Get class name from a class nested in a module in ruby

Question

If I give you:

module Something
  module SomethingElse
    class Foo
    end
  end
end

How do you get the class name of "Foo"? In the console, I have something similar to the example, but when I do .name on it it doesn't print out what I expect.

This is whats in my console:

pry(main)> AisisWriter::Controllers::CommentsManagement::CommentsHandler.name
=> "AisisWriter::Controllers::CommentsManagement::CommentsHandler"

What I expect is just "CommentsHandler"

stackoverflow.com/a/24832287/438992

Dave Newton
– Dave Newton

2015-05-13 17:59:13 +00:00
Commented May 13, 2015 at 17:59 — Dave Newton
– Dave Newton, Commented May 13, 2015 at 17:59

Noman Ur Rehman · Accepted Answer · 2015-05-13 17:59:37Z

5

You can do:

AisisWriter::Controllers::CommentsManagement::CommentsHandler.name.split('::').last || ''

answered May 13, 2015 at 17:59

Noman Ur Rehman

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Comments

djaszczurowski · Accepted Answer · 2015-05-13 17:57:10Z

2

If you have ActiveSupport included, try demodulize method

http://api.rubyonrails.org/classes/ActiveSupport/Inflector.html

answered May 13, 2015 at 17:57

djaszczurowski

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1 Comment

aceofbassgreg Over a year ago

Note that you must call :demodulize on the string, not the class. For instance: A::B::C.name.demodulize (return string via :name, then call :demodulize)

La-comadreja · Accepted Answer · 2015-05-13 17:58:04Z

0

It's quite simple.

AisisWriter::Controllers::CommentsManagement::CommentsHandler.name.split(':').last

answered May 13, 2015 at 17:58

La-comadreja

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5 Comments

Sergio Tulentsev Over a year ago

It's better to split on "::". End result is the same, but reveals intention better.

La-comadreja Over a year ago

why, if the single colon doesn't appear anywhere else in the name?

Sergio Tulentsev Over a year ago

Result of splitting on "::" can be used for a couple of other tasks. Result of splitting on ":" is useless (except for this case) because of the empty strings in it.

La-comadreja Over a year ago

yes, but I'm not initializing this array or using it for anything else.

Sergio Tulentsev Over a year ago

Anyhow, the separator here is "::", not ":". Benefit of not using full separator is unclear to me.

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