WTOAAM/wtoaamapi/apps/models.py

from django.db import models

# Create your models here.

class Category(models.Model):
    name = models.CharField(max_length=100)

class Product(models.Model):
    name = models.CharField(max_length=100)
    category = models.ForeignKey(Category, related_name='products', on_delete=models.CASCADE)