module ActiveSupport # Usually key value pairs are handled something like this: # # h = {} # h[:boy] = 'John' # h[:girl] = 'Mary' # h[:boy] # => 'John' # h[:girl] # => 'Mary' # # Using +OrderedOptions+, the above code could be reduced to: # # h = ActiveSupport::OrderedOptions.new # h.boy = 'John' # h.girl = 'Mary' # h.boy # => 'John' # h.girl # => 'Mary' class OrderedOptions < Hash alias_method :_get, :[] # preserve the original #[] method protected :_get # make it protected def []=(key, value) super(key.to_sym, value) end def [](key) super(key.to_sym) end def method_missing(name, *args) name_string = name.to_s if name_string.chomp!('=') self[name_string] = args.first else self[name] end end def respond_to_missing?(name, include_private) true end end class InheritableOptions < OrderedOptions def initialize(parent = nil) if parent.kind_of?(OrderedOptions) # use the faster _get when dealing with OrderedOptions super() { |h,k| parent._get(k) } elsif parent super() { |h,k| parent[k] } else super() end end def inheritable_copy self.class.new(self) end end end