as_load_path

Returns String#underscore applied to the module name minus trailing classes.

  ActiveRecord.as_load_path               # => "active_record"
  ActiveRecord::Associations.as_load_path # => "active_record/associations"
  ActiveRecord::Base.as_load_path         # => "active_record" (Base is a class)

The <a href="/rails/Kernel">Kernel</a> module gives an empty string by definition.

  Kernel.as_load_path # => ""
  Math.as_load_path   # => "math"