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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)

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Damien De Paoli
2020-11-03 18:29:41 +11:00
commit a51db7c9e4
9 changed files with 126 additions and 0 deletions
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README Normal file
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## TODO: get all this inside a docker container and use compose to do the whole set (pg, flask, ?)
# flash -> python web server
# sqlalchemy -> provides db-agnostic python objects of db content (and more)
## LEARN: not totally sure what flask-sqlachemy provides
# --user sticks python libs in ~/.local/[bin|lib|share]
##LEARN: supposedly could use virtualenv instead?
sudo apt install python3-psycopg2 libpq-dev
pip3 install --user flask sqlalchemy flask-sqlalchemy
# run the web server by:
python3 book.py

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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)

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<html>
<body>
<h1>authors</h1>
{% for author in authors %}
<p>{{author.surname}}, {{author.firstnames}}</p>
{% endfor %}
</body>
</html>

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<html>
<head>
<!-- Required meta tags -->
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1, shrink-to-fit=no">
<!-- Bootstrap CSS -->
<link rel="stylesheet" href="https://cdn.jsdelivr.net/npm/bootstrap@4.5.3/dist/css/bootstrap.min.css" integrity="sha384-TX8t27EcRE3e/ihU7zmQxVncDAy5uIKz4rEkgIXeMed4M0jlfIDPvg6uqKI2xXr2" crossorigin="anonymous">
<link rel="stylesheet" href="https://unpkg.com/bootstrap-table@1.18.0/dist/bootstrap-table.min.css">
<link rel="stylesheet" href="https://cdn.datatables.net/1.10.22/css/dataTables.bootstrap4.min.css">
</head>
<body>
<form method="POST" action="/">
<input type="text" name="title">
<input type="submit" value="Add">
</form>
<h3>All Books</h1>
{% if books is iterable %}
<table id="book_table" class="table table-striped table-sm" data-toolbar="#toolbar" data-search="true">
<thead>
<tr class="thead-light"><th>Title</th><th>Author</th></tr>
</thead>
<tbody>
<script src="https://code.jquery.com/jquery-3.5.1.slim.min.js" integrity="sha384-DfXdz2htPH0lsSSs5nCTpuj/zy4C+OGpamoFVy38MVBnE+IbbVYUew+OrCXaRkfj" crossorigin="anonymous"></script>
{% for book in books %}
<tr><td data-sort="{{book.id}}">{{book.title}}</td><td>{{ book.author[0]['surname'] }}, {{ book.author[0]['firstnames'] }}</td></tr>
{% endfor %}
</tbody>
</table>
{% else %}
<p>{{books.title}}, {{ books.author[0]['surname'] }}, {{books.author[0]['firstnames']}} </p>
{% endif %}
<script src="https://code.jquery.com/jquery-3.5.1.slim.min.js" integrity="sha384-DfXdz2htPH0lsSSs5nCTpuj/zy4C+OGpamoFVy38MVBnE+IbbVYUew+OrCXaRkfj" crossorigin="anonymous"></script>
<script src="https://cdn.jsdelivr.net/npm/bootstrap@4.5.3/dist/js/bootstrap.bundle.min.js" integrity="sha384-ho+j7jyWK8fNQe+A12Hb8AhRq26LrZ/JpcUGGOn+Y7RsweNrtN/tE3MoK7ZeZDyx" crossorigin="anonymous"></script>
<script src="https://cdn.datatables.net/1.10.22/js/jquery.dataTables.min.js"></script>
<script src="https://cdn.datatables.net/1.10.22/js/dataTables.bootstrap4.min.js"></script>
<script>
$(document).ready(function() {
$('#book_table').DataTable();
} );
</script>
</body>
</html>