类型错误:ObjectId('') 不是 JSON 可序列化的 [英] TypeError: ObjectId('') is not JSON serializable

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，它返回有效响应，我可以打印它但无法返回它.

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.

错误:

TypeError: ObjectId('51948e86c25f4b1d1c0d303c') is not JSON serializable

打印:

{'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}

但是当我尝试返回时:

TypeError: ObjectId('51948e86c25f4b1d1c0d303c') is not JSON serializable

这是 RESTfull 调用:

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 连接良好，集合也在那里，我得到了有效的预期结果，但是当我尝试返回时，它给了我 Json 错误.知道如何将响应转换回 JSON.谢谢

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 JSON. Thanks

推荐答案

你应该定义你自己的 JSONEncoder 并使用它:

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)

也可以通过以下方式使用.

It's also possible to use it in the following way.

json.encode(analytics, cls=JSONEncoder)

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