Django沒有對象匹配給定的查詢，但它應該

Question

我有以下問題我的數據庫不是空的，並有我需要的記錄。但是，當我查詢分貝它說，沒有這樣的對象匹配給定的查詢。我使用Django通道從websocket查詢數據庫，我的數據庫是postgreSQL。

我知道有這個別人的質疑，我看着他們，但他們都對空數據庫或錯誤的URL蛞蝓這是不是我的情況，不知道他是誰

這裏是對應的代碼：

@channel_session_user_from_http 
def ws_receive(message): 
    username = message.user.username 
    print(username) 
    text = json.loads(message['text']).get('text') 
    # Use my algorithm here 
    score = score_argument.get_rating(text) 
    # find the room with our users 

    current_room = get_object_or_404(PairUsers, Q(username_a=username) | Q(username_b=username)) 

    # current_room = PairUsers.objects.filter(Q(username_a=username) | Q(username_b=username)).first() 

    # check which user you got and send the message to the other 
    if current_room.username_b == username: 
     current_room.score_b = score 
     other_channel = Channel(current_room.reply_channel_a) 
     message.reply_channel.send({'text': text}) 
     other_channel.send({'text': text}) 
    else: 
     current_room.score_a = score 
     other_channel = Channel(current_room.reply_channel_b) 
     message.reply_channel.send({'text': text}) 
     other_channel.send({'text': text}) 

，我注意到另一件事是，打印（用戶名）不打印任何東西它只是跳過這一行。我用message.user.username不同功能的作品，所以我敢肯定它應該返回用戶名

回溯：

Traceback (most recent call last): 
    File "C:\Program Files (x86)\Python35\lib\site-packages\channels\worker.py", line 119, in run 
    consumer(message, **kwargs) 
    File "C:\Program Files (x86)\Python35\lib\site-packages\channels\sessions.py", line 180, in inner 
    result = func(message, *args, **kwargs) 
    File "C:\Program Files (x86)\Python35\lib\site-packages\channels\auth.py", line 73, in inner 
    return func(message, *args, **kwargs) 
    File "C:\Program Files (x86)\Python35\lib\site-packages\channels\sessions.py", line 64, in inner 
    return func(message, *args, **kwargs) 
    File "C:\Program Files (x86)\Python35\lib\site-packages\channels\auth.py", line 89, in inner 
    return func(message, *args, **kwargs) 
    File "C:\Users\nithe\Desktop\debateit\play\consumers.py", line 51, in ws_receive 
    current_room = get_object_or_404(PairUsers, Q(username_a=username) | Q(username_b=username)) 
    File "C:\Program Files (x86)\Python35\lib\site-packages\django\shortcuts.py", line 93, in get_object_or_404 
    raise Http404('No %s matches the given query.' % queryset.model._meta.object_name) 
django.http.response.Http404: No PairUsers matches the given query. 

Answer 1

message.user.username似乎None，當然您的查詢就會失敗。這個問題不是數據庫問題（還沒有），它與channels有關。
嘗試打印您的message.user.__dict__，看它是否與您期望的對象相符。