python - DRF : how to throttle a create request based on the amount of request's made in general and not per user

Question

我正在制作一个出勤系统，在这个系统中，教师和被允许的学生可以参加他们的类(class)，我希望每天一次，如果学生已经参加了，那么老师就不能参加了。

出勤模型

class Attendance(models.Model):
    Choices = (
        ("P", "Present"),
        ("A", "Absent"),
        ("L", "On leave"),
    )

    Student = models.ForeignKey(
        User, on_delete=models.CASCADE, blank=False, null=True)
    leave_reason = models.CharField(max_length=355, blank=True, null=True)
    Date = models.DateField(blank=False, null=True,
                            auto_now=False, auto_now_add=True)
    Presence = models.CharField(
        choices=Choices, max_length=255, blank=False, null=True)

    def __str__(self):
        return f'{self.Student}'

Answer 1

您可以使 Student 和 Date 的组合与 UniqueConstraint ^[Django-doc] 一起唯一:

class Attendance(models.Model):
    # …

    class Meta:
        constraints = [
            models.UniqueConstraint(<strong>fields=('Student', 'Date')</strong>, name='student_once_per_date')
        ]