Question

I have two classes

class ClassOne
    def do_something
      [...]
    end
end

class ClassTwo
    def do_something
      [...]
    end
end

I am getting a class name (either ClassOne or ClassTwo) from the database and I want to call do_something in that class

so I have

class_name = "ClassOne"

and I want to call ClassOne.do_something or ClassTwo.do_something if class_name is equals to “ClassTwo”.

I can’t do it using a simple if condition, I have many classes and am checking if the class exists before calling..

Is there a way to do it?

Answer 1

For vanilla ruby:

Kernel.const_get('ClassOne').do_something

For Rails:

'ClassOne'.constantize.do_something