java - 使用模型映射器将实体转换为 DTO 正在下降

Question

当实体与另一个实体具有 OneToMany 关系时，如何使用 ModelMapper 将实体转换为 DTO。

我有一个实体学生

    @Getter
    @Setter
    public class Student{
        private int name;
        private Set<Department> department;
        }

    @Getter
    @Setter
    public class Department{
        private int name;
        }

    @Getter
    @Setter
    public class StudentDto{
     private int name;
            private Set<DepartmentDto> departmentDto;
    }

  @Getter
    @Setter
    public class DepartmentDto{
     private int name;
           private int name;
    }

我正在使用以下方法将实体转换为 DTO:-

private List<StudentDto> convertToDto(List<Student> Student) {
        List<StudentDto> studentDtos= new LinkedList<>();
        Iterator<Student> student= student.iterator();
        while (student.hasNext()) {
            Student student2= student.next();
            studentDtos.add(modelMapper.map(student2, StudentDTo.class));
        }
        return studentDtos;
    }

当我这样做时，我在 Controller 中调用它，在那里我可以看到 Department DTo 为空。你能告诉我我哪里做错了吗？

Answer 1

只需将 StudentDto 更改为:

@Getter
@Setter
public class StudentDto{
     private int name;
     private Set<DepartmentDto> department;
}

或者更好的命名可能是:

@Getter
@Setter
public class Student {
    private int name;
    private Set<Department> departments;
}

@Getter
@Setter
public class StudentDto {
    private int name;
    private Set<DepartmentDto> departments;
}