@@ -21,11 +21,11 @@ class Class def abstract abstract_class = self - raise_if_abstract = lambda do + raise_if_abstract = lambda do |*args, &block| if self == abstract_class raise AbstractClassError, "#{self} is an abstract class and cannot be instantiated" else - super + super *args, &block end end lib/abstraction.rb @@ -5,11 +5,22 @@ $: << File.join(File.dirname(__FILE__), '..', 'lib') require 'abstraction' describe "#abstract" do - class Animal + # Similar to ActiveRecord::Base.new + class Organism + def self.new(&b) + o = super + yield o if block_given? + o + end + end + + class Animal < Organism abstract end - class Cat < Animal; end + class Cat < Animal + attr_accessor :fur + end it "makes a class non-instantiable via new" do lambda { @@ -29,6 +40,14 @@ describe "#abstract" do }.should_not raise_error(AbstractClassError) end + it "lets subclasses be instantiated via new with a block" do + cat = nil + lambda { + cat = Cat.new { |c| c.fur = :tabby } + }.should_not raise_error(AbstractClassError) + cat.fur.should == :tabby + end + it "lets subclasses be instantiated via allocate" do lambda { Cat.new spec/abstraction_spec.rb 92afdd7d6c5cb6d0c110b2216ae1b063a9ee70e1 Peter Jaros peeja@dropio.com http://github.com/Peeja/abstraction/commit/33f989487584b730e3ab07da482dac0d06cba5c5 33f989487584b730e3ab07da482dac0d06cba5c5 2009-03-31T13:06:41-07:00 2009-03-31T13:06:41-07:00 #abstract lets subclasses be instantiated via new with a block c719ec99380df4ce3e94402acb0319aa7a08ed21 Peter Jaros peeja@dropio.com