[英]python json serialize datetime
First, a simple question on terms, 首先,一个关于条件的简单问题,
Encoding( json.dumps
) means, converting something to json string, Encoding(
json.dumps
)意味着将某些内容转换为json字符串,
decoding( json.loads
) means, converting json string to json type(?) json.loads
( json.loads
)意味着将json字符串转换为json类型(?)
I have a list of objects which I got from 我有从中得到的物品清单
>>> album_image_list = AlbumImage.objects.all().values(*fields)[offset:count]
>>> json.dumps(album_image_list[0], cls=DjangoJSONEncoder)
'{"album": 4, "album__title": "g jfd", "created_at": "2012-08-18T02:23:49Z", "height": 1024.0, "width": 512.0, "url_image": "http://--:8000/media/101ac908-df50-42cc-af6f-b172c8829a31.jpg"}'
but when I try the same on whole list (album_image_list),it fails... 但是当我在整个列表(album_image_list)上尝试相同时,它失败了...
>>> json.dumps(album_image_list, cls=DjangoJSONEncoder)
Traceback (most recent call last):
File "<console>", line 1, in <module>
File "/usr/lib/python2.6/json/__init__.py", line 237, in dumps
**kw).encode(obj)
File "/usr/lib/python2.6/json/encoder.py", line 367, in encode
chunks = list(self.iterencode(o))
File "/usr/lib/python2.6/json/encoder.py", line 317, in _iterencode
for chunk in self._iterencode_default(o, markers):
File "/usr/lib/python2.6/json/encoder.py", line 323, in _iterencode_default
newobj = self.default(o)
File "/home/--/virtualenvs/aLittleArtist/lib/python2.6/site-packages/django/core/serializers/json.py", line 75, in default
return super(DjangoJSONEncoder, self).default(o)
File "/usr/lib/python2.6/json/encoder.py", line 344, in default
raise TypeError(repr(o) + " is not JSON serializable")
TypeError: [{'album': 4L, 'album__title': u'g jfd', 'created_at': datetime.datetime(2012, 8, 18, 2, 23, 49, tzinfo=<UTC>), 'height': 1024.0, 'width': 512.0, 'url_image': u'http://--:8000/media/101ac908-df50-42cc-af6f-b172c8829a31.jpg'}, {'album': 4L, 'album__title': u'g jfd', 'created_at': datetime.datetime(2012, 8, 18, 1, 54, 51, tzinfo=<UTC>), 'height': 512.0, 'width': 512.0, 'url_image': u'http://--:8000/media/e85d1cf7-bfd8-4e77-b90f-d1ee01c67392.jpg'}] is not JSON serializable
>>>
Why does it succeed on one element and fails on the list? 为什么它在一个元素上成功而在列表上失败?
If you want to just dump a dictionary to JSON, just use json.dumps. 如果您只想将字典转储为JSON,请使用json.dumps。 It can easily be made to serialize objects by passing in a custom serialization class - there's one included with Django that deals with datetimes already:
可以通过传入自定义的序列化类来轻松地序列化对象-Django附带了一个已经处理日期时间的类:
from django.core.serializers.json import DjangoJSONEncoder
json.dumps(mydictionary, cls=DjangoJSONEncoder)
.values()
doesn't actually return a list. .values()
实际上并不返回列表。 It returns a ValuesQuerySet
which is not serializable by the json module. 它返回一个不能被json模块序列化的
ValuesQuerySet
。 Try converting album_image_list
to a list: 尝试将
album_image_list
转换为列表:
json.dumps(list(album_image_list), cls=DjangoJSONEncoder)
Which DjangoJSONEncoder you are using? 您正在使用哪个DjangoJSONEncoder? it looks like DjangoJSONEncoder may not support encoding list of results.
看起来DjangoJSONEncoder可能不支持结果的编码列表。
Try this: 尝试这个:
JSON Serializing Django Models with simplejson 使用simplejson对JSON模型进行JSON序列化
class DateTimeJSONEncoder(json.JSONEncoder):
def default(self, obj):
if isinstance(obj, datetime.datetime):
return obj.isoformat()
else:
return super(DateTimeJSONEncoder, self).default(obj)
updated_at=DateTimeJSONEncoder().encode(p.updated_at)
This will help you to serialize datetime object 这将帮助您序列化datetime对象
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