AttributeError：“list”对象在 App Engine 中没有属性“has_key”

我在应用程序引擎的批量加载器方面遇到一些问题。下面我插入了bulkloader.yaml、hs_transformers.py 和错误日志。知道是什么产生了这个错误吗？我的hs_transformer如果我返回单个实体（只是一个实体，而不是其中包含一个实体的列表，也会引发错误），则该函数有效，但是当我尝试返回实体列表时，会发生此错误。根据应用程序引擎的文档，我应该能够返回实体列表。

.yaml 文件：

python_preamble:
- import: re
- import: base64
- import: google.appengine.ext.bulkload.transform
- import: google.appengine.ext.bulkload.bulkloader_wizard
- import: google.appengine.ext.db
- import: google.appengine.api.datastore
- import: hs_transformers
- import: datetime


transformers:

- kind: HBO
  connector: csv

  property_map:
    - property: __key__
      external_name: swfServerID
      import_transform: hs_transformers.string_null_converter

    - property: IP_address
      external_name: IP
      import_transform: hs_transformers.string_null_converter 

    - property: name
      external_name: swfServer
      import_transform: hs_transformers.swf_server_converter

    - property: last_checkin_date
      external_name: clockStampOfLastCheckin
      import_transform: hs_transformers.clock_stamp_of_last_checkin_converter

#    - property: last_update
#      external_name: clockStampOfLastUpdate
#      import_transform: transform

    - property: form_factor
      external_name: formFactor
      import_transform: hs_transformers.string_null_converter

    - property: serial_number
      external_name: serialNumber
      import_transform: hs_transformers.string_null_converter

    - property: allow_reverse_SSH
      external_name: allowReverseSSH
      import_transform: hs_transformers.boolean_converter

    - property: insight_account
      external_name: FK_insightAccountID
      import_transform: hs_transformers.integer_converter

    - property: version
      external_name: ver
      import_transform: hs_transformers.string_null_converter

  post_import_function: hs_transformers.post_hbo 

hs_transformers.py

def post_hbo(input_dict, entity_instance, bulkload_state):  
    return_entities = []

    model_key = db.Key.from_path("Contact", 1)
    logging.error("MODEL KEY " +str(model_key))
    logging.error("MODEL KEY TYPE " +str(type(model_key)))
    keys = db.allocate_ids(model_key, 1)
    logging.error("KEYS " +str(keys))
    logging.error("KEYS TYPE " +str(type(keys)))
    id = keys[0]
    logging.error("ID " +str(id))
    logging.error("ID TYPE " +str(type(id)))

    contact_key = db.Key.from_path("Contact", id)
    logging.error("CONTACT KEY " +str(contact_key))
    logging.error("CONTACT KEY TYPE " +str(type(contact_key)))
    hbo_key =  db.Key.from_path("HBO", input_dict["swfServerID"])
    logging.error("HBO KEY " +str(hbo_key))
    logging.error("HBO KEY TYPE " +str(type(hbo_key)))

    contact = Contact(key=contact_key)

    map = HBOContact()
    map.hbo = hbo_key
    map.contact = contact_key

    return_entities.append(contact)
    return_entities.append(map)

    logging.error("CONTACT KEY AGAIN? " +str(contact.key()))
    logging.error("CONTACT TYPE " +str(type(contact)))
    logging.error("MAP TYPE " +str(type(map)))

    logging.error("RETURN LIST " + str(return_entities))

    return return_entities

最后

Microsoft Windows [Version 6.1.7600]
Copyright (c) 2009 Microsoft Corporation.  All rights reserved.

C:\Users\Jack Frost>cd..

C:\Users>cd..

C:\>cd "Program Files (x86)"

C:\Program Files (x86)>cd "Google App Engine SDK"

C:\Program Files (x86)\Google App Engine SDK>python appcfg.py upload_data --url=http://bulkloader-testing.appspot.com/remote_api --config_file="C:\Users\Jack Frost\Eclipse Workspace\Headsprout\GAE 1.27.2012\src\utilities\bulkloader\bulkloader.yaml" --filename="C:\Users\Jack Frost\Eclipse Workspace\Headsprout\GAE 1.27.2012\src\utilities\bulkloader\csv_files\smallhbos.csv" --kind=HBO
Uploading data records.
[INFO    ] Logging to bulkloader-log-20120131.160426
[INFO    ] Throttling transfers:
[INFO    ] Bandwidth: 250000 bytes/second
[INFO    ] HTTP connections: 8/second
[INFO    ] Entities inserted/fetched/modified: 20/second
[INFO    ] Batch Size: 10
[INFO    ] Opening database: bulkloader-progress-20120131.160426.sql3
[INFO    ] Connecting to bulkloader-testing.appspot.com/remote_api
[INFO    ] Starting import; maximum 10 entities per post
2012-01-31 16:04:27,135 ERROR hs_transformers.py:66 type object 'datetime.datetime' has no attribute 'datetime'
2012-01-31 16:04:27,137 ERROR hs_transformers.py:17 MODEL KEY ahRzfmJ1bGtsb2FkZXItdGVzdGluZ3INCxIHQ29udGFjdBgBDA
2012-01-31 16:04:27,138 ERROR hs_transformers.py:18 MODEL KEY TYPE <class 'google.appengine.api.datastore_types.Key'>
2012-01-31 16:04:27,461 ERROR hs_transformers.py:20 KEYS (16031L, 16031L)
2012-01-31 16:04:27,463 ERROR hs_transformers.py:21 KEYS TYPE <type 'tuple'>
2012-01-31 16:04:27,463 ERROR hs_transformers.py:23 ID 16031
2012-01-31 16:04:27,464 ERROR hs_transformers.py:24 ID TYPE <type 'long'>
2012-01-31 16:04:27,466 ERROR hs_transformers.py:27 CONTACT KEY ahRzfmJ1bGtsb2FkZXItdGVzdGluZ3IOCxIHQ29udGFjdBiffQw
2012-01-31 16:04:27,466 ERROR hs_transformers.py:28 CONTACT KEY TYPE <class 'google.appengine.api.datastore_types.Key'>
2012-01-31 16:04:27,467 ERROR hs_transformers.py:30 HBO KEY ahRzfmJ1bGtsb2FkZXItdGVzdGluZ3IKCxIDSEJPIgEzDA
2012-01-31 16:04:27,467 ERROR hs_transformers.py:31 HBO KEY TYPE <class 'google.appengine.api.datastore_types.Key'>
2012-01-31 16:04:27,469 ERROR hs_transformers.py:42 CONTACT KEY AGAIN? ahRzfmJ1bGtsb2FkZXItdGVzdGluZ3IOCxIHQ29udGFjdBiffQw
2012-01-31 16:04:27,469 ERROR hs_transformers.py:43 CONTACT TYPE <class 'shared.datastore.Contact'>
2012-01-31 16:04:27,470 ERROR hs_transformers.py:44 MAP TYPE <class 'shared.datastore.HBOContact'>
2012-01-31 16:04:27,470 ERROR hs_transformers.py:46 RETURN LIST [<shared.datastore.Contact object at 0x0000000003DBBB00>, <shared.datastore.HBOContact object at 0x0000000003DBBC18>]
[ERROR   ] [WorkerThread-0] WorkerThread:
Traceback (most recent call last):
  File "C:\Program Files (x86)\Google App Engine SDK\google\appengine\tools\adaptive_thread_pool.py", line 176, in WorkOnItems
status, instruction = item.PerformWork(self.__thread_pool)
  File "C:\Program Files (x86)\Google App Engine SDK\google\appengine\tools\bulkloader.py", line 764, in PerformWork
transfer_time = self._TransferItem(thread_pool)
  File "C:\Program Files (x86)\Google App Engine SDK\google\appengine\tools\bulkloader.py", line 933, in _TransferItem
self.content = self.request_manager.EncodeContent(self.rows)
  File "C:\Program Files (x86)\Google App Engine SDK\google\appengine\tools\bulkloader.py", line 1394, in EncodeContent
entity = loader.create_entity(values, key_name=key, parent=parent)
  File "C:\Program Files (x86)\Google App Engine SDK\google\appengine\ext\bulkload\bulkloader_config.py", line 446, in create_entity
self.__track_max_id(entity)
  File "C:\Program Files (x86)\Google App Engine SDK\google\appengine\ext\bulkload\bulkloader_config.py", line 420, in __track_max_id
elif not entity.has_key():
AttributeError: 'list' object has no attribute 'has_key'
[INFO    ] [WorkerThread-1] Backing off due to errors: 1.0 seconds
[INFO    ] An error occurred. Shutting down...
[ERROR   ] Error in WorkerThread-0: 'list' object has no attribute 'has_key'

[INFO    ] 9 entities total, 0 previously transferred
[INFO    ] 0 entities (2364 bytes) transferred in 1.5 seconds
[INFO    ] Some entities not successfully transferred

还以为我会粘贴 code.google.com 关于 post_import_function 的内容

post_import_function（input_dict，实例，bulkload_state_copy）函数名称

您的函数必须返回以下内容之一： None，这意味着跳过导入此记录；单个实体（通常是传入的实例参数）；或要导入的多个实体的列表。

当我注释掉 post_import_transform 函数中的所有代码并只写 return None 时，我仍然遇到相同的错误；然而，这与 code.google.com 矛盾。

http://code.google.com/appengine/docs/python/tools/uploadingdata.html http://code.google.com/appengine/docs/python/tools/uploadingdata.html

浏览了相关代码，看起来像是一个错误。

您的导入后功能在其中运行dict_to_entity http://code.google.com/p/googleappengine/source/browse/trunk/python/google/appengine/ext/bulkload/bulkloader_config.py#131，它只返回函数返回的任何内容。create_entity http://code.google.com/p/googleappengine/source/browse/trunk/python/google/appengine/ext/bulkload/bulkloader_config.py#430喂什么dict_to_entity返回到__track_max_id http://code.google.com/p/googleappengine/source/browse/trunk/python/google/appengine/ext/bulkload/bulkloader_config.py#406，这似乎没有正确解释列表或无。

我建议您将此作为错误归档App Engine 问题跟踪器 http://code.google.com/p/googleappengine/issues/entry.

请注意，您可以在本地 SDK 中轻松修复此问题。基本上改变__track_max_id看起来像：

def __track_max_id(self, entity):
  """Check the entity to see it has a numeric ID higher than any seen so far.

  High IDs are stored in self.high_ids[path-to-entity-kind].
  They are not tracked if self.increment_id is None.

  Args:
    entity: An entity with a key.
  """
  if not self.increment_id:
    return
  if not entity:
    return

  if isinstance(entity, datastore.Entity):
    entities = [entity]
  else:
    entities = entity

  for entity in entities:
    if not entity.key():
      continue
    key = entity.key()
    key_id = key.id()
    if not key_id:
      continue
    path = tuple(key.to_path()[:-1])
    if self.high_ids.get(path, 0) < key_id:
      self.high_ids[path] = key_id