Creating a Node in Django ORM

[Nafiul Islam]

How would you create a node using Django's ORM. This is what I mean: https://dpaste.de/JG52c/

Now, what I am basically trying to create is a liked list with nodes here.

[Elliot Bradbury]

Check out django-mptt for creating parent/child (tree) relationships between models. https://github.com/django-mptt/django-mptt

On Tue, Jul 9, 2013 at 9:07 AM, Nafiul Islam <gamesb...@gmail.com> wrote:

How would you create a node using Django's ORM. This is what I mean: https://dpaste.de/JG52c/

Now, what I am basically trying to create is a liked list with nodes here.

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[Gamesbrainiac]

Thanks for answering, but is there a simple way that does not use a third-party library? I'd like to have as much control over this as possible.

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Kind Regards,

Quazi Nafiul Islam

[John]

Nafiul,

From your code snippet, it looks like you are trying to create a tree.
Look at django-mptt or google "django tree" for more information.

If you are trying to do a linked list, with 'previous' and 'next'
pointers, they just need to go in as foreign keys, but see
https://docs.djangoproject.com/en/1.5/ref/models/fields/#django.db.models.ForeignKey.related_name
because you will need to use the related_name attribute to make the
foreign key relationships distinct from each other. You will also need a
List object that holds the head (and perhaps tail) pointers for the list.

John

[John]

Nafiul,

Either dig into the django-mptt code and pull out the bits you need, or look at MPTT and roll your own. http://www.sitepoint.com/hierarchical-data-database-2/ has a reasonable explanation (with code written in some archaic script ;) ) of how MPTT works.

John