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lib/runtime_check.exs

defmodule RuntimeCheck do
# When running your application locally with iex -S mix or mix run,
# `config/config.exs` is evaluated every time the application starts.
use PersistConfig
@dummy_test2 get_env(:dummy_test2)
@speed_of_light :speed_of_light_in_meters_per_second
@persist_config_all_env get_all_env(@app)
# Confirms that `config/config.exs` is persisted at runtime.
# To run in iex: mix run -e 'RuntimeCheck.check_env'
def check_env do
# Persisted at compile-time...
IO.inspect(@dummy_test2, label: "@dummy_test2")
# Persisted at runtime...
get_env(@speed_of_light) |> IO.inspect(label: @speed_of_light)
get_env(:pi) |> IO.inspect(label: :pi)
# Not persisted at runtime...
get_env(:dummy_test2) |> IO.inspect(label: :dummy_test2)
end
# To run in iex: mix run -e 'RuntimeCheck.check_all_env'
def check_all_env do
get_all_env(@app) |> IO.inspect(label: :persist_config_all_env)
IO.inspect(@persist_config_all_env, label: "@persist_config_all_env")
end
end