Question

尝试访问class MonthControlRecord(models.Model): STATUS_CHOICES = ( (0, 'Open'), (1, 'Locked'), (2, 'Closed'), ) employee = models.ForeignKey(Employee, on_delete=models.CASCADE) first_day_of_month = models.DateField() status = models.IntegerField(choices=STATUS_CHOICES, default=0) @property def get_year_month(self): return self.first_day_of_month.year, self.first_day_of_month.month def __str__(self): return self.employee, self.first_day_of_month个对象的年和月属性时，我收到错误

属性错误：＆＃39; str＆＃39;对象没有属性＆＃39; date＆＃39;。

我认为DateField对象被保存为Python Datetime对象而不是字符串。

这是models.py：

employee = Employee.objects.get(staff_number="0001")
mcr = MonthControlRecord(employee=employee, first_day_of_month="2015-12-01")
mcrYearMonth = mcr.get_year_month

和tests.py：

Traceback (most recent call last):
  File "/Users/James/Django/MITS/src/timesheet/tests.py", line 87, in test_new_month_control_record
    mcrYearMonth = mcr.get_year_month
  File "/Users/James/Django/MITS/src/timesheet/models.py", line 54, in get_year_month
    return self.first_day_of_month.year, self.first_day_of_month.month
AttributeError: 'str' object has no attribute 'year'

和错误：

{{1}}

Answer 1

在测试中，您将日期设置为字符串：

mcr = MonthControlRecord(employee=employee, first_day_of_month="2015-12-01")

尝试将其设为日期：

your_date = datetime.date(2015, 12, 1)
mcr = MonthControlRecord(employee=employee, first_day_of_month=your_date)

Answer 2

此问题的解决方案是在模型上调用full_clean（），这会将字段规范化为DateTime对象。

employee = Employee.objects.get(staff_number="0001")
mcr = MonthControlRecord(employee=employee, first_day_of_month="2015-12-01")
mcr.full_clean()
mcrYearMonth = mcr.get_year_month

DateField＆＃39; str＆＃39;对象没有属性＆＃39; year＆＃39;

2 个答案: