Django-mptt order

Question

In my project I am using django-mptt for categories.

My model:

class Category(models.model):
    name = models.CharField()
    parent = models.ForeignKey         


        

Answer 1

When defining the model you can specify the ordering with "order_insertion_by".

So something like this:

class Category(MPTTModel):
    name = models.CharField()
    parent = models.ForeignKey("self", blank=True, null=True, 
             related_name="sub_category")

    class MPTTMeta:
        order_insertion_by = ['name']

Then you can rebuild your database with Category.tree.rebuild() which should respect the ordering specified.

Answer 2

With recent mptt versions (e.g. 0.8.7) you should use the TreeForeignKey field:

from mptt.models import MPTTModel
from mptt.fields import TreeForeignkey

class Category(MPTTModel):
    name = models.CharField()
    parent = TreeForeignKey("self", 
                           blank=True, 
                           null=True, 
                           related_name="sub_category")

    class MPTTMeta:
        order_insertion_by = ['name']