expand_path(...) public

Converts a pathname to an absolute pathname. Relative paths are referenced from the current working directory of the process unless dir_string is given, in which case it will be used as the starting point. The given pathname may start with a ``~’’, which expands to the process owner’s home directory (the environment variable HOME must be set correctly). ``~user’‘ expands to the named user’s home directory. 

   File.expand_path("~oracle/bin")           #=> "/home/oracle/bin"
   File.expand_path("../../bin", "/tmp/x")   #=> "/bin"
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April 23, 2009
6 thanks

Argument Ordering

Be aware that the order of arguments for this method is the opposite of File.join:

File.expand_path('foo', '/bar')   # => "/bar/foo"
File.join('foo', '/bar')          # => "foo/bar"
April 16, 2010
5 thanks

Require file from the same folder

If you want to require file from the same folder, the simplest way is

require File.expand_path('../file-to-require', __FILE__)

If your file is /lib/book.rb

File.expand_path('../page', '/lib/book.rb') => '/lib/page.rb'
September 25, 2013
0 thanks

Anothery way

This Worked For Me 

require File.expand_path('../app/models/extenstions/active_record_ext', File.dirname(__FILE__))

I did this in application.rb