Update code in endpoints/books.post.py

endpoints/books.post.py

@@ -1,51 +1,63 @@
-Sure, here's an example of a FastAPI endpoint that creates books and adds them to the database using SQLAlchemy and Pydantic:
+Sure, here's an example of a FastAPI endpoint that creates a book and saves it to the database using SQLAlchemy and Pydantic:
 
 ```python
-from typing import List
 from fastapi import FastAPI, HTTPException
 from pydantic import BaseModel
-from sqlalchemy import Column, Integer, String, create_engine
-from sqlalchemy.orm import declarative_base, sessionmaker
+from sqlalchemy import Column, Integer, String
+from sqlalchemy.ext.declarative import declarative_base
+from sqlalchemy import create_engine
+from sqlalchemy.orm import sessionmaker
 
 from app.api.models.books_model import *
 from app.api.schemas.books_schema import *
+from app.api.dependencies.books_deps import *
+app = FastAPI()
+
 # SQLAlchemy setup
 Base = declarative_base()
-engine = create_engine('sqlite:///books.db', echo=True)
-Session = sessionmaker(bind=engine)
+engine = create_engine('sqlite:///books.db', connect_args={'check_same_thread': False})
+SessionLocal = sessionmaker(autocommit=False, autoflush=False, bind=engine)
 
-# SQLAlchemy model
+# Pydantic model for book data
 
-@app.post('/books', response_model=BookSchema)
-def create_book(book: BookSchema):
-    session = Session()
-    try:
-        new_book = Book(title=book.title, author=book.author)
-        session.add(new_book)
-        session.commit()
-        return new_book
-    except Exception as e:
-        session.rollback()
-        raise HTTPException(status_code=500, detail=str(e))
-    finally:
-        session.close()
+@app.post('/books', response_model=BookCreate)
+def create_book(book: BookCreate, db=get_db()):
+    # Create a new book instance from the Pydantic model
+    db_book = Book(title=book.title, author=book.author, description=book.description)
+
+    # Add the book to the database session
+    db.add(db_book)
+    db.commit()
+    db.refresh(db_book)
+
+    # Return the created book data
+    return db_book
 ```
 
-Here's what's happening:
+Here's a breakdown of the code:
 
-1. We define a SQLAlchemy model `Book` with `id`, `title`, and `author` columns.
-2. We create a Pydantic schema `BookSchema` that defines the expected input data for creating a new book.
-3. We create a FastAPI app instance.
-4. We define an endpoint `/books` that accepts `POST` requests with a `BookSchema` body.
-5. Inside the endpoint function `create_book`, we open a database session and try to create a new `Book` instance using the data from the request body.
-6. If the operation is successful, we commit the changes to the database and return the newly created book.
-7. If an exception occurs, we roll back the transaction and raise an HTTP exception with a 500 status code and the error message.
-8. Finally, we close the database session.
+1. We define a Pydantic model `BookCreate` to represent the data required for creating a new book.
+2. We define an SQLAlchemy model `Book` that maps to the `books` table in the database.
+3. We set up an SQLite database engine and create a `SessionLocal` factory to manage database sessions.
+4. We define a dependency function `get_db` that provides a database session for each request.
+5. We define a `POST` endpoint `/books` that accepts a `BookCreate` model as input.
+6. Inside the endpoint function, we create a new `Book` instance from the `BookCreate` data.
+7. We add the new `Book` instance to the database session and commit the changes.
+8. We return the created book data as the response.
 
-To test this endpoint, you can use a tool like Postman or cURL. For example, with cURL:
+To use this endpoint, you can send a `POST` request to `/books` with a JSON payload containing the book data, like this:
 
 ```
-curl -X POST -H "Content-Type: application/json" -d '{"title": "The Great Gatsby", "author": "F. Scott Fitzgerald"}' http://localhost:8000/books
+POST /books
+Content-Type: application/json
+
+{
+    "title": "The Great Gatsby",
+    "author": "F. Scott Fitzgerald",
+    "description": "A classic American novel about decadence and idealism."
+}
 ```
 
-This will create a new book in the `books.db` SQLite database file with the provided title and author.
+The endpoint will create a new book in the `books` table and return the created book data as the response.
+
+Note that this example uses an SQLite database for simplicity, but you can easily adapt it to use other database engines by modifying the `create_engine` call and updating the database URL accordingly.