python-flask-api [ECHAVEZ]

.gitignore

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+.venv

app.py

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+from flask import Flask
+from flask_restful import Api
+from models import db
+from controller import LibraryListResource, LibraryResource
+
+app = Flask(__name__)
+api = Api(app)
+
+app.config['SQLALCHEMY_DATABASE_URI'] = 'sqlite:///library.db'
+app.config['SQLALCHEMY_TRACK_MODIFICATIONS'] = False
+
+db.init_app(app)
+
+@app.before_request
+def create_tables():
+    db.create_all()
+
+
+api.add_resource(LibraryResource, '/api/library/<string:isbn>')
+api.add_resource(LibraryListResource, '/api/library')
+
+if __name__ == '__main__':
+    app.run(debug=True)

controller/__init__.py

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+from .library_controller import LibraryListResource, LibraryResource

controller/library_controller.py

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+from flask_restful import Resource
+from flask import request
+from service import LibraryService
+from models import db
+
+class LibraryListResource(Resource):
+    def get(self):
+        books = LibraryService.get_all()
+        return [book.to_dict() for book in books], 200
+
+    def post(self):
+        try:
+            data = request.get_json()
+
+            if not data or 'isbn' not in data or 'title' not in data or 'author' not in data:
+                return {'message': 'Invalid data'}, 400
+
+            book = LibraryService.create(data)
+            return book.to_dict(), 201
+        except Exception as e:
+            db.session.rollback()
+            return {"error": "Unexpected error occured", "details":str(e)}, 500
+
+class LibraryResource(Resource):
+    def get(self, isbn):
+        book = LibraryService.get_by_id(isbn)
+        if not book:
+            return {'message': 'Book not found'}, 404
+        return book.to_dict(), 200
+
+    def put(self, isbn):
+        try:
+            data = request.get_json()
+            book = LibraryService.update(isbn, data)
+            if not book:
+                return {'message': 'Book not found'}, 404
+            return book.to_dict(), 200
+        except Exception as e:
+            db.session.rollback()
+            return {"error": "Unexpected error occured", "details":str(e)}, 500
+
+    def delete(self, isbn):
+        try:
+            book = LibraryService.delete(isbn)
+            if not book:
+                return {'message': 'Book not found'}, 404
+            return {"message": f"BOOK with ISBN {isbn} deleted"}, 200
+        except Exception as e:
+            db.session.rollback()
+            return {"error": "Unexpected error occured", "details":str(e)}, 500

models/__init__.py

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+from flask_sqlalchemy import SQLAlchemy
+db = SQLAlchemy()
+from .library import Library

models/library.py

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+from . import db
+
+class Library(db.Model):
+    __tablename__ = 'libraries'
+    isbn = db.Column(db.String(13), primary_key=True)
+    title = db.Column(db.String(80), nullable=False)
+    author = db.Column(db.String(80), nullable=False)
+
+    def to_dict(self):
+        return {
+            'isbn': self.isbn,
+            'title': self.title,
+            'author': self.author
+        }   

repositories/__init__.py

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+from .library_repository import LibraryRepository

repositories/library_repository.py

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+from models import db, Library
+
+class LibraryRepository:
+    @staticmethod
+    def find_all():
+        return Library.query.all()
+
+    @staticmethod
+    def find_by_id(isbn):
+        return Library.query.get(isbn)
+
+    @staticmethod
+    def save(book):
+        db.session.add(book)
+        db.session.commit()
+        return book
+    @staticmethod
+    def update(isbn, data: dict):
+        book = Library.query.get(isbn)
+        if not book:
+            return None
+
+        for key, value in data.items():
+            if hasattr(book, key):
+                setattr(book, key, value)
+
+        db.session.commit()
+        return book
+
+    @staticmethod
+    def delete(isbn):
+        book = Library.query.get(isbn)
+        if not book:
+            return None
+
+        db.session.delete(book)
+        db.session.commit()
+        return book

service/__init__.py

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+from .library_service import LibraryService

service/library_service.py

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+from repositories import LibraryRepository
+from models import Library
+
+class LibraryService:
+    @staticmethod
+    def get_all():
+        return LibraryRepository.find_all()
+
+    @staticmethod
+    def get_by_id(isbn):
+        return LibraryRepository.find_by_id(isbn)
+
+    @staticmethod
+    def create(data):
+        book = Library(
+            isbn=data['isbn'],
+            title=data['title'],
+            author=data['author']
+        )
+        return LibraryRepository.save(book)
+
+    @staticmethod
+    def update(isbn, data):
+        return LibraryRepository.update(isbn, data)
+
+    @staticmethod
+    def delete(isbn):
+        return LibraryRepository.delete(isbn)
+