010. Relationships - dkkahm/study-spring-jpa GitHub Wiki

    @OneToOne
    private Passport passport;

    @OneToOne(mappedBy = "passport")
    private Student student;

    @ManyToOne
    private Course course;

    @OneToMany(mappedBy = "course")
    private List<Review> reviews = new ArrayList<>();

@Entity
public class Student {
    ....

    @ManyToMany
    @JoinTable(name="STUDENT_COURSE",
            joinColumns = @JoinColumn(name="STUDENT_ID"),
            inverseJoinColumns = @JoinColumn(name="COURSE_ID")
    )
    private List<Course> courses = new ArrayList<>();

@Entity
public class Course {
    ....

    @ManyToMany(mappedBy = "courses")
    private List<Student> students = new ArrayList<>();
    ....    

    public void addReview(Long id, String rating, String description) {
        Course course = courseRepository.findById(id);

        Review review = new Review(rating, description);
        review.setCourse(course);

        reivewRepository.save(review);
   }