How to specify the number of decimal places displayed in Ruby on Rails

Posted on 14 August 2006

The sprintf Ruby class provides the ability to specify the number of decimal places to display.

sprintf("%.1f",track.ratings.average('rating'))

In this example I'm getting the average ratings of a track and ensuring that the average is rounded to 1 decimal place.

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Comments left...

• Thanks, I did a quick google, your entry popped up, its exactly what I needed :)

  Christopher Mar at 03 Feb 08 at 06:48

• Thank you!

  Peter at 15 Mar 08 at 09:23

• Nice snippet. Cheers!

  Stephan at 22 May 08 at 10:17

• Thanks paul, perfect!

  Rob Aldred - Digital Marketing at 04 Jul 08 at 04:34

• Warning – with some old versions of Ruby there is a bug with sprintf where it takes 0.01 and returns 0.1. If you find things don’t quite look right have a google around.

  x = BigDecimal.new(‘2.02’)
  x.to_f

  Some versions of 1.8.7 will return 2.2!

  Francis Fish at 27 Apr 10 at 03:02

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