django-treebeard

from django.db import models from treebeard.mp_tree import MP_Node # Define a simple tree model inheriting from MP_Node (Materialized Path) # This is generally the recommended tree type for most use cases. class Category(MP_Node): name = models.CharField(max_length=255) # Crucial for deterministic ordering of siblings node_order_by = ['name'] class Meta: verbose_name_plural = 'categories' def __str__(self): return self.name # Example usage (e.g., in a Django shell or view): # Create root nodes # root1 = Category.add_root(name='Electronics') # root2 = Category.add_root(name='Books') # Add children to root1 # phone = root1.add_child(name='Phones') # laptop = root1.add_child(name='Laptops') # Add a grandchild to phone # iphone = phone.add_child(name='iPhones') # Retrieve and traverse # for node in Category.get_tree(): # print(f"{'--' * node.depth} {node.name}")