initial commit of book library in python with sqlalchemy (as an ORM), flask (for the web server) and jinja2 (as the web template front-end bit)

main.py

@@ -0,0 +1,60 @@
+from flask import Flask
+from flask import render_template
+from flask import request
+from flask_sqlalchemy import SQLAlchemy
+import logging
+
+DB_URL = 'postgresql+psycopg2://ddp:NWNlfa01@127.0.0.1:5432/library'
+app = Flask(__name__)
+app.config['SQLALCHEMY_DATABASE_URI'] = DB_URL
+app.config['SQLALCHEMY_TRACK_MODIFICATIONS'] = False
+db = SQLAlchemy(app)
+
+####################################### CLASSES / DB model #######################################
+book_author_link = db.Table('book_author_link', db.Model.metadata,
+    db.Column('book_id', db.Integer, db.ForeignKey('book.id')),
+    db.Column('author_id', db.Integer, db.ForeignKey('author.id'))
+)
+
+class Book(db.Model):
+    id = db.Column(db.Integer, unique=True, nullable=False, primary_key=True)
+    title = db.Column(db.String(100), unique=True, nullable=False)
+    author = db.relationship('Author', secondary=book_author_link)
+
+    def __repr__(self):
+        return "<title: {}, id: {} author: {} author.firstnames {}>".format(self.title, self.id, self.author, self.id )
+#        return "<title: {}, id: {} author: {} author.firstnames {}>".format(self.title, self.id, self.author, self.author.firstnames )
+
+class Author(db.Model):
+    id = db.Column(db.Integer, unique=True, nullable=False, primary_key=True)
+    firstnames = db.Column(db.String(50), unique=False, nullable=False)
+    surname = db.Column(db.String(30), unique=False, nullable=False)
+
+#    book = db.relationship('Book', secondary=book_author_link )
+
+    def __repr__(self):
+        return "<firstnames: {}, surname: {}>".format(self.firstnames, self.surname )
+#        return "<firstnames: {}, surname: {}, book: {}>".format(self.firstnames, self.surname, self.book)
+
+####################################### ROUTES #######################################
+@app.route("/books", methods=["GET"])
+def books():
+    if request.form:
+        print(request.form)
+    books = Book.query.all()
+    return render_template("books.html", books=books)
+
+@app.route("/book/<id>", methods=["GET"])
+def book(id):
+    book = Book.query.get(id)
+    print( book )
+    return render_template("books.html", books=book )
+
+@app.route("/authors", methods=["GET"])
+def author():
+    authors = Author.query.all()
+    return render_template("author.html", authors=authors)
+
+if __name__ == "__main__":
+    app.run(host="0.0.0.0", debug=True)
+