Config

Each application has its own environment.

config/config.exs is base of every project

config/dev.exs

import_config "dev.secret.exs"

config/dev.secrets.exs

use Mix.Config

config :sonar,
  google: "fasfdajkl"

Usage

Application.fetch_env!(:sonar, :google)
Application.get_env(:sonar, :google, :default) #allows default and no error if key doesn't exist

Based on env

  if Mix.env() == :dev do
    #... can even be in router
  end

Runtime.ex vs Prod.ex

Simply:

• releases.exs - runtime configuration for release only

• #{Mix.env()}.exs - i.e. dev.exs, prod.exs, test.exs - those are compiletime environment-specific configuration files

• config.exs - compiletime generic configuration file

• releases.exs - runtime generic configuration file