activescaffold/active_scaffold

module ActiveScaffold
  module Bridges
    class Paperclip
      module PaperclipBridgeHelpers
        mattr_accessor :thumbnail_style
        self.thumbnail_style = :thumbnail

        def self.generate_delete_helper(klass, field)
          klass.class_eval <<-CODE, __FILE__, __LINE__ + 1 unless klass.method_defined?(:"delete_#{field}=")
            attr_reader :delete_#{field}

            def delete_#{field}=(value)
              value = (value == "true") if String === value
              return unless value

              # passing nil to the file column causes the file to be deleted. Don't delete if we just uploaded a file!
              self.#{field} = nil unless self.#{field}.dirty?
            end
          CODE
        end
      end
    end
  end
end