siniy wrote:
> Hi all,
> I've downloaded today a new release of Django and played with json
> serialization. I found that if you use DateTime field the resulting
> json string contains only date, but not all datetime. So I viewed a
> source code of django/core/serializers/json.py and found that:
>
> def default(self, o):
> if isinstance(o, datetime.date):
> return o.strftime(self.DATE_FORMAT)
> elif isinstance(o, datetime.time):
> return o.strftime(self.TIME_FORMAT)
> elif isinstance(o, datetime.datetime):
> return o.strftime("%s %s" % (self.DATE_FORMAT,
> self.TIME_FORMAT))
> ....
>
> I know that isinstance(o, datetime.date) returns "True" even "o" is a
> datetime object. But I don't know - may be it's a python bug? My python
> version 2.4.3 from Ubuntu Dapper. So I replace parts of django code and
> all works as I want:
>
no, it's not a bug.
datetime.datetime inherits from datetime.
you can check it like this:
>>> datetime.datetime.__mro__
(<type 'datetime.datetime'>, <type 'datetime.date'>, <type 'object'>)
>>>
(mro is method-resolution-order)
as you see 'datetime' inherits from 'date', which inherits from 'object'.
and if you check the python-help, you'll see that
isinstance "Return whether an object is an instance of a class or of a
subclass thereof".
and because datetime is a subclass of date, isinstance returns True.
maybe you could try this:
if type(o) == type(datetime.datetime):
// your code here
gabor
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