ruby script/plugin install http://dev.diarrhea.ch/svn/rails_plugins/trunk/redcloth_template/

Use the class method auto_convert to specify fields, and pass symbols for the helpers in the :with option:

class MyModel < ActiveRecord::Base
  auto_convert :name, :text, :with => :strip_tags
end

You can specify multiple helpers by passing an array. The helpers will be run in the order they’re specified in:

class MyModel < ActiveRecord::Base
  auto_convert :name, :text, :with => [ :strip_tags, :simple_format ]
end

For more complex cases, pass a block which will be given the value. The helpers are also available in the context of the block:

class MyModel < ActiveRecord::Base
  auto_convert :name, :text do |value|
    strip_tags(value).strip.gsub(/[^\w ]/, '')
  end
end

There is currently no advanced documentation for this plugin.