Question

class Session(models.Model):
  tutor = models.ForeignKey(User)
  start_time = models.DateTimeField()
  end_time = models.DateTimeField()

始终阻止start_time重叠end_time的最佳方法是什么？

Answer 1

首先，您应该在表单级别执行此操作，有关如何执行此操作的说明，请参阅Cleaning and validating fields that depend on each other，它将如下所示：

def clean(self):
    cleaned_data = super(YourForm, self).clean()
    if cleaned_data['start_time'] > cleaned_data['end_time']:
        raise forms.ValidationError(_(u'Start time must be before end time'))

此外，您可以在保存方法或pre_save signal中以较低级别强制执行此操作：

from django.db.models import signals

class StartTimeAfterEndTimeException(Exception):
    def __init__(self, model):
        super(StartTimeAfterEndTimeException, self).__init__(
            'Start time %s should not be after end time %s' % (
                model.start_time, model.end_time))

def session_force_end_time(sender, instance, **kwargs):
    if instance.start_time >= instance.end_time:
        raise StartTimeAfterEndTimeException(instance)
signals.pre_save.connect(session_force_end_time, sender=Session)

但这个级别很低，所以用户不友好。

Django - 防止日期范围重叠

1 个答案: