from django.db import models
from mptt.models import MPTTModel, TreeForeignKey
from mptt.managers import TreeManager

class Specialization(MPTTModel):
    name = models.CharField(max_length=100)
    parent = TreeForeignKey('self', null=True, blank=True, related_name='children', db_index=True)
    
    objects = TreeManager()
    
    def __str__(self):
        return self.name
    
    class MPTTMeta:
        order_insertion_by = ['name']