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def validate_menu_categories(value): required_catogories = ["Appetizers", "Main Course", "Desserts"] for c in required_catogories: if c.lower() not in value.lower(): raise ValidationError(message "The menu must include each of the categories "Appetizers", "Main Course", "Desserts".") class Menu(models.Model): name = models.CharField(max_length=100) description = models.TextField(validators=[validate_menu_categories]) restaurant = models.ForeignKey("Restaurant", on_delete=models.CASCADE)
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