How do I check whether there is a *thread* containing only the *sender
*(user 1) and the
*recipient* (user 2), and no other users.
models.py
class Thread(models.Model):
user = models.ManyToManyField(User)
is_hidden = models.ManyToManyField(User,
related_name='hidden_thread', blank=True)
class Message(models.Model):
thread = models.ForeignKey(Thread)
sent_date = models.DateTimeField(default=datetime.now)
sender = models.ForeignKey(User)
body = models.TextField()
is_hidden = models.ManyToManyField(User,
related_name='hidden_message', blank=True)
I tried
>>> Thread.objects.filter(user=user1&user2)
>>> Thread.objects.filter(user=user1|user2)
* # Both gave me an error: Unsupported operand.*
* # Then this*
>>> Thread.objects.filter(Q(user=user1) | Q(user=user2))
* # Which gave me all the threads of user1 and user2*
* # Then this*
>>> Thread.objects.filter(Q(user=user1) | Q(user=user2)).distinct()
* # Just the same as the above, just without repeating the same threads.*
What I want is to check the thread, with the specified users only. Suppose,
User 1 wants to send a message to User 2. First it must check whether there
is a thread between both the users. If there is, get that thread, or else
create a new one. How is it possible? Please help me. Thank you.
And please tell me what's the difference between `|` and `&`? Because I had
very different results with these two.
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