DynamoDB scan（）ResultSet沒有屬性鍵

Question

我使用掃描來查詢兩個發電機數據庫表，將它們存儲在列表中，然後將它們返回（所有這些都在Flask應用程序中）。很簡單，沒有什麼幻想。

的問題是，對於一個它的工作原理沒有問題，但對於其他的我得到這個：

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' 

這裏是第一次掃描代碼：

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) 

這裏是失敗的掃描碼。

@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) 

兩個表都有在其中的至少一種元素。區別在於第一個返回結果，而第二個不是。任何幫助將不勝感激。乾杯!

Answer 1

問題在於使用DynamoDB版本1（即棄用的版本）。一旦我切換到與表格的新版本連接並使用適當的方法執行掃描，它就可以工作。

希望這可以幫助那些因交叉版本不匹配而感到困惑的其他受折磨的靈魂。