amazon web services - DynamoDB scan() ResultSet没有属性键

Question

我正在使用scan查询两个dynamo db表来获取里面的所有项目，将它们存储在一个列表中，然后返回它们(所有这些都在Flask应用程序中)。很简单，没什么特别的。

问题是，对于一个它工作没有问题，但对于另一个我得到这个:

for entry in squads_info:
File "/usr/local/lib/python2.7/site-packages/boto/dynamodb/layer2.py", line 125, in __iter__
response = self.response
File "/usr/local/lib/python2.7/site-packages/boto/dynamodb/layer2.py", line 92, in response
return self.next_response() if self._response is None else self._response
File "/usr/local/lib/python2.7/site-packages/boto/dynamodb/layer2.py", line 104, in next_response
self._response = self.callable(**self.kwargs)
File "/usr/local/lib/python2.7/site-packages/boto/dynamodb/layer1.py", line 577, in scan
return self.make_request('Scan', json_input, object_hook=object_hook)
File "/usr/local/lib/python2.7/site-packages/boto/dynamodb/layer1.py", line 127, in make_request
return json.loads(response_body, object_hook=object_hook)
File "/usr/local/lib/python2.7/json/__init__.py", line 351, in loads
return cls(encoding=encoding, **kw).decode(s)
File "/usr/local/lib/python2.7/json/decoder.py", line 366, in decode
obj, end = self.raw_decode(s, idx=_w(s, 0).end())
File "/usr/local/lib/python2.7/json/decoder.py", line 382, in raw_decode
obj, end = self.scan_once(s, idx)
File "/usr/local/lib/python2.7/site-packages/boto/dynamodb/types.py", line 347, in decode
return decoder(attr[dynamodb_type])
File "/usr/local/lib/python2.7/site-packages/boto/dynamodb/types.py", line 377, in _decode_l
return [self.decode(i) for i in attr]
File "/usr/local/lib/python2.7/site-packages/boto/dynamodb/types.py", line 338, in decode
dynamodb_type = list(attr.keys())[0]
AttributeError: 'unicode' object has no attribute 'keys'

下面是第一次扫描的代码:

def get_browsers():
    # the database table instance that can be scanned
    browsers = get_table_connection('Browser')
    # a list of the environments in the table
    browser_list = []
    # getting the full list of environments in the table
    results = browsers.scan()
   # add a dictionary entry for each result we get
   for result in results:
       entry = {
           "name": result['name'],
           "versions": result['versions']
        }
        browser_list.append(entry)
   # return the env_list 
   return jsonify(result=browser_list)

这是失败的扫描码。

@logger_app.route("/squad-information", methods=['GET'])
def get_squad_info():
   # get connection to db
   squads = get_table_connection('Squad')
   # we need to return all the information we have stored in this table, so a    scan should do
   squads_info = squads.scan()

   # start building up the response
   # response is an array of dictionaries
   response = []
   for entry in squads_info:
      response_entry = {
          "name": entry['name'],
          "squad_id": entry['squad_id'],
          "test_suites": entry['test_suites']
      }
      response.append(response_entry)
return jsonify(squads=response)

两个表中至少有一个元素。区别在于第一个返回结果，而第二个没有。任何帮助都会非常感激。干杯!

Answer 1

问题是使用DynamoDB版本1(即弃用的一个)。一旦我切换到连接新版本的表并使用适当的方法执行扫描，它就工作了。

希望这可以帮助那些被跨版本不匹配所困扰的灵魂。