Question

任何机构都可以建议我如何比较django-admin中的两个日期字段我是管理员，我想说每当我更新日期字段的日期时，其他日期字段也必须更改（加上第一天的30天），如果第二个日期字段已更改，我想更改另一个字段只是在django管理页面！提前谢谢

STATUS_CHOICES = (
    ('P', 'Paid'),
    ('U', 'UNPAID'),
)
class Users(models.Model):
    status              = models.CharField(max_length=1, choices=STATUS_CHOICES , default="U")
    updated             = models.DateTimeField(default=now)
    expiry              = models.DateTimeField(default=updated_plus_30_days())
    # updated_plus_30_days():
        # if updated = "12/8/2017" and expiry is equal to "12/09/2017" and then i changed
        # the updated field to be equal to "12/12/2017" then expiry have to equal to "12/1/2018"
        # if the updated field is >= than expiray then expiray have to increase one month and check
            # if status  is == p:
            #    status = u
            # else :
            #   status = u

Answer 1

你可以试试这样的事情。

from datetime import datetime

#pip install python-dateutil
from dateutil.relativedelta import relativedelta


class Users(models.Model):
    status              = models.CharField(max_length=1, choices=STATUS_CHOICES , default="U")
    updated             = models.DateTimeField(default=now)
    expiry              = models.DateTimeField()

    def save(self, *args, **kwargs):
        self.expiry = self.updated + relativedelta(days=30)
        super(Users, self).save(*args, **kwargs)

Answer 2

你好，你可以查看这个

STATUS_CHOICES = (
('P', 'Paid'),
('U', 'UNPAID'),
)
from datetime import datetime, timedelta
class Users(models.Model):
    status              = models.CharField(max_length=1, choices=STATUS_CHOICES , default="U")
    updated             = models.DateTimeField(default=now)
    expiry              = models.DateTimeField()
    def save(self):
         self.expiry = default=self.updated+timedelta(days=30)
         super(Users, self).save()

比较django中的2个日期字段

2 个答案: