Project start instructions

Using Nix or NixOS

0. Install Nix if not on NixOs:
   curl https://nixos.org/nix/install | sh

1. Clone project and cd into it

2. git clone https://github.com/NixOS/nixpkgs.git ~/clones/nixpkgs

3. Issue nix-shell

   Read shell.nix and/or the shell.nixes README to see what nix-shell will do.

4. Start Phoenix endpoint with mix phx.server or iex -S mix phx.server

Otherwise

• Install dependencies with mix deps.get
• Create and migrate your database with mix ecto.setup
• Install Node.js dependencies with cd assets && npm install
• Start Phoenix endpoint with mix phx.server

Now you can visit localhost:4000 from your browser.

Notes and TODOs

TODO 2019_09_08-2216 Make persistence immutable

For example, if a user is deleted, there will be many dangling pointers; one example is an Assessment where AssessmentEvent holds logs on who created it, how user assigments changed and so on. Assessments mustn't be deleted when a user is gone (e.g., :on_delete).

Couple possibilities:

• make table immutable

• make it impossible to update/delete data from API and front-ends (should probably use it in conjunction with the previous option)

• use Event Sourcing (with CQRS probably?)