Nested modules and "@variable" access

Question

Say, I have 2 modules.

defmodule Mod1 do
  @var1 123
end


defmodule Mod1.Mod2 do
  def func1 do
    @var1 * 10 # how ????
  end
end

Is there any way to access @var1 without having to create a special function for it in Mod1?

defmodule Mod1 do
  @var1 123

  def var1_getter do    # only for Mod2
    @var1 123           # any other way???
  end
end

I advise to read more documentation and read carefully "Programming Elixir" before asking here. — PatNowak
– PatNowak, Commented Feb 9, 2017 at 12:26

Dogbert · Accepted Answer · 2017-02-09 09:09:24Z

4

Is there any way to access @var1 without having to create a special function for it in Mod1?

No, there isn't. Module attributes only exist at compile time and if you want to expose their values, you need to return it from a public function.

Also, there's nothing special about nested modules in Elixir except that the name of the parent module is a prefix of the name of its children. After compilation, they're completely separate modules that happened to be named Mod1 and Mod1.Mod2.

answered Feb 9, 2017 at 9:09

Dogbert

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3 Comments

Aleksei Matiushkin Over a year ago

It is worth mentioning that Kernel.@ is a plain old good macro that is basically a sophisticated-check-enabled alias for Module.put_attribute/3.

PatNowak Over a year ago

Elixir is far away from OOP, so nested modules are not nested classes and module attributes are far from class fields.

Ankanna Over a year ago

you can define a macro __USING__ and write all your attributes inside the macro and load them into your module like this use module_name

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