我正在测试将 NonRel for App Engine 从 1.3 升级到 1.4。它在本地运行良好，但是当我部署到 App Engine 时，在部署结束时出现 syncdb 错误：
Running syncdb.
2013-08-02 09:31:34,600 WARNING simple_search_stub.py:998 Could not read search indexes from /var/folders/fv/cdp4hprx5pbc_3bf5g0wbbkw0000gn/T/dev_appserver.searchindexes
Creating tables ...
The following content types are stale and need to be deleted:
auth | message
Any objects related to these content types by a foreign key will also
be deleted. Are you sure you want to delete these content types?
If you're unsure, answer 'no'.
Type 'yes' to continue, or 'no' to cancel: yes
Traceback (most recent call last):
File "manage.py", line 9, in <module>
execute_from_command_line(sys.argv)
File "/src/django/core/management/__init__.py", line 443, in execute_from_command_line
utility.execute()
File "/src/django/core/management/__init__.py", line 382, in execute
self.fetch_command(subcommand).run_from_argv(self.argv)
File "/src/djangoappengine/management/commands/deploy.py", line 72, in run_from_argv
run_appcfg(argv)
File "/src/djangoappengine/management/commands/deploy.py", line 51, in run_appcfg
call_command('syncdb', remote=True, interactive=True)
File "/src/django/core/management/__init__.py", line 150, in call_command
return klass.execute(*args, **defaults)
File "/src/django/core/management/base.py", line 232, in execute
output = self.handle(*args, **options)
File "/src/django/core/management/base.py", line 371, in handle
return self.handle_noargs(**options)
File "/src/django/core/management/commands/syncdb.py", line 110, in handle_noargs
emit_post_sync_signal(created_models, verbosity, interactive, db)
File "/src/django/core/management/sql.py", line 189, in emit_post_sync_signal
interactive=interactive, db=db)
File "/src/django/dispatch/dispatcher.py", line 172, in send
response = receiver(signal=self, sender=sender, **named)
File "/src/django/contrib/contenttypes/management.py", line 67, in update_contenttypes
ct.delete()
File "/src/django/db/models/base.py", line 599, in delete
collector.delete()
File "/src/django/db/models/deletion.py", line 61, in decorated
func(self, *args, **kwargs)
File "/src/django/db/models/deletion.py", line 261, in delete
query.delete_batch([obj.pk for obj in instances], self.using, field)
File "/src/django/db/models/sql/subqueries.py", line 44, in delete_batch
self.do_query(self.model._meta.db_table, where, using=using)
File "/src/django/db/models/sql/subqueries.py", line 29, in do_query
self.get_compiler(using).execute_sql(None)
File "/src/djangotoolbox/db/basecompiler.py", line 593, in execute_sql
self.build_query([self.query.get_meta().pk]).delete()
File "/src/djangoappengine/db/compiler.py", line 69, in _func
return func(*args, **kwargs)
File "/src/djangoappengine/db/compiler.py", line 168, in delete
Delete(keys)
File "/Applications/GoogleAppEngineLauncher.app/Contents/Resources/GoogleAppEngine-default.bundle/Contents/Resources/google_appengine/google/appengine/api/datastore.py", line 695, in Delete
return DeleteAsync(keys, **kwargs).get_result()
File "/Applications/GoogleAppEngineLauncher.app/Contents/Resources/GoogleAppEngine-default.bundle/Contents/Resources/google_appengine/google/appengine/api/datastore.py", line 674, in DeleteAsync
keys, _ = NormalizeAndTypeCheckKeys(keys)
File "/Applications/GoogleAppEngineLauncher.app/Contents/Resources/GoogleAppEngine-default.bundle/Contents/Resources/google_appengine/google/appengine/api/datastore.py", line 176, in NormalizeAndTypeCheckKeys
keys, multiple = NormalizeAndTypeCheck(keys, (basestring, Entity, Key))
File "/Applications/GoogleAppEngineLauncher.app/Contents/Resources/GoogleAppEngine-default.bundle/Contents/Resources/google_appengine/google/appengine/api/datastore.py", line 143, in NormalizeAndTypeCheck
arg_list = list(arg)
File "/src/djangoappengine/db/compiler.py", line 105, in fetch
query = self._build_query()
File "/src/djangoappengine/db/compiler.py", line 69, in _func
return func(*args, **kwargs)
File "/src/djangoappengine/db/compiler.py", line 322, in _build_query
return MultiQuery(self.gae_query, self.ordering)
File "/Applications/GoogleAppEngineLauncher.app/Contents/Resources/GoogleAppEngine-default.bundle/Contents/Resources/google_appengine/google/appengine/api/datastore.py", line 1998, in __init__
'MultiQuery does not support keys_only.')
django.db.utils.DatabaseError: MultiQuery does not support keys_only.
我可以通过删除本地开发服务器上的内容类型来解决它，但我想知道为什么会出现此错误。我确实理解异常的含义，但不明白为什么 NonRel 没有调整 Django 以在 App Engine 中正确执行此操作？