无法从Cherrypy将datetime作为JSON序列化 [英] Cannot serialize datetime as JSON from Cherrypy
问题描述
我正在尝试发送一个响应于Ajax查询的记录列表。这样做很好,除非结果包含datetime字段,当我的进程失败,错误 datetime.date(2011,11,1)不是JSON可序列化
。 b
$ b
我尝试将我发现的答案结合到一个非常类似问题,其中包含 CherryPy文档到使用自定义的json_out编码器,但我不清楚这个函数必须具有什么签名。我写的功能是:
def json_encoder(thing):
如果hasattr(thing, isoformat'):
return thing.isoformat()
else:
return str(thing)
和现在使用json_out(即使在输出中没有datetime)给我错误 TypeError:json_encoder()只需要一个参数( 0给定)
。但是如果编码器没有参数,那么它如何接收编码的对象?
(另外,我假设我使用 str (事情)
作为编码的默认方法是错误的,这应该是通过调用任何json编码的默认处理程序,但我不知道如何调用该方法)。
我在类似的情况下做下一个:
class DecimalEncoder(json.JSONEncoder):
def default(self,obj):
if isinstance(obj,Decimal):
return float(obj)
return json.JSONEncoder.default(self,obj)
在通话中: p>
json.dumps(my_variable,cls = DecimalEncoder)
所以在你的情况下,它应该像:
class DateEncoder(json.JSONEncoder )
def default(self,obj):
if hasattr(obj,'isoformat'):
return obj.isoformat()
else:
return str(obj)
return json.JSONEncoder.default(self,obj)
json。转储(my_variable,cls = DateEncoder)
I'm attempting to send a list of records in response to an Ajax query. This works well unless the results include a datetime field when my process fails with the error datetime.date(2011, 11, 1) is not JSON serializable
.
I attempted to combine the answer I found to a very similar question here with instructions in the CherryPy documentation to use a custom json_out encoder, but it's not clear to me what signature that function must have. The function I wrote is:
def json_encoder(thing):
if hasattr(thing, 'isoformat'):
return thing.isoformat()
else:
return str(thing)
and now any use of json_out (even with no datetime in the output) gives me the error TypeError: json_encoder() takes exactly 1 argument (0 given)
. But if the encoder doesn't take an argument, how does it receive the object to encode?
(Also, I assume my use of str(thing)
as the default method of encoding is wrong and that this should be done with a call to whatever the default handler for json encoding is, but I'm not sure how to call that method).
I do the next in a similar case:
class DecimalEncoder(json.JSONEncoder):
def default(self, obj):
if isinstance(obj, Decimal):
return float(obj)
return json.JSONEncoder.default(self, obj)
and at the call:
json.dumps(my_variable, cls=DecimalEncoder)
So in your case it should be like:
class DateEncoder(json.JSONEncoder):
def default(self, obj):
if hasattr(obj, 'isoformat'):
return obj.isoformat()
else:
return str(obj)
return json.JSONEncoder.default(self, obj)
json.dumps(my_variable, cls=DateEncoder)
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