Elixir Microapps

This repository is a collection of small elixir applications.

List of Projects:

1. To-Do List
2. Light Switch

General Dependencies

• Elixir V1.14
• Phoenix V1.6.14
• Phoenix Liveview
• PostgreSQL

Linux users must install the inotify-tools filesystem watcher with apt-get install inotify-tools

Notes

Setting up PostGreSQL

Phoenix assumes that our PostgreSQL database will have a postgres user account with the correct permissions and a password of postgres

In Conda

1. Install postgres: conda install -c anaconda postgresql

2. create local base db: initdb -D <basename>

3. start the db instance: pg_ctl -D <basename> -l logfile start

4. create non-superuser acc (for safety): createuser --encrypted --pwprompt <username>

5. create inner db within base: createdb --owner=<username> <innername>

6. connect app with inner db: see section below

7. To stop: us ps to find and kill root

psql commands (used with psql --username=<username>):

• -l: list all databases

• -\c <dbname>: connect/switch to a certain database

• -dt: list all tables in the current database using your search_path

• -dt *.: list all tables in the current database regardless your search_path

• dropdb <dbname>: delete db

In Linux

1. Update and install postgres then start the service

sudo apt update
sudo apt install postgresql postgresql-contrib
sudo systemctl start postgresql.service

1. Log in to psql. The 'postgres' role is created by default. Modify it to change its password to postgres

sudo -i -u postgres
psql
/password psql
/q

Setting up a new LiveView project

To install, run:

mix local.hex
mix archive.install hex phx_new

1. To create a new Phoenix application run mix phx.new <appname>

PostgreSQL is used by default. MySQL, MSSQL, or SQLite3 can be used by passing the --database flag when creating a new application. The --no-ecto flag can be used to disable ecto, the elixir package that talks to databases. 2. cd into project dir and run mix ecto.create to create db 3. Start server with mix phx.server 4. Generate and migrate the schema with mix phx.gen.context and mix ecto.migrate

Learning Resources

• Installing PostGreSQL with Anaconda
• Lifecycle of a Phoenix LiveView
• Light Switch with Phoenix LiveView
• To-Do List with Phoenix LiveView