问题
Imagine that I have an mptt tree of objects and their population like:
Animal, 60
- aardvark, 30
- bobcat, 20
- chipmunk, 10
Vegetable, 6
- apple, 1
- beet, 2
- cauliflower, 3
Mineral 0
How would you sort the above by population on each sublevel? I want to get to:
Animal, 60
- aardvark, 30
- bobcat, 20
- chipmunk, 10
Vegetable, 6
- cauliflower, 3
- beet, 2
- apple, 1
Mineral 0
I am building off of mptt in django.
回答1:
I've just solved a similar issue. You can use an order_by, but not simply by the field you want to sort by:
MyModel.tree.all().order_by('tree_id', 'level', 'your_sort_field')
回答2:
Try to add it in the models.py Meta Class.
Or on a subsidiary QuerySet
回答3:
Should an order_by simply work?
YourModel.tree.filter(your=stuff).order_by('order')
来源：https://stackoverflow.com/questions/870821/how-would-you-sort-a-django-mptt-tree