So am working on Spring Boot project that help teachers group students , schedule sessions…
and i have this two classes user and group the problem is i don’t know if its better to make it bidirectional (like it is now) or to make it unidirectional by removing groups ref inside of the user because i thought that if i am going to find all groups that belongs to user x in his groups list its easier than finding all group that user x is part of from all the groups and same goes the other way.

this is my code right now which am not sure if its the best design i tried using chatgpt and copilot but they didn’t help me much.
User :

@Data
@Document(collection = "users")
@Builder
public class User implements UserDetails {
    @Id
    private String id;
    @NotNull
    @Indexed(unique = true)
    @Email
    private String email;
    @NotNull
    private String password;
    @NotNull
    private String name;
    @NotNull
    private String lastname;
    private String image;
    private List<String> groups;
    private Role role;
    @NotNull
    private Boolean verified;
    @NotNull
    private Boolean ban;
}

Group :

@Data
@Document(collection = "groups")
@Builder
public class Group {
    @Id
    private String id;
    private String name;
    private String teacher;
    private List<String> students;

}