module PaperclipBridgeHelpers
  mattr_accessor :thumbnail_style
  self.thumbnail_style = :thumbnail

  def self.generate_delete_helper(klass, field)
    klass.class_eval <<-EOF, __FILE__, __LINE__ + 1 unless klass.methods.include?("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
    EOF
  end
end