Python 如何从Django中永久删除记录？

型号：- 我有一个员工模型

class Staffs(models.Model):
    id = models.AutoField(primary_key=True)
    admin = models.OneToOneField(CustomUser, on_delete = models.CASCADE)
    address = models.TextField()
    created_at = models.DateTimeField(auto_now_add=True)
    updated_at = models.DateTimeField(auto_now=True)
    objects = models.Manager()

然后我有一个主题模型

class Subjects(models.Model):
    id =models.AutoField(primary_key=True)
    subject_name = models.CharField(max_length=255)
    course_id = models.ForeignKey(Courses, on_delete=models.CASCADE, default=1) #need to give defauult course
    staff_id = models.ForeignKey(CustomUser, on_delete=models.CASCADE)
    #created_at = models.DateTimeField(auto_now_add=True)
    #updated_at = models.DateTimeField(auto_now=True)
    objects = models.Manager()

观点：-

def add_subject(request):
    courses = Courses.objects.all()
    staffs = CustomUser.objects.filter(user_type='2')
    context = {
        "courses": courses,
        "staffs": staffs
    }
    return render(request, 'hod_template/add_subject_template.html', context)



def add_subject_save(request):
    if request.method != "POST":
        messages.error(request, "Method Not Allowed!")
        return redirect('add_subject')
    else:
        subject_name = request.POST.get('subject')

        course_id = request.POST.get('course')
        course = Courses.objects.get(id=course_id)
        
        staff_id = request.POST.get('staff')
        staff = CustomUser.objects.get(id=staff_id)

        try:
            subject = Subjects(subject_name=subject_name, course_id=course, staff_id=staff)
            subject.save()
            messages.success(request, "Subject Added Successfully!")
            return redirect('add_subject')
        except:
            messages.error(request, "Failed to Add Subject!")
            return redirect('add_subject')


def manage_subject(request):
    subjects = Subjects.objects.all()
    context = {
        "subjects": subjects
    }
    return render(request, 'hod_template/manage_subject_template.html', context)


def edit_subject(request, subject_id):
    subject = Subjects.objects.get(id=subject_id)
    courses = Courses.objects.all()
    staffs = CustomUser.objects.filter(user_type='2')
    context = {
        "subject": subject,
        "courses": courses,
        "staffs": staffs,
        "id": subject_id
    }
    return render(request, 'hod_template/edit_subject_template.html', context)


def edit_subject_save(request):
    if request.method != "POST":
        HttpResponse("Invalid Method.")
    else:
        subject_id = request.POST.get('subject_id')
        subject_name = request.POST.get('subject')
        course_id = request.POST.get('course')
        staff_id = request.POST.get('staff')

        try:
            subject = Subjects.objects.get(id=subject_id)
            subject.subject_name = subject_name

            course = Courses.objects.get(id=course_id)
            subject.course_id = course

            staff = CustomUser.objects.get(id=staff_id)
            subject.staff_id = staff
            
            subject.save()

            messages.success(request, "Subject Updated Successfully.")
            # return redirect('/edit_subject/'+subject_id)
            return HttpResponseRedirect(reverse("edit_subject", kwargs={"subject_id":subject_id}))

        except:
            messages.error(request, "Failed to Update Subject.")
            return HttpResponseRedirect(reverse("edit_subject", kwargs={"subject_id":subject_id}))
            # return redirect('/edit_subject/'+subject_id)



def delete_subject(request, subject_id):
    subject = Subjects.objects.get(id=subject_id)
    try:
        subject.delete()
        messages.success(request, "Subject Deleted Successfully.")
        return redirect('manage_subject')
    except:
        messages.error(request, "Failed to Delete Subject.")
        return redirect('manage_subject')

现在，当我想添加一个主题时，它是这样进行的

主题名称：- 蟒蛇

（让我从我参加的课程列表中选择，如MCA、BCA等） 课程：- 工商管理硕士

（让我从输入的员工名单中选择，如Pavan Kumar、Naveen Patil等） 工作人员：-

艾弗aaa

艾伦·德克

富尔顿·斯特朗

帕万·库马尔

纳文帕蒂尔

我面临的主要问题是，我已经删除了像Ivor aaa、alan decker和Fulton strong这样的员工价值观，但它仍然显示在价值观列表中。我如何摆脱这些价值观

我试过了

---

staff.objects.all.delete（）但列表中仍有Ivor aaa、alan decker和fulton strong等值

staff.objects.all（）.delete（）可以显示相关模板吗？您的

staff\u id

是一个FK to

CustomUser

模型。它将列出您的用户，而不是您的

staff

模型中的实例。