Let's say we want to have product categories where each category can have multiple products, but each product should have only one category. Let's do this by modifying some files from the preceding application. We will make modifications to both models and views. In models, we will add a Category model, and, in views, we will add new methods to handle category-related calls and also modify the existing methods to accommodate the newly added feature.
First, modify the models.py file to add the Category model and make some modifications to the Product model:
from my_app import db class Product(db.Model): id = db.Column(db.Integer, primary_key=True) name = db.Column(db.String(255)) price = db.Column(db.Float) category_id = db.Column(db.Integer, ...
