How to display the rendering time of a page?

Rails
1

Hi,

If an admin is logged in, I’m trying to display how long the page took
to render, somewhere at the bottom of the page.

I tried with an around_filter :time_an_action in application.rb

def time_an_action
started = Time.now
yield
@time_to_render = Time.now - started
end

In the layout I added this line:
<%= @time_to_render%>

However, as the time_an_action method has already yielded the page
before the instance variable @time_to_render has been given a value,
it does not display it.

Trying to execute an AJAX call inside the filter or redirecting to
another action, for example:
def time_an_action
started = Time.now
yield
@time_to_render = Time.now - started
redirect_to :controller => “admin”, :action => “display_time”
end

def display_time
render :update do |page|
page.replace_html “time_to_render”, @time_to_render
end
end

Gives the error of “You can’t render or redirect twice in the same
action”…

Any suggestions?

Thanks!

Rai

2

Hi Rai,

This is untested code, hope it works…

Class MyTimer
attr_reader :elapsed_time
def initiailize
@elapsed_time = nil
end
def before_filter
@start_time = Time.now
end
def after_filter
@end_time = Time.now
@elapsed_time = @end_time - @start_time
end
end

in our layout.rhtml at the bottom, i guess u can put this code.

Time take to render <%= @elapsed_time %>

And in application.rb (controller)
require ‘mytimer’
class Application < ActionController::Base
around_filter MyTimer.new
end

P.s:
The above code is untested, you can further optimize it. Sorry, i
don’t have ruby installed in this system.
May find syntax error.

Hope it works,

Regards,
Raghu Kumar K