How do I find where a constant is defined in Ruby?

There is a better way to do this as of Ruby 2.7, which is Module.const_source_location.

> Admin.const_source_location(:LIMIT)
#=> ["SOME_PATH/user.rb", 2]

References:

In ruby, $"holds all the file names that are loaded via Kernel.load. So you could try something like this:

constant = User
$".detect{|load_path|
  load_path.include?(constant.to_s.underscore)
}

Note: The method underscore is part of Rails/ActiveSupport

Related