AWS Lambda JSON到DynamoDB KeyError序列化JSON

问题描述：

我在AWS上设置了我的lambda函数，并希望将我的JSON插入到DynamoDB（NoSQL）中。我认为它与JSON（decimal_serializer）的序列化有关，但我可能是错的。感谢帮助！AWS Lambda JSON到DynamoDB KeyError序列化JSON

错误味精：

在序列化这个数据我获得以下错误

{ 
    "errorMessage": "'male_confidence'", 
    "errorType": "KeyError" 
}

JSON数据到INSERT：

{ 
    "device_id": "abc876", 
    "recorded_at": "1496136878", 
    "customers": [ 
    { 
     "male_confidence": "0.2", 
     "female_confidence": "0.8" 
    }, 
    { 
     "male_confidence:": "0.1", 
     "female_confidence": "0.9" 
    } 
    ] 
}

lambda函数处理程序

import boto3 
import json 

def lambda_handler(event, context): 
    # TODO implement 
    client = boto3.client('dynamodb') 
    for customer in event['customers']: 
     client.put_item(TableName="cv_data_1", Item={'device_id': {"S": event['device_id']}, 'male_confindence': {"N": customer['male_confidence']}, 'female_confidence': {"N": customer['female_confidence']}, "timestamp":{ "N": event['recorded_at']}}) 
    print('Successfully processed %s items.' % str(len(event['customers'])))

AWS输出日志错误（详细信息）：

During handling of the above exception, another exception occurred: 
 
09:23:38 
Traceback (most recent call last): 
 
09:23:38 
File "/var/runtime/awslambda/bootstrap.py", line 463, in <module> 
 
09:23:38 
main() 
 
09:23:38 
File "/var/runtime/awslambda/bootstrap.py", line 459, in main 
 
09:23:38 
handle_event_request(request_handler, invokeid, event_body, context_objs, invoked_function_arn) 
 
09:23:38 
File "/var/runtime/awslambda/bootstrap.py", line 240, in handle_event_request 
 
09:23:38 
result = to_json(result) 
 
09:23:38 
File "/var/runtime/awslambda/bootstrap.py", line 215, in to_json 
 
09:23:38 
return json.dumps(obj, default=decimal_serializer) 
 
09:23:38 
File "/var/lang/lib/python3.6/json/__init__.py", line 238, in dumps 
 
09:23:38 
**kw).encode(obj) 
 
09:23:38 
File "/var/lang/lib/python3.6/json/encoder.py", line 199, in encode 
 
09:23:38 
chunks = self.iterencode(o, _one_shot=True) 
 
09:23:38 
File "/var/lang/lib/python3.6/json/encoder.py", line 257, in iterencode 
 
09:23:38 
return _iterencode(o, 0) 
 
09:23:38 
File "/var/runtime/awslambda/bootstrap.py", line 104, in decimal_serializer 
 
09:23:38 
raise TypeError(repr(o) + " is not JSON serializable") 
 
09:23:38 
TypeError: <FrameSummary file /var/task/lambda_function.py, line 8 in lambda_handler> is not JSON serializable

从错误信息中可以看出''客户'之一的'male_confidence'缺失。（没有双关语意）。你可以在lambda处理程序中打印'event'，以便查看'event'包含的数据吗？输出将在cloudwatch日志中。 – nightgaunt

'{'device_id'：'abc876'，'recorded_at'：'1496136878'，'customers'：[{'male_confidence'：'0.2'，'female_confidence'：'0.8'}，{'male_confidence：'：'0.1 '，'female_confidence'：'0.9'}]}'，但是如果我在循环中输出'print（customer）'，它会返回下面的'dict''。 – zer02

我在循环中打印了'customer ['male_confidence']'，它返回了'0.2'，第二个循环打破了上面的错误。 – zer02

答

错字：

"male_confidence:": "0.1", 
    "female_confidence": "0.9"

“male_confidence：”

非常感谢！我疯了'：'。 – zer02

答

你有一个错字male_confidence:，后注意额外的:。试试这个

{ 
    "device_id": "abc876", 
    "recorded_at": "1496136878", 
    "customers": [ 
    { 
     "male_confidence": "0.2", 
     "female_confidence": "0.8" 
    }, 
    { 
     "male_confidence": "0.1", 
     "female_confidence": "0.9" 
    } 
    ] 
}

AWS Lambda JSON到DynamoDB KeyError序列化JSON

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