message_set filter

Hello,

I have a model for messaging between the users.

models.py:

class Message(models.Model):      description = models.TextField()      date_added = models.DateTimeField(default=datetime.now)      sender = models.ForeignKey(User, related_name='sent_set')      recipient = models.ForeignKey(User, related_name='recieved_set')        def __unicode__(self):          return "%s sent message: %s to %s" % (self.sender, self.description, self.recipient)        def save(self, **kwargs):          if self.sender == self.recipient:              raise ValueError("Cannot message yourself")          super(Message, self).save(**kwargs)

Till now I get all the messages (sent/recieved) of a particular user,

from django.db.models import Q
  
A = request.user  msg = Message.objects.filter(Q(sender=A)|Q(recipient=A))

Suppose, msg has all the messages sent and recieved for user 'A'. Now how would i filter from this 'msg',  all the message sent to and recieved from a particular user 'B'.

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