Re: How to use primary key as an attribute

You are really are a life saver. Thank you so much sir. I have posted a more specific question. Please kindly have a look at it.

Thank you.

On Sun, Dec 1, 2013 at 5:09 PM, Timothy W. Cook <tim@mlhim.org> wrote:

If I understand what you are building.  You want some way to group
messages into threads? I assume that a Thread will have many messages?
 Unless I am missing something you might want something like this:

class Thread(models.Model):
    subject = models.CharField(max_length=256)

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

Then you can create a filter for the Thread based on a subject:

selected_subject = Thread.objects.filter(subject="some subject")

Then when you create the message you can use thread =
selected_subject[0] (assuming unique subjects/threads) when you create
your message. OR if 'some subject' isn't found,  len(selected_subject)
== 0 then create a new Thread.

HTH,
Tim

On Sun, Dec 1, 2013 at 8:30 AM, Aamu Padi <aamupadi@gmail.com> wrote:
> Actually I need to use Thread class in other class as a ForeignKey. Here is
> the whole code:
>
> class Thread(models.Model):
>     thread_pk = models.PositiveIntegerField(default=self.pk)
>
> 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)
>
>
> Is there anyway to create a new message without manually creating a Thread.
> I mean to auto-populate the Thread, whenever I create a new Message?
>

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