[4단계] 도메인 연관관계 매핑 (JPA)

ToString 사용시 순한 참조 조심해야 합니다.

 

package com.puzzlix.solid_task.domain.comment;

import com.puzzlix.solid_task.domain.issue.Issue;
import com.puzzlix.solid_task.domain.user.User;
import jakarta.persistence.*;
import lombok.*;

@Getter
@Setter
@NoArgsConstructor
@AllArgsConstructor
@Entity
@ToString(exclude = {"issue", "writer"}) // 순한 참조 방지(양방향 매핑시 조심해야 될 부분)
public class Comment {
    @Id
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    private Long id;
    private String content;

    // 어디 이슈에 댓글이 달렸는가
    @ManyToOne(fetch = FetchType.LAZY)
    @JoinColumn(name = "issue_id")
    private Issue issue;

    // 누가작성했는가?
    // 이걸전략, 레이지 전략
    @ManyToOne(fetch = FetchType.LAZY)
    @JoinColumn(name = "writer_id")
    private User writer;
}

 

package com.puzzlix.solid_task.domain.user;

import com.puzzlix.solid_task.domain.issue.Issue;
import jakarta.persistence.*;
import lombok.*;

import java.util.ArrayList;
import java.util.List;

@Getter
@Setter
@NoArgsConstructor
@AllArgsConstructor
@Entity
@Table(name = "user_table")
@ToString(exclude = "issues")
public class User {
    @Id
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    private Long id;
    private String name;
    private String email;
    private String password;

    @OneToMany(mappedBy = "reporter")
    private List<Issue> issues = new ArrayList<>();

}

 

package com.puzzlix.solid_task.domain.project;

import com.puzzlix.solid_task.domain.issue.Issue;
import jakarta.persistence.*;
import lombok.*;

import java.util.ArrayList;
import java.util.List;

@Getter
@Setter
@NoArgsConstructor
@AllArgsConstructor
@Entity
@ToString(exclude = {"issues"})
public class Project {
    @Id
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    private Long id;
    private String name;
    private String description;

    // 나는 fk 주인이 아니야
    @OneToMany(mappedBy = "project")
    private List<Issue> issues = new ArrayList<>();

}

 

 

package com.puzzlix.solid_task.domain.issue;

import com.puzzlix.solid_task.domain.comment.Comment;
import com.puzzlix.solid_task.domain.project.Project;
import com.puzzlix.solid_task.domain.user.User;
import jakarta.persistence.*;
import lombok.*;

import java.util.ArrayList;
import java.util.List;

@Getter
@Setter
@NoArgsConstructor
@AllArgsConstructor
@Entity
@ToString(exclude = {"project", "reporter", "assignee", "commnets"})
public class Issue {
    @Id
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    private Long id;
    private String tittle;
    private String description;
    @Enumerated(EnumType.STRING)
    private IssueStatus issueStatus;

    // 추후 연관관계 필드
    @ManyToOne(fetch = FetchType.LAZY)
    @JoinColumn(name = "project_id")
    private Project project;

    // 누가 요청(보고)
    @ManyToOne(fetch = FetchType.LAZY)
    @JoinColumn(name = "reporter_id")
    private User reporter;

    // 담당자(누군가에게 할당 되어 처리 됩니다)
    @ManyToOne(fetch = FetchType.LAZY)
    @JoinColumn(name = "assignee_id")
    private User assignee;

    // 댓글
    // 이슈 너는 댓글에 외래키 주인이 아니야!
    @OneToMany(mappedBy = "issue", cascade = CascadeType.ALL)
    private List<Comment> commnets = new ArrayList<>();

}

 

package com.puzzlix.solid_task.domain.comment;

import org.springframework.data.jpa.repository.JpaRepository;

public interface CommentRepository extends JpaRepository<Comment, Long> {
    // 수십개의 메서드 쿼리를 지원한다.
}

 

package com.puzzlix.solid_task.domain.project;

import org.springframework.data.jpa.repository.JpaRepository;

public interface ProjectRepository extends JpaRepository<Project, Long> {
}

 

package com.puzzlix.solid_task.domain.user;

import org.springframework.data.jpa.repository.JpaRepository;

public interface UserRepository extends JpaRepository<User, Long> {
}

 

 

package com.puzzlix.solid_task.domain.issue;

import com.puzzlix.solid_task.domain.issue.dto.IssueRequest;
import com.puzzlix.solid_task.domain.project.Project;
import com.puzzlix.solid_task.domain.project.ProjectRepository;
import com.puzzlix.solid_task.domain.user.User;
import com.puzzlix.solid_task.domain.user.UserRepository;
import lombok.RequiredArgsConstructor;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;

import java.util.List;
import java.util.NoSuchElementException;

@Service // IoC
@RequiredArgsConstructor
@Transactional
public class IssueService {

    // 구체 클래스가 아닌, IssueRepository 라는 역할(인터페이스)에만 의존한다.
    private final IssueRepository issueRepository;
    private final UserRepository userRepository;
    private final ProjectRepository projectRepository;

    // 이슈 생성 로직
    public Issue createIssue(IssueRequest.Create request) {
        
        // 보고자 ID -> 실제 회원이 있는가? 
        User reporter = userRepository.findById(request.getReporterId())
                .orElseThrow(() -> new NoSuchElementException("해당 ID의 사용자를 찾을 수 없습니다"));
        // 프로젝 ID 검증
        Project project = projectRepository.findById(request.getProjectId())
                .orElseThrow(() -> new NoSuchElementException("해당 ID의 프로젝트를 찾을 수 없습니다"));

        Issue newIssue = new Issue();
        newIssue.setTittle(request.getTitle());
        newIssue.setDescription(request.getDescription());
        newIssue.setReporter(reporter);
        newIssue.setProject(project);
        newIssue.setIssueStatus(IssueStatus.TODO); // 시스템에서 설정 (최초 등록)
        return issueRepository.save(newIssue);
    }

    // 모든 이슈 조회
    @Transactional(readOnly = true)
    public List<Issue> findIssues() {
        return issueRepository.findAll();
    }

}