Flask Demo Project (OKC Python)

Demo project showing a few stages of development of a basic Flask application. This is the repo for the Flask: Introduction & Project Structure talk I gave April 10, 2019 (You can watch it Here). Each branch presents another step in the progression of the app:

Branches
01-basics	Presents the most basic form of a Flask application
02-templates	Static website with styling showcasing Flasks templating engine (Jinja2)
03-api	Combination app (Website/API) tied to a single-table postgres DB
04-blueprints	Optimized app using Flask's Blueprints feature (Ideal for scaling apps/APIs)

Please feel free to fork/clone this repo and play with it!

Before You Start

This app was built to try and isolate specific stages in the development stream. In doing so, I had to make a few adjustments that are not advised in your local environment. They are:

• The .gitignore file contains some files you will definitely want to exclude from version control. These were commented out to prevent them from being visable across all branches.
• 2 separate databases were used for these demos.
  • okc_python_demo was used for the 3rd branch
  • test was used for the final branch & master
  • I did this because the first example used only a single table while the second expanded to two... using the same DB would have broken one of them

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Instructions - Branches: master 04-blueprints

• For branches 01-basics and 02-templates all you need is the virtualenv and pip install flask
• For branch 03-api you will either need a new database called okc_python_demo (to utilize all of the sections) or just change the SQLALCHEMY_DATABASE_URI in the instance/dev.cfg file to direct to the test database described below.

First clone the repo and initialize a virtualenv:

$ git clone https://github.com/BrickBeard/flask_demo.git
$ cd flask_demo
$ virtualenv env
$ source env/bin/activate
(env)$ pip install -r requirements.txt

Next, make sure you have Postgres installed and then:

• create a database called test

  • $ createdb test
    

• create a postgres user test with password test

  • $ createuser test --pwprompt
    $ Enter password for new role:
    $ Enter it again:
    

• grant user privileges to that database

  • $ psql
    postgres=#   GRANT ALL PRIVILEGES ON DATABASE test TO test; 
    

Create Tables and Run App!

flask db migrate
flask db upgrade

flask run

Before navigating to the API page:

• Create a company first (users > companies > )
• add a user (users > )

...The API page runs a query to get the first user id from the database before rendering the html.

**Don't Forget to uncomment the files in .gitignore!!!**

Questions or Comments

Please leave feedback on here or reach out to me on the Techlahoma Slack @brickbeard