Django的模型并不阿贾克斯序列化 [英] Django models are not ajax serializable
问题描述
我有我使用的尝试AJAX一个简单的观点。
I have a simple view that I'm using to experiment with AJAX.
def get_shifts_for_day(request,year,month,day):
data= dict()
data['d'] =year
data['e'] = month
data['x'] = User.objects.all()[2]
return HttpResponse(simplejson.dumps(data), mimetype='application/javascript')
这将返回以下内容:
TypeError at /sched/shifts/2009/11/9/
<User: someguy> is not JSON serializable
如果我拿出数据['X']行,这样我不是引用它的工作原理任何模型和返回这一点:
If I take out the data['x'] line so that I'm not referencing any models it works and returns this:
{"e": "11", "d": "2009"}
为什么不能simplejson分析我的默认的Django的车型之一?我与我使用任何型号相同的行为。
Why can't simplejson parse my one of the default django models? I get the same behavior with any model I use.
推荐答案
您只需要添加,在你的 .dumps
呼叫,默认= EN code_myway
参数让 simplejson
知道,当你将它传递数据的类型,它不知道该怎么办 - 回答你的为什么的问题,当然,你还没有的告诉的差 simplejson
做什么用的模型的实例之一。
You just need to add, in your .dumps
call, a default=encode_myway
argument to let simplejson
know what to do when you pass it data whose types it does not know -- the answer to your "why" question is of course that you haven't told poor simplejson
what to DO with one of your models' instances.
当然,你需要写连接code_myway
来提供JSON-可编码的数据,如:
And of course you need to write encode_myway
to provide JSON-encodable data, e.g.:
def encode_myway(obj):
if isinstance(obj, User):
return [obj.username,
obj.firstname,
obj.lastname,
obj.email]
# and/or whatever else
elif isinstance(obj, OtherModel):
return [] # whatever
elif ...
else:
raise TypeError(repr(obj) + " is not JSON serializable")
基本上,JSON知道非常基本数据类型(字符串,整型和浮点型,组合成字典和列表) - 这是作为一个程序员你的责任,从这些基本数据类型匹配一切为/,而在 simplejson
通过传递给默认=
函数的转储
或转储
的时间。
Basically, JSON knows about VERY elementary data types (strings, ints and floats, grouped into dicts and lists) -- it's YOUR responsibility as an application programmer to match everything else into/from such elementary data types, and in simplejson
that's typically done through a function passed to default=
at dump
or dumps
time.
另外,你可以使用 JSON
串行这是Django的一部分,看到的的文档。
Alternatively, you can use the json
serializer that's part of Django, see the docs.
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