method

number_to_currency

v2.3.8 - Show latest stable - 6 notes - Class: ActionView::Helpers::NumberHelper

number_to_currency(number, options = {}) public

Formats a number into a currency string (e.g., $13.65). You can customize the format in the options hash.

Options

:precision - Sets the level of precision (defaults to 2).
:unit - Sets the denomination of the currency (defaults to "$").
:separator - Sets the separator between the units (defaults to ".").
:delimiter - Sets the thousands delimiter (defaults to ",").
:format - Sets the format of the output string (defaults to "%u%n"). The field types are:
```
  %u  The currency unit
  %n  The number
```

Examples

 number_to_currency(1234567890.50)                    # => $1,234,567,890.50
 number_to_currency(1234567890.506)                   # => $1,234,567,890.51
 number_to_currency(1234567890.506, :precision => 3)  # => $1,234,567,890.506

 number_to_currency(1234567890.50, :unit => "&pound;", :separator => ",", :delimiter => "")
 # => &pound;1234567890,50
 number_to_currency(1234567890.50, :unit => "&pound;", :separator => ",", :delimiter => "", :format => "%n %u")
 # => 1234567890,50 &pound;

Show source

# File actionpack/lib/action_view/helpers/number_helper.rb, line 73
      def number_to_currency(number, options = {})
        options.symbolize_keys!

        defaults  = I18n.translate('number.format''number.format', :locale => options[:locale], :raise => true) rescue {}
        currency  = I18n.translate('number.currency.format''number.currency.format', :locale => options[:locale], :raise => true) rescue {}
        defaults  = defaults.merge(currency)

        precision = options[:precision] || defaults[:precision]
        unit      = options[:unit]      || defaults[:unit]
        separator = options[:separator] || defaults[:separator]
        delimiter = options[:delimiter] || defaults[:delimiter]
        format    = options[:format]    || defaults[:format]
        separator = '' if precision == 0

        begin
          format.gsub(/%n/, number_with_precision(number,
            :precision => precision,
            :delimiter => delimiter,
            :separator => separator)
          ).gsub(/%u/, unit).html_safe
        rescue
          number
        end
      end

August 29, 2008

6 thanks

Brazilian Real (R$ 1.200,95)

helper:

def number_to_currency_br(number)
  number_to_currency(number, :unit => "R$ ", :separator => ",", :delimiter => ".")
end

October 20, 2008

3 thanks

number_to_euro

in small cells:

12  
€
-->
12 €

def number_to_euro(amount)
  number_to_currency(amount,:unit=>'€').gsub(' ',nbsp)
end

January 15, 2010

3 thanks

Use this in controllers

Sometimes you’re gonna need this in controllers. Just put this in the controller:

include ActionView::Helpers::NumberHelper

October 4, 2011

2 thanks

How to change format automatically depending on locale...

… without passing locale option.

In your application_helper.rb (or in other helper) place following code:

def number_to_currency(number, options = {})
  options[:locale] ||= I18n.locale
  super(number, options)
end

Then, in your locale files:

en-GB:
  number:
    currency:
      format:
        format: "%n %u"
        unit: "USD"

And that is it :)

November 19, 2014

1 thank

Bangladeshi Taka (BDT 1,200.95)

Code example

def to_bdt(amount)
  number_to_currency(amount, :unit => "BDT ", :separator => ".", :delimiter => ",")
end

October 24, 2012

0 thanks

If you happen to face some weird rounding issue...

i.e.

helper.number_to_currency(187)
=> "190 kr"

check out your… translations! Especially ‘significant’ key… In my case it was

number:
   currency:
     format:
       significant: 'false'

that broke rounding. It should have been

number:
   currency:
     format:
       significant: ! 'false'

And now it works perfectly

helper.number_to_currency(187)
=> "187 kr"