BlankSlate provides an abstract base class with no predefined methods (except for __send__ and __id__). BlankSlate is useful as a base class when writing classes that depend upon method_missing (e.g. dynamic proxies).

Methods
H
Class Public methods
hide(name)

Hide the method named name in the BlankSlate class. Don’t hide instance_eval or any method beginning with “__”.

Source: show 

# File rails/activesupport/lib/active_support/vendor/builder/blankslate.rb, line 22
def hide(name)
  undef_method name if
    instance_methods.include?(name.to_s) and
    name !~ %r^(__|instance_eval)/
end