Django models design for ride share application

I am working on a ride share application. I need help on designing the models for private messages.

I have designed the below models, its look like complex in querying them in views. can you guys help me in design a better and easy one!

  class Ride(models.Model):         type = models.BooleanField(default=False)      add_source = models.ForeignKey(Address, related_name='source')      add_destination = models.ForeignKey(Address, related_name='destination')      ride_startDateTime = models.DateTimeField(default= datetime.datetime.now, blank=True)      ride_startPref = models.CharField(max_length=10, choices=CHOICES, default='None')    class Conversation(models.Model):      ride_id = models.ForeignKey(Ride)    class Messages(models.Model):      conversation_id = models.ForeignKey(Conversation)      ride_id = models.ForeignKey(Ride)      sender_id = models.ForeignKey(User, related_name='sender')      receiver_id = models.ForeignKey(User, related_name='receiver')      Content = models.TextField(max_length=1000,blank=True)      timestamp = models.DateTimeField(default= datetime.datetime.now, blank=True)      status = models.CharField(max_length=10,blank=True)

User model is django inbuilt. Please consider the following use cases:

1) A Conversation has to integrate with Ride, For Ex: User X is a owner of ride 3, User Y can contact X for this ride(3), then the new conversation id(77) will be generated. After that whatever messages sent between them should be under the same conversation id(77). If another user Z is trying to contact the user X for the same ride 3, then a new conversation ID(33) has to generated.

2) If the user X having another ride called 4, then if user Y contact the User X through the other ride means, it has to generate new conversation id(99) and all the messages sent between them on the ride should come under the same conversation id(99).

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With regards,

Kannan. R. P,
Blog @: http://kannan4k.wordpress.com/

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