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Configurations

• Configurations files structure and navigating them: Github guide
• Generally:

config/
├── config.exs
├── dev.exs
├── prod.exs
└── test.exs

Logging

• Print to screen: SO answer

require Logger
Logger.debug "This is a debug line."

• Print variable content

inspect(a)

• Print type and useful info to screen: SO answer

i some_variable

i is defined as a protocol, it's implementation was useful

Logging Notes

• Following will work as long as struct_variable isn't a structure

Logger.debug non_struct_variable

Struct variables will produce the following error protocol String.Chars not implemented for, avoid that by using

Logger.debug inspect(struct_variable)

Debugging

• Debug elixir code using:

require IEx
IEx.pry

A useful Debug guide for elixir: Blog article

• Debugging Phoenix is a bit tricky, we need to execute phoenix itself From inside an interactive shell ie:

iex -S mix phoenix.server

Ref. blog article