Using number_with_precision on controller in rails3

Question

I want to use this helper method on controller. Any way to achieve this?

On a broader sense, requiring View Helpers in Controller is bad design. But sometimes the system mandates it. So if you post some code on how you intend to use it, it'll be helpful. A quick, but dirty and not recommended way is to use `include ActionView::Helper` in your controller. — Swanand, Dec 13 '10 at 06:39
Related if not duplicate: http://stackoverflow.com/questions/15733971/how-do-i-require-numberhelper-and-make-it-work — Andrew Grimm, Jan 18 '16 at 00:32

score 30 · Accepted Answer · answered Dec 13 '10 at 06:40

30

Probably not a great idea, but if you must, include the helper like so:

class WhateverController
  include ActionView::Helpers::NumberHelper

  def show
    render :text => number_with_precision(2342.234, :precision => 2)
  end

end

answered Dec 13 '10 at 06:40

jenjenut233

1,938
16
13

score 7 · Answer 2 · answered Sep 17 '15 at 08:40

7

A much better way to control number precision is rails controllers is to use sprintf

"%.2f" % 2342.234 => "2342.23"
"%.6f" % 2342.234 => "2342.234000"

answered Sep 17 '15 at 08:40

Mark Oliver

79
1
2

Why is sprintf better? – MCB Feb 19 '17 at 20:05
More flexibility than using number_with_precision and doesn't require you to include view helpers in your controller – Mark Oliver Apr 27 '17 at 13:20
It doesn't have a `delimiter:` option. – Chloe Jun 13 '17 at 20:40

Using number_with_precision on controller in rails3

2 Answers2

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