Python Microservices Development

View and Template

When a request is received, and a view is invoked, Flask-SQLAlchemy will set up a database session object inside an application context. The following is a fully functional Flask app that uses the schema described earlier in a View that can be queried from /users:

    from flask import Flask, render_template      app = Flask(__name__)      @app.route('/users')     def users():         users = db.session.query(User)         return render_template("users.html", users=users)      if __name__ == '__main__':         db.init_app(app)         db.create_all(app=app)         app.run() 

When the db.session.query() method is called, it performs a query on the database and turns every result from the User table into User objects that are passed to the users.html Jinja template for ...