Question

如何为登录（student = self.request.user.id）的学生撰写查询以查看其作业标题（属于他的摄入量）

    class intake(models.Model):
    intakecode = models.CharField(max_length=100)
    modules = models.ManyToManyField(Module, through='IntakeDetails')

    class Student(models.Model):
    user = models.OneToOneField(UserType, on_delete=models.CASCADE, 
    primary_key=True)
    intakecode = models.ForeignKey(intake, on_delete=models.CASCADE)

学生属于摄入量，每个摄入量很多。

    class IntakeDetails(models.Model):
    intake = models.ForeignKey(intake, on_delete=models.CASCADE)
    lecturer = models.ForeignKey(Lecturer, on_delete=models.CASCADE)
     module= models.ForeignKey(Module, on_delete=models.CASCADE)

    class AssignAssignment(models.Model):
    title=models.CharField(max_length=30)
    duedate=models.DateField()
intakedetails=models.ForeignKey(IntakeDetails,on_delete=models.CASCADE,null=True)

我试过这个，但是如果有多个intakedetails，则会弹出错误。

@login_required
class ModelIndexView(ListView):
template_name= 'accounts/students/students.html'
context_object_name= 'students'
def get_queryset(self):
    student = self.request.user.id
    student_det = Student.objects.get(user_id=student)
    assignment=IntakeDetails.objects.get(intake_id=student_det.intakecode)
    queryset=AssignAssignment.objects.filter(intakedetails_id=assignment.id)
    return queryset

Answer 1

因为当您使用objects.get时，应该只有一行符合您的查询。没有行或多行result in errors - ObjectDoesNotExist和MultipleObjectsReturned。

您可以使用此查询来获得所需的结果：

AssignAssignment.objects.filter(intakedetails__intake_id=Student.objects.get(user_id=student).intakecode)

如何在Django中用多个模型编写查询

1 个答案: