def render(context_scope = nil, locals = nil, &block)
      apply(context_scope, locals, &block) if context_scope || locals || block

      cache_results do
        send("to_#{@_options[:format]}")
      end
    end
def render(context_scope = nil, locals = nil, &block)
      apply(context_scope, locals, &block) if context_scope || locals || block

      cache_results do
        send("to_#{@_options[:format]}")
      end
    end
Renders the representation based on a previous apply
 Rabl::Engine.new("...source...", { :format => "xml" }).apply(context_scope, { :foo => "bar", :object => @user }).render