Django Import-Export导入错误- localtime()无法应用于初始日期时间

ttygqcqt  于 2023-01-14  发布在  Go
关注(0)|答案(1)|浏览(218)

使用:Python 3.10.4
Django 4.06
Django导入导出2.8.0
我正在尝试导入数据作为演示数据到我的django应用程序中。我一直得到一个错误localtime()不能应用于一个幼稚的日期时间(在解决了另一个我单独询问的错误之后)。我不担心这个特定的字段是幼稚的日期时间。它是一个需要在实际应用程序中手动设置的字段。

### models.py
class Reservation(models.Model):
    reservation = models.OneToOneField(Vehicle, on_delete=models.CASCADE, primary_key=True,)
    delivered = models.BooleanField('Delivered',default=False)
    date_reserved = models.DateTimeField('date reserved', default=datetime.datetime.now)
    ...

### admin.py
class ReservationResource(resources.ModelResource):
    class Meta:
        model = Reservation
        exclude = ('id',)
        import_id_fields = ('reservation',)
        fields = (
            'reservation',
            'delivered',
            'date_reserved',
            ...
        )
class ReservationImportExport(ImportExportModelAdmin):
    resource_class: ReservationResource
@admin.register(Reservation)
class ReservationAdmin(SimpleHistoryAdmin, ReservationImportExport):
    fields = ["delivered","date_reserved",...]

### demo-reservations.yaml  (Note: Problem happens using different data file formats)
 - reservation: 50001
   delivered: False
   date_reserved: 7/15/2022T00:00:00+00:00
   ...

以下是错误(稍微模糊)

Line number: 1 - localtime() cannot be applied to a naive datetime
50001, False, 7/15/2022T00:00:00+00:00, CHRIS EDWARDS, 16, ROSE TYLER
Traceback (most recent call last):
File "c:\Users\...\lib\site-packages\import_export\resources.py", line 670, in import_row
diff = self.get_diff_class()(self, original, new)
File "c:\Users\...\lib\site-packages\import_export\resources.py", line 221, in __init__
self.left = self._export_resource_fields(resource, instance)
File "c:\Users\...\lib\site-packages\import_export\resources.py", line 242, in _export_resource_fields
return [resource.export_field(f, instance) if instance else "" for f in resource.get_user_visible_fields()]
File "c:\Users\...\lib\site-packages\import_export\resources.py", line 242, in <listcomp>
return [resource.export_field(f, instance) if instance else "" for f in resource.get_user_visible_fields()]
File "c:\Users\...\lib\site-packages\import_export\resources.py", line 882, in export_field
return field.export(obj)
File "c:\Users\...\lib\site-packages\import_export\fields.py", line 125, in export
return self.widget.render(value, obj)
File "c:\Users\...\lib\site-packages\import_export\widgets.py", line 236, in render
value = timezone.localtime(value)
File "c:\Users\...\lib\site-packages\django\utils\timezone.py", line 206, in localtime
raise ValueError("localtime() cannot be applied to a naive datetime")
ValueError: localtime() cannot be applied to a naive datetime

已尝试:
1.从管理员注册中删除了SimpleHistoryAdmin
1.将导入字段变更为仅7/15/2022
1.从导入文件中删除字段
谢谢大家!

iezvtpos

iezvtpos1#

抱歉,我仔细读了一下:date_reserved = models.DateTimeField('date reserved', default=datetime.datetime.now)
这就导致了你的错误。你不必设置一个默认值,你可以这样做:models.DateTimeField(auto_now_add=True),它添加当前日期时间(知道),就像您尝试在那里做的那样。
这里还是我以前的回答:

from django.utils import timezone

tz = timezone.get_current_timezone()
aware_datetime = timezone.make_aware(datetime_object, tz)

这段代码应该可以解决你的问题。你必须解析你的日期时间字符串并将其插入make_aware
如果您仍然只使用日期,可以执行类似以下操作:

from datetime import datetime

datetime_object = datetime.strptime("7/15/2022", "%m/%d/%Y")
  • 这里是Django文档的链接,解释make_aware
  • 这里的链接解释了get_current_timezone(以及如果您在www.example.com中提供了一个时区,为什么您甚至不需要它settings.py)

您还可以向模型中添加一个函数,该函数可以自动将初始日期时间转换为感知日期时间check this answer(如果您希望实现此功能的话

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