class BlankSlate

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).

Public Class Methods

find_hidden_method(name) click to toggle source

# File lib/blankslate.rb, line 28
def find_hidden_method(name)
  @hidden_methods ||= {}
  @hidden_methods[name] || superclass.find_hidden_method(name)
end

hide(name) click to toggle source

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

# File lib/blankslate.rb, line 20
def hide(name)
  methods = instance_methods.map(&:to_sym)
  return unless  methods.include?(name.to_sym) && name !~ /^(__|instance_eval|object_id)/
  @hidden_methods ||= {}
  @hidden_methods[name.to_sym] = instance_method(name)
  undef_method name
end

reveal(name) click to toggle source

Redefine a previously hidden method so that it may be called on a blank slate object.

# File lib/blankslate.rb, line 35
def reveal(name)
  hidden_method = find_hidden_method(name)
  fail "Don't know how to reveal method '#{name}'" unless hidden_method
  define_method(name, hidden_method)
end