How do I create a class instance from a string name in ruby?

Question

I have the name of a class and I want to create an instance of that class so that I can loop through each rails attribute that is present in the schema of that class.

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Answer 1

In rails you can just do:

clazz = 'ExampleClass'.constantize

In pure ruby:

clazz = Object.const_get('ExampleClass')

with modules:

module Foo
  class Bar
  end
end

you would use

> clazz = 'Foo::Bar'.split('::').inject(Object) {|o,c| o.const_get c}
  => Foo::Bar 
> clazz.new
  => #