Created
June 4, 2009 08:52
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My attempt at abstracting acts_as_* pattern
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class Class | |
def acts_as(*args) | |
modules_with_options = [] | |
for arg in args | |
if arg.is_a?(Module) | |
modules_with_options << [arg] | |
elsif arg.is_a?(Hash) | |
raise ArgumentError, "Options without module" unless modules_with_options[-1][0].is_a?(Module) | |
modules_with_options[-1][1] = arg | |
end | |
end | |
klass = self | |
for mod, options in modules_with_options | |
klass.send(:instance_exec, options, &mod::ClassContextProc) if defined?(mod::ClassContextProc) | |
klass.send(:include, mod::InstanceMethods) if defined?(mod::InstanceMethods) | |
klass.extend(mod::ClassMethods) if defined?(mod::ClassMethods) | |
end | |
end | |
end | |
module NeverTooDry | |
ClassContextProc = proc do |options| | |
attr_accessor :some_attr | |
class_eval <<-RUBY | |
def #{options[:meta_method_name]}; end | |
RUBY | |
end | |
module InstanceMethods | |
def instance_method; end | |
end | |
module ClassMethods | |
def class_method; end | |
end | |
end | |
module Dummy; end | |
class C | |
acts_as NeverTooDry, { :meta_method_name => "meta_method" }, | |
Dummy | |
end | |
C.class_method | |
c = C.new | |
c.some_attr = 123 | |
c.meta_method | |
c.instance_method |
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