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from django.db import models class ReferredCategory(models.Model): name = models.CharField( max_length=100, unique=True, verbose_name="Category Name" ) class Meta: verbose_name = "Referred Category" verbose_name_plural = "Referred Categories" ordering = ['name'] def __str__(self): return self.name class ReferredSubCategory(models.Model): category = models.ForeignKey( ReferredCategory, on_delete=models.CASCADE, related_name='subcategories', verbose_name="Parent Category" ) name = models.CharField( max_length=100, verbose_name="Subcategory Name" ) class Meta: verbose_name = "Referred Subcategory" verbose_name_plural = "Referred Subcategories" constraints = [ models.UniqueConstraint( fields=['category', 'name'], name='unique_category_subcategory' ) ] ordering = ['category__name', 'name'] def __str__(self): return self.name