How can I load a module into another module using Elixir language?

Question

I'm having hard time to load a module into another module using Elixir language.

For example, I have 2 files shown below:

a.ex

defmodule A do
  def a do
    IO.puts "A.a"
  end
end

b.ex

defmodule B do
  require A

  def b do
    IO.puts "B.b"
    A.a
  end
end

B.b

I tried to execute b.ex. Then I got error shown below:

$elixir b.ex
** (CompileError) b.ex:2: module A is not loaded and could not be found

there are 2 files in the same directory. a.ex and b.ex

Hideshi Ogoshi
– Hideshi Ogoshi

2015-12-06 07:14:37 +00:00
Commented Dec 6, 2015 at 7:14 — Hideshi Ogoshi
– Hideshi Ogoshi, Commented Dec 6, 2015 at 7:14

TheStoneFox · Accepted Answer · 2015-12-06 07:18:23Z

4

In your file b.ex remove the B.b from the last line

Then in your project directory run Iex like so

iex -S mix

This will load iex and load your modules correcly

Then you can just do B.b

and you'll see:

B.b
A.a
:ok

Also, make sure your a.ex and b.ex files are in the lib/ directory of your elixir project

edited Dec 6, 2015 at 7:18

answered Dec 6, 2015 at 7:14

TheStoneFox

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2 Comments

asymmetric Over a year ago

@HideshiOgoshi you should accept the answer if it worked

ANIL MANE Over a year ago

I tried running same code but unable to run. I ran "iex -S mix" in command prompt "G:\work\Project1>iex -S mix" where I have lib\ProjectName folder within G:\work\Project1. I get following iex(1)> B.b ** (UndefinedFunctionError) function B.b/0 is undefined (module B is not available) B.b()

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