Django的 - 查询

Question

我要检查所有Message的MessageState每个Threads（即order_threads_message）对象的列表和它们的对象字段，如果任何线程具有隐藏，则所有的消息作出这样的主题为隐藏太（/或将其从order_threads_message中删除）。我想在视图中将其传递给模板之前执行此操作。我怎么做？如果你没有找到我，请询问。我会很乐意解释。请帮助我如何在意见中做到这一点。我会很感激。谢谢。

models.py：

class Thread(models.Model): 
    subject = models.CharField(max_length=50, blank=True, null=True) 
    user = models.ManyToManyField(User) 

class ThreadState(models.Model): 
    thread = models.ForeignKey(Thread) 
    user = models.ForeignKey(User) 
    thread_hidden = models.BooleanField(default=False) 

class Message(models.Model): 
    thread = models.ForeignKey(Thread) 
    sender = models.ForeignKey(User) 
    sent_date = models.DateTimeField(default=datetime.now) 
    body = models.TextField() 

class MessageState(models.Model): 
    message = models.ForeignKey(Message) 
    user = models.ForeignKey(User) 
    read = models.BooleanField(default=False) 
    message_hidden = models.BooleanField(default=False) 

views.py

@login_required 
def message(request): 
    user = request.user 
    threads = user.thread_set.all() 
    order_threads_message = threads.annotate(max_sent_date=Max('message__sent_date')).order_by('-max_sent_date') 
    if order_threads_message.count() > 0: 
     recent_thread = order_threads_message[0] 
     if recent_thread.message_set.all().count() > 0: 
      recent_thread_conversations = recent_thread.message_set.all() 
      return render(request, 'conversations.html', { 
       'all_threads':order_threads_message, 
       'conversations':recent_thread_conversations, 
       'active': recent_thread.id 
       }) 
     else: 
      recent_thread_conversations = 0 
      return render(request, 'conversations.html', { 
       'all_threads':order_threads_message, 
       'conversations':recent_thread_conversations, 
       'active': recent_thread.id 
       }) 
    else: 
     order_threads_message = 0 
     recent_thread_conversations = 0 
     return render(request, 'conversations.html', { 
      'all_threads':order_threads_message, 
      'conversations':recent_thread_conversations, 
      }) 

Answer 1

我已经跑这个查询以下型号：

模式

class Thread(models.Model): 
    subject = models.CharField(max_length=50, blank=True, null=True) 
    user = models.ManyToManyField(User) 

class ThreadState(models.Model): 
    thread = models.ForeignKey(Thread) 
    user = models.ForeignKey(User) 
    thread_hidden = models.BooleanField(default=False) 

class Message(models.Model): 
    thread = models.ForeignKey(Thread, related_name = 'message_thread') 
    sender = models.ForeignKey(User) 
    sent_date = models.DateTimeField(default=datetime.now) 
    body = models.TextField() 

class MessageState(models.Model): 
    message = models.ForeignKey(Message, related_name='messagestate_message') 
    user = models.ForeignKey(User) 
    read = models.BooleanField(default=False) 
    message_hidden = models.BooleanField(default=False) 

查询

Thread.objects.filter(message_thread__in = Message.objects.filter(messagestate_message__in=MessageState.objects.filter(message_hidden=False))) 

如果MessageState的message_hidden的ATLEAST一个是False此查询将返回Thread对象。