의 image로부터 정보를 얻어낸다.

 

Image.java는 아래와 같다.

import java.time.LocalDateTime;

import javax.persistence.Entity;
import javax.persistence.FetchType;
import javax.persistence.GeneratedValue;
import javax.persistence.GenerationType;
import javax.persistence.Id;
import javax.persistence.JoinColumn;
import javax.persistence.ManyToOne;
import javax.persistence.PrePersist;

import com.fasterxml.jackson.annotation.JsonIgnoreProperties;

import lombok.AllArgsConstructor;
import lombok.Builder;
import lombok.Data;
import lombok.NoArgsConstructor;

@Builder
@AllArgsConstructor
@NoArgsConstructor
@Data
@Entity
public class Image {

	
	@Id
	@GeneratedValue(strategy = GenerationType.IDENTITY)
	private int id;
	private String caption;
	private String postImageUrl; 
	

	@JoinColumn(name = "userId")
	@ManyToOne(fetch = FetchType.EAGER) 
	private User user;
		
	private LocalDateTime createDate;
	
	@PrePersist
	public void createDate() {
		this.createDate = LocalDateTime.now();
	}

}

 

따라서 id, caption, postImageUrl, user 등의 정보를 얻을 수 있다.

 

그런데, 여기에 private User user;이 있어서,

User.java를 보니, 다음과 같다. 

import java.time.LocalDateTime;
import java.util.List;

import javax.persistence.Column;
import javax.persistence.Entity;
import javax.persistence.FetchType;
import javax.persistence.GeneratedValue;
import javax.persistence.GenerationType;
import javax.persistence.Id;
import javax.persistence.OneToMany;
import javax.persistence.PrePersist;

import com.fasterxml.jackson.annotation.JsonIgnoreProperties;

import lombok.AllArgsConstructor;
import lombok.Builder;
import lombok.Data;
import lombok.NoArgsConstructor;

@Builder
@AllArgsConstructor
@NoArgsConstructor
@Data
@Entity
public class User {

	
	@Id
	@GeneratedValue(strategy = GenerationType.IDENTITY)
	private int id;
	
	@Column(length =100, unique = true)
	private String username;
	@Column(nullable =false)
	private String password;
	@Column(nullable=false)
	private String name;
	
	private String website;
	private String bio;
	@Column(nullable =false)
	private String email;
	private String phone;
	private String gender;
	
	private String profileImageUrl;
	private String role;
	
	@OneToMany(mappedBy = "user", fetch = FetchType.LAZY)
	@JsonIgnoreProperties({"user"})
	private List<Image> images; 
	
	
	private LocalDateTime createDate;
	
	@PrePersist 
	public void createDate() {
		this.createDate = LocalDateTime.now();
	}
	
}

 

여기에, private List<Image> images;가 있다.

그런데 mariadb 쿼리에서 

SELECT * FROM image WHERE userId IN (SELECT toUserId FROM subscribe WHERE fromUSerId = 2);

이렇게 이미 image로부터 정보를 불러오는 것이기 때문에,

User.java에서 또 image 정보들을 불러올 필요가 없다.

 

그래서 이를 무시하도록, Image.java에서 

 

@JsonIgnoreProperties({"images"})

private User user; 

 

이렇게 해주면 된다.

 

import java.time.LocalDateTime;

import javax.persistence.Entity;
import javax.persistence.FetchType;
import javax.persistence.GeneratedValue;
import javax.persistence.GenerationType;
import javax.persistence.Id;
import javax.persistence.JoinColumn;
import javax.persistence.ManyToOne;
import javax.persistence.PrePersist;

import com.fasterxml.jackson.annotation.JsonIgnoreProperties;

import lombok.AllArgsConstructor;
import lombok.Builder;
import lombok.Data;
import lombok.NoArgsConstructor;

@Builder
@AllArgsConstructor
@NoArgsConstructor
@Data
@Entity
public class Image {

	
	@Id
	@GeneratedValue(strategy = GenerationType.IDENTITY)
	private int id;
	private String caption;
	private String postImageUrl; 
	
    
  // 이 부분 추가  
	@JsonIgnoreProperties({"images"})
	@JoinColumn(name = "userId")
	@ManyToOne(fetch = FetchType.EAGER) 
	private User user;
		
	private LocalDateTime createDate;
	
	@PrePersist
	public void createDate() {
		this.createDate = LocalDateTime.now();
	}

}