This app is written in Python with Flask and SQLAlchemy, as a part of the Udacity's Full Stack Web Developer Nanodegree program.

In order to run this app, the following dependencies must have been already installed:

1. Postgres.

• Start manually: pg_ctl -D /usr/local/var/postgres start
• Stop manually: pg_ctl -D /usr/local/var/postgres stop -s -m fast

2. Flask

The database relations todos(id, description, complete, list_id) and todolists(id, name) must have been already created in Postgres. We have assumed that the Postgres is running on default port 5432.

• dropdb todoapp -p 5432 && createdb todoapp -p 5432
• Open the database prompt - psql -p 5432
• Connect to the database - \c todoapp
• Displays the tables in the database \dt
• Displays the schema of the 'todos' table \d todos
• Displays the schema of the 'todolists' table \d todolists

You can insert a few rows in both the tables. Insert first in the todolists relation.

First of all locate to app directory using: cd todoapp

• python3 -m venv env set the virtual environment for Pyhton
• source env/bin/activate activate the venv

• python -m pip install -r requirements.txt to install dependencies. For Mac users, if you face difficulty in installing the psycopg2, you may consider intalling the sudo brew install libpq before running the requirement.txt.

• flask db init to create the migrations directory structure
• dropdb todoapp if you already have it
• createdb todoapp
• flask db migrate (Detects the model changes to be made and creates a migration file with upgrade and downgrade logic setup.
• Using flask db uprade when you want to commit your changes to database
• Using flask db migrate when you want to rollback the changes.

• export FLASK_APP=app.py
• export FLASK_DEBUG=true
• Then flask run to run the app (http://127.0.0.1:5000/ or http://localhost:5000)
• deactivate de-activate the virtual environment