Django_norel錯誤「DatabaseWrapper」對象有沒有屬性「經營者」的AppEngine

Question

我使用django_norel並遵循所有的安裝方向，但我得到這個錯誤：

Exception Value: 
    'DatabaseWrapper' object has no attribute 'operators' 

當我去下面的視圖（返回JSON對象的暱稱）：

def listUsers(request, thread_id): 
    if not request.user.is_authenticated(): 
     return HttpResponseRedirect('/login/') 
    else:  
     thread_user_list = UserProfile.objects.filter(user=UsersThreads.objects.filter(thread=thread_id).values('pk')) 
     data = serializers.serialize('json', thread_user_list, ensure_ascii=False, fields=('nickname')) 
     return HttpResponse(data) 

我想要做的就是發送線程用戶的JSON對象。

它肯定與過濾器有關，因爲我試着簡單地返回HttpResponse（「asdf」）並且工作。所以我猜這是加入和norel數據庫的問題。當我在sqlite數據庫上運行時，這段代碼已經工作了（也許在調試時過濾功能有點改變）。

這裏是我的模型：

class UserProfile(models.Model): 
    nickname = models.CharField(max_length=25) 
    user = models.ForeignKey(User, unique=True) 
    facebook_id = models.CharField(max_length=200) 
    def __unicode__(self): 
    return self.nickname 

class Thread(models.Model): 
    name = models.CharField(max_length=200) 
    tagline = models.CharField(max_length=200) 
    founder = models.ForeignKey(UserProfile) 
    pub_date = models.DateTimeField('date published') 
    def __unicode__(self): 
     return self.name 

class UsersThreads(models.Model): 
    thread = models.ForeignKey(Thread) 
    user = models.ForeignKey(UserProfile) 
    def __unicode__(self): 
     return self.thread.name 

我創建UsersThreads，因爲我試圖避免谷歌的應用程序內發動機不會讓你做連接。我對django_norel的需求感到困惑。

這裏的蟒蛇錯誤代碼：如果

Environment: 


Request Method: GET 
Request URL: http://localhost:8000/users/4/ 

Django Version: 1.3 
Python Version: 2.5.1 
Installed Applications: 
['django.contrib.auth', 
'django.contrib.contenttypes', 
'django.contrib.sessions', 
'django.contrib.sites', 
'django.contrib.messages', 
'django.contrib.admin', 
'djangotoolbox', 
'dbindexer', 
'djangoappengine'] 
Installed Middleware: 
('dbindexer.middleware.DBIndexerMiddleware', 
'django.middleware.common.CommonMiddleware', 
'django.contrib.sessions.middleware.SessionMiddleware', 
'django.middleware.csrf.CsrfViewMiddleware', 
'django.middleware.csrf.CsrfResponseMiddleware', 
'django.contrib.auth.middleware.AuthenticationMiddleware', 
'django.contrib.messages.middleware.MessageMiddleware') 


Traceback: 
File "/Users/asdf/threadchat_main/django/core/handlers/base.py" in get_response 
    111.response = callback(request, *callback_args, **callback_kwargs) 
File "/Users/asdf/threadchat_main/threadchat/views.py" in listUsers 
    162.   data = serializers.serialize('json', thread_user_list, ensure_ascii=False, fields=('nickname')) 
File "/Users/asdf/threadchat_main/django/core/serializers/__init__.py" in serialize 
    91.  s.serialize(queryset, **options) 
File "/Users/asdf/threadchat_main/django/core/serializers/base.py" in serialize 
    39.   for obj in queryset: 
File "/Users/asdf/threadchat_main/django/db/models/query.py" in _result_iter 
    107.     self._fill_cache() 
File "/Users/asdf/threadchat_main/django/db/models/query.py" in _fill_cache 
    774.      self._result_cache.append(self._iter.next()) 
File "/Users/asdf/threadchat_main/django/db/models/query.py" in iterator 
    275.   for row in compiler.results_iter(): 
File "/Users/asdf/threadchat_main/djangotoolbox/db/basecompiler.py" in results_iter 
    219.   for entity in self.build_query(fields).fetch(low_mark, high_mark): 
File "/Users/asdf/threadchat_main/djangotoolbox/db/basecompiler.py" in build_query 
    278.   query.add_filters(self.query.where) 
File "/Users/asdf/threadchat_main/djangotoolbox/db/basecompiler.py" in add_filters 
    73.     self.add_filters(child) 
File "/Users/asdf/threadchat_main/djangotoolbox/db/basecompiler.py" in add_filters 
    76.    column, lookup_type, db_type, value = self._decode_child(child) 
File "/Users/asdf/threadchat_main/djangotoolbox/db/basecompiler.py" in _decode_child 
    87.   packed, value = constraint.process(lookup_type, value, self.connection) 
File "/Users/asdf/threadchat_main/django/db/models/sql/where.py" in process 
    329.      connection=connection, prepared=True) 
File "/Users/asdf/threadchat_main/django/db/models/fields/subclassing.py" in inner 
    53.    return func(*args, **kwargs) 
File "/Users/asdf/threadchat_main/django/db/models/fields/related.py" in get_db_prep_lookup 
    156.     sql, params = value._as_sql(connection=connection) 
File "/Users/asdf/threadchat_main/django/db/models/query.py" in _as_sql 
    941.    return obj.query.get_compiler(connection=connection).as_nested_sql() 
File "/Users/asdf/threadchat_main/django/db/models/sql/compiler.py" in as_nested_sql 
    136.   return obj.get_compiler(connection=self.connection).as_sql() 
File "/Users/asdf/threadchat_main/django/db/models/sql/compiler.py" in as_sql 
    68.   where, w_params = self.query.where.as_sql(qn=qn, connection=self.connection) 
File "/Users/asdf/threadchat_main/django/db/models/sql/where.py" in as_sql 
    92.      sql, params = child.as_sql(qn=qn, connection=connection) 
File "/Users/asdf/threadchat_main/django/db/models/sql/where.py" in as_sql 
    95.      sql, params = self.make_atom(child, qn, connection) 
File "/Users/asdf/threadchat_main/django/db/models/sql/where.py" in make_atom 
    171.   if lookup_type in connection.operators: 
File "/Users/asdf/threadchat_main/dbindexer/base.py" in __getattr__ 
    9.   return getattr(self._target, name) 
File "/Users/asdf/threadchat_main/django/utils/_threading_local.py" in __getattribute__ 
    183.    return object.__getattribute__(self, name) 

Exception Type: AttributeError at /users/4/ 
Exception Value: 'DatabaseWrapper' object has no attribute 'operators' 

Answer 1

不知道這是你的安裝。當我嘗試進行django-nonrel「加入」時，我遇到了同樣的問題。也許你可以先簡化thread_user_list的代碼，首先獲取主鍵並確認你的請求是正確的。