Question

Here’s the logic for the models:

1. Category. There are several categories; each category can contain several products.
2. Product. There are several products; each product can only have one category.

Is it possible to specify what kind of category each product is within the model file itself? For example: can I set the model so that a shirt can only be clothing and nothing else?

Here’s what I have so far (it doesn’t validate):

class Category(models.Model):
   CATEGORY_CHOICES = (
        ('CLOTHING', 'Clothing'),
        ('FURNITURE', 'Furniture'),
   )
   category = models.CharField(choices=CATEGORY_CHOICES)


class Shirt(Product):
    category = models.ForeignKey(Category, default=CATEGORY_CHOICES.CLOTHING)

    class Table(Product):
       category = models.ForeignKey(Category, default=CATEGORY_CHOICES.FURNITURE)

I’m new at this. Thanks for the help!

Answer 1

You can validate your model on save with any arbitrary rules. So, write a validation rule that checks that all shirts are saved in the category clothing.

For user input, create a form that only provides choices corresponding to the product.

Good luck!