DynamoDB scan（）ResultSet没有属性键

Question

我使用扫描来查询两个发电机数据库表，将它们存储在列表中，然后将它们返回（所有这些都在Flask应用程序中）。很简单，没有什么幻想。

的问题是，对于一个它的工作原理没有问题，但对于其他的我得到这个：

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' 

这里是第一次扫描代码：

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) 

这里是失败的扫描码。

@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) 

两个表都有在其中的至少一种元素。区别在于第一个返回结果，而第二个不是。任何帮助将不胜感激。干杯!

Answer 1

问题在于使用DynamoDB版本1（即弃用的版本）。一旦我切换到与表格的新版本连接并使用适当的方法执行扫描，它就可以工作。

希望这可以帮助那些因交叉版本不匹配而感到困惑的其他受折磨的灵魂。