_compile_options

# File activesupport/lib/active_support/callbacks.rb, line 252
      def _compile_options(options)
        conditions = ["true"]

        unless options[:if].empty?
          conditions << Array.wrap(_compile_filter(options[:if]))
        end

        unless options[:unless].empty?
          conditions << Array.wrap(_compile_filter(options[:unless])).map {|f| "!#{f}"}
        end

        conditions.flatten.join(" && ")
      end