Django:类型为'datetime'的对象不可JSON序列化 [英] Django: Object of type 'datetime' is not JSON serializable
问题描述
我正在尝试在会话中保存日期.我总是收到错误类型'datetime'的对象不是JSON可序列化的
.我在这里在Django文档中:自日期起存储为秒,因为日期时间无法在JSON中序列化.
I'm trying to save a date in my sessions. I always receive the error Object of type 'datetime' is not JSON serializable
. I found this here in the Django documentation: stored as seconds since epoch since datetimes are not serializable in JSON.
如何将 expiry_date
保存为秒而不是日期时间?
How can I save my expiry_date
as seconds instead of datetime?
code = social_ticketing_form.cleaned_data['a']
expiry_date = timezone.now() + timezone.timedelta(days=settings.SOCIAL_TICKETING_ATTRIBUTION_WINDOW)
request.session[social_ticketing_cookie_name(request.event)] = {'code': code, 'expiry_date': expiry_date}
推荐答案
Either write your own session serialiser to allow you to serialise datetime
objects directly, or store the datetime
value in some other form.
如果要将其保存为秒,请使用 datetime.timestamp()
方法:
If you want to save it as seconds, then use the datetime.timestamp()
method:
request.session[social_ticketing_cookie_name(request.event)] = {
'code': code,
'expiry_date': expiry_date.timestamp()
}
您自己的 SESSION_SERIALIZER
类只需要提供与 json.loads()直接相似的
loads
和 dumps
方法.code>和 json.dumps()
(
Your own SESSION_SERIALIZER
class only needs to provide loads
and dumps
methods, directly analogous to json.loads()
and json.dumps()
(which is how the standard JSON serializer is implemented).
如果您想对 datetime
对象进行编码,并能够再次将它们透明地重新转换为 datetime
对象,则可以使用嵌套对象格式将这些值标记为特殊:
If you want to encode datetime
objects and be able to transparently turn those back into datetime
objects again, I'd use a nested object format to flag such values as special:
from datetime import datetime
class JSONDateTimeSerializer:
@staticmethod
def _default(ob):
if isinstance(ob, datetime):
return {'__datetime__': ob.isoformat()}
raise TypeError(type(ob))
@staticmethod
def _object_hook(d):
if '__datetime__' in d:
return datetime.fromisoformat(d['__datetime__'])
return d
def dumps(self, obj):
return json.dumps(
obj, separators=(',', ':'), default=self._default
).encode('latin-1')
def loads(self, data):
return json.loads(
data.decode('latin-1'), object_hook=self._object_hook
)
并将 SESSION_SERIALIZER
设置为上述模块的完整限定名称( path.to.module.JSONDateTimeSerializer
).
and set SESSION_SERIALIZER
to the full qualified name of the above module (path.to.module.JSONDateTimeSerializer
).
以上内容使用 datetime.fromisoformat()
方法,Python 3.7中的新功能.
The above uses the datetime.fromisoformat()
method, new in Python 3.7.
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