life cycle of a snapping turtle - Let’s build an **e-commerce API** using FastAPI. This project will include features like product management, user authentication, and database integration using **SQLAlchemy**. We're going to create a robust and scalable API for an online store. First, you'll need to install SQLAlchemy and a database driver (like `psycopg2` for PostgreSQL or `mysql-connector-python` for MySQL). Install these using `pip install sqlalchemy psycopg2-binary`. Create a new file named `models.py` and set up the database models. This file will define the structure of your data in the database. ```python from sqlalchemy import create_engine, Column, Integer, String, Boolean, ForeignKey from sqlalchemy.orm import sessionmaker, declarative_base from sqlalchemy.ext.declarative import declarative_base from sqlalchemy.orm import relationship ``` Create a database connection using SQLAlchemy. Replace the database URL with your actual database URL (e.g., PostgreSQL, MySQL). ```python DATABASE_URL = "postgresql://user:password@host:port/database_name" engine = create_engine(DATABASE_URL) SessionLocal = sessionmaker(autocommit=False, autoflush=False, bind=engine) Base = declarative_base() ``` Here, we establish the connection to the database and create a session class that will manage database transactions. Define the database models for products, users, and any other entities you need for your e-commerce API. ```python class User(Base): __tablename__ = "users" id = Column(Integer, primary_key=True, index=True) username = Column(String, unique=True, index=True) hashed_password = Column(String) is_active = Column(Boolean, default=True) products = relationship("Product", back_populates="owner") class Product(Base): __tablename__ = "products" id = Column(Integer, primary_key=True, index=True) name = Column(String, index=True) description = Column(String, index=True) price = Column(Integer) is_active = Column(Boolean, life cycle of a snapping turtle default=True) owner_id = Column(Integer, ForeignKey("users.id")) owner = relationship("User", back_populates="products") ``` These models define the schema for your database tables. Now, create a file named `main.py` and import the necessary modules. ```python from fastapi import FastAPI, Depends, HTTPException from sqlalchemy.orm import Session from .models import Base, User, Product, SessionLocal from .auth import create_access_token, get_current_user ``` Here, we import FastAPI, database models, and authentication-related functions. Initialize the FastAPI app and create the database tables if they don't exist. ```python app = FastAPI() Base.metadata.create_all(bind=engine) ``` Next, we create a function to get the database session. ```python def get_db(): db = SessionLocal() try: yield db finally: db.close() ``` This function creates a database session and ensures it's closed after use. Implement user registration and login endpoints, similar to the authentication API in Project 2, but integrate database operations. ```python @app.post("/register/") def register_user(user: UserCreate, db: Session = Depends(get_db)): # Register user logic here ``` Create endpoints to manage products, including creating, reading, updating, and deleting products. These endpoints will interact with the database. ```python @app.post("/products/") def create_product(product: ProductCreate, db: Session = Depends(get_db), current_user: User = Depends(get_current_user)): # Create product logic here ``` Implement any other features, such as creating categories or managing shopping carts. To run this project, you'll need a running database instance and the necessary configurations. With these steps, you’ll have a functioning e-commerce API that leverages **FastAPI**, **SQLAlchemy**, and database integration.
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