auto populating the fields in the models

[Aamu Padi]

Hello, please have a look at my models.py.

models.py:

class Thread(models.Model):
    pass

class ThreadParticipant(models.Model):
    thread = models.ForeignKey(Thread)
    user = models.ForeignKey(User)

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

class MessageReadState(models.Model):
    message = models.ForeignKey(Message)
    user = models.ForeignKey(User)
    read_date = models.DateTimeField()

I am having two problems when I try to create a new message:

1. How do I auto populate the Thread with its primary key whenever I create a new message, without manually creating a new thread?
2. How to create a new user if the user is not in the the ThreadParticipant, or else don't create a new user?

I think I can solve this all in the views.py, but I think it will be better to solve this in the models.py. Please help me solve the problem. I would be very grateful. Thank you.

[Rafael E. Ferrero]

IMHO with this design you first need an user and a thread to create a new message.

In the admin interface you gonna look a + button to create a user and other to create a thread.

For example

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

    def save(self):
        if not self.id:

            #on a new message do something

        #on modify message do somenthing else

        super(Message, self).save()

2013/12/1 Aamu Padi <aamu...@gmail.com>

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Rafael E. Ferrero

[Rafael E. Ferrero]

sorry my previous message... it was not quite clear... here again:

2013/12/1 Rafael E. Ferrero <rafael....@gmail.com>

IMHO with this design you first need an user and a thread to create a new message.

In the admin interface you gonna look a + button to create a user and other to create a thread.

OR

You can redefine the save method of your model. For example:
 

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Rafael E. Ferrero

[Aamu Padi]

Yes, that's what I was looking for, the save method. Can you please kindly show me how, so that I don't have to create a new thread first or create a new set of ThreadParticipants. I just want it to be on the background, so that all I have to do is create a message and send it to the user.

Thank you.

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