问题描述
我在使用Python查询文档上的聚合函数后,从MongoDB返回的响应,它返回有效的响应,我可以打印它,但不能返回它。
TypeError:ObjectId('51948e86c25f4b1d1c0d303c')不是JSON可序列化的
$ b $ p $ p $ {code $ {'result':[{'_id ':ObjectId('51948e86c25f4b1d1c0d303c'),'api_calls_with_key':4,'api_calls_per_day':0.375,'api_calls_total':6,'api_calls_without_key':2}],'ok':1.0}
$ c $
> TypeError:ObjectId('51948e86c25f4b1d1c0d303c')不是JSON可串行化
这是RESTfull调用:
@ appv1.route('/ v1 / analytics')
def get_api_analytics():
# MongoDB中的集合
statistics = sldb.statistics
objectid = ObjectId( 51948e86c25f4b1d1c0d303c)
analytics = statistics.aggregate([
{'$ match':{'owner':objectid}},
{'$ project':{所有者':$ owner,
'api_calls_with_key':{'$ cond':[{'$ eq':[$ apikey,None]},0,1]},
' api_calls_without_key':{'$ cond':['$ ne':[$ apikey,None]},0,1]}
}},
{'$ group':{ _id':$ owner,
'api_calls_with_key':{'$ sum':$ api_calls_with_key},
'api_calls_without_key':{'$ sum':$ api_calls_without_key} $ b $ $'$'$'$'$'$'$'$'$'$'$'$'$'$'$'$'$'$'$'$'$'$'$'$'$'$' :[$ api_calls_with_key,$ api_calls_without_key]},
'api_calls_per_day':{'$ divide':['$ api_calls_with_key,'$ api_calls_without_key]},{' $ dayOfMonth':datetime.now()}]},
}}
])
print(分析)
返回分析
您应该定义您自己的并使用它:
<$ $ b $ import $ b $ import
$ def $ $ b如果isinstance(o,ObjectId):
返回str(o)
返回json.JSONEncoder.default(self,o)
JSONEncoder()。encode(analytics)
也可以按以下方式使用它。
json.encode(analytics,cls = JSONEncoder)
My response back from MongoDB after querying an aggregated function on document using Python, It returns valid response and i can print it but can not return it.
Error:
TypeError: ObjectId('51948e86c25f4b1d1c0d303c') is not JSON serializable
Print:
{'result': [{'_id': ObjectId('51948e86c25f4b1d1c0d303c'), 'api_calls_with_key': 4, 'api_calls_per_day': 0.375, 'api_calls_total': 6, 'api_calls_without_key': 2}], 'ok': 1.0}
But When i try to return:
TypeError: ObjectId('51948e86c25f4b1d1c0d303c') is not JSON serializable
It is RESTfull call:
@appv1.route('/v1/analytics')
def get_api_analytics():
# get handle to collections in MongoDB
statistics = sldb.statistics
objectid = ObjectId("51948e86c25f4b1d1c0d303c")
analytics = statistics.aggregate([
{'$match': {'owner': objectid}},
{'$project': {'owner': "$owner",
'api_calls_with_key': {'$cond': [{'$eq': ["$apikey", None]}, 0, 1]},
'api_calls_without_key': {'$cond': [{'$ne': ["$apikey", None]}, 0, 1]}
}},
{'$group': {'_id': "$owner",
'api_calls_with_key': {'$sum': "$api_calls_with_key"},
'api_calls_without_key': {'$sum': "$api_calls_without_key"}
}},
{'$project': {'api_calls_with_key': "$api_calls_with_key",
'api_calls_without_key': "$api_calls_without_key",
'api_calls_total': {'$add': ["$api_calls_with_key", "$api_calls_without_key"]},
'api_calls_per_day': {'$divide': [{'$add': ["$api_calls_with_key", "$api_calls_without_key"]}, {'$dayOfMonth': datetime.now()}]},
}}
])
print(analytics)
return analytics
db is well connected and collection is there too and I got back valid expected result but when i try to return it gives me Json error. Any idea how to convert the response back into JOSON. Thanks
You should define you own JSONEncoder
and using it:
import json
from bson import ObjectId
class JSONEncoder(json.JSONEncoder):
def default(self, o):
if isinstance(o, ObjectId):
return str(o)
return json.JSONEncoder.default(self, o)
JSONEncoder().encode(analytics)
It's also possible to use it in the following way.
json.encode(analytics, cls=JSONEncoder)
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