我只希望管理员在表学生注册记录中插入“课程”（ABM）和“教育程度”（11年级）和“科目”（编年史），它将在subjectsectionteacher（第二张图片）中获取所有相关数据，并将自动保存对于学生报名的科目（第三张图片），我的问题只是保存了一个数据。

student enrollment record

subjectsectionteacher

这就是我想要的结果

Result I want

这是我得到的结果

what I got result

class StudentsEnrolledSubject(models.Model):
    Students_Enrollment_Records = models.ForeignKey(StudentsEnrollmentRecord,related_name='+',on_delete=models.CASCADE,null=True)
    Subject_Section_Teacher = models.ForeignKey(SubjectSectionTeacher,null=True)

@receiver(post_save,sender=StudentsEnrollmentRecord)
def create(sender,instance,created,**kwargs):
    teachers = SubjectSectionTeacher.objects.all().filter(Sections=instance.Section,Education_Levels=instance.Education_Levels)
    if created and teachers.exists():
            StudentsEnrolledSubject.objects.update_or_create(
            pk=instance.pk,# This should be the instance not instance.Student_Users
            Students_Enrollment_Records=instance,# The below is also not an instance of SubjectSectionTeacher
            Subject_Section_Teacher=teachers.first()

        )



class StudentsEnrollmentRecord(models.Model):
    Student_Users = models.ForeignKey(StudentProfile,related_name='students',null=True)
    School_Year = models.ForeignKey(SchoolYear,null=True,blank=True)
    Courses = models.ForeignKey(Course,blank=True)
    Section = models.ForeignKey(Section,blank=True)
    Payment_Type = models.ForeignKey(PaymentType,null=True)
    Education_Levels = models.ForeignKey(EducationLevel,blank=True,null=True)
class SubjectSectionTeacher(models.Model):
    School_Year = models.ForeignKey(SchoolYear,blank=True)
    Sections = models.ForeignKey(Section,null=True)
    Subjects = models.ForeignKey(Subject,null=True)