Assuming what you're wanting to do is create a method that exists for all AR descendants and can be set as a before_save hook whenever you call something similar to 'before_save :test => :title, :content' then you could always write your own class method like this:
<code language="ruby"> class ActiveRecord::Base class << self # This class method just defines a new aptly named instance method # that is then registered with before_save. The new instance method # is a simple delegate to the real Model#test method you already have # defined and working. def test(*attrs) self.class_eval <<-EOC def before_save_test_#{attrs.join('_and_')} self.test(*#{attrs.inspect}) end before_save :before_save_test_#{attrs.join('_and_')} EOC end end
# Here is the stub for your real Model#test method. It will be # called with the exact list of arguments given to the # Model.test class method. def test(*attrs) puts "instance test called with #{attrs.inspect}" end end </code>
And then use it like this:
<code language="ruby"> class Post < ActiveRecord::Base test :title, :content end </code>
Obviously, you'll need to ensure that the snippet above defining the custom class method gets loaded after ActiveRecord::Base does or re- factor it to ensure AR is loaded as a result of this snippet being evaluated.
