Method: ActionView::Helpers::NumberHelper#number_to_currency

Defined in:
lib/action_view/helpers/number_helper.rb

#number_to_currency(number, options = {}) ⇒ Object

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

Options

  • :locale - Sets the locale to be used for formatting (defaults to current locale).

  • :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 for non-negative numbers (defaults to “%u%n”).

    Fields are <tt>%u</tt> for the currency, and <tt>%n</tt>
for the number.

  • :negative_format - Sets the format for negative numbers (defaults to prepending

    an hyphen to the formatted number given by <tt>:format</tt>).
Accepts the same fields than <tt>:format</tt>, except
<tt>%n</tt> is here the absolute value of the number.

  • :raise - If true, raises InvalidNumberError when the argument is invalid.

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(1234567890.506, :locale => :fr)   # => 1 234 567 890,51 €
number_to_currency("123a456")                        # => $123a456

number_to_currency("123a456", :raise => true)        # => InvalidNumberError

number_to_currency(-1234567890.50, :negative_format => "(%u%n)")
# => ($1,234,567,890.50)
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;



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# File 'lib/action_view/helpers/number_helper.rb', line 124

def number_to_currency(number, options = {})
  return unless number

  options.symbolize_keys!

  defaults  = I18n.translate(:'number.format', :locale => options[:locale], :default => {})
  currency  = I18n.translate(:'number.currency.format', :locale => options[:locale], :default => {})
  currency[:negative_format] ||= "-" + currency[:format] if currency[:format]

  defaults  = DEFAULT_CURRENCY_VALUES.merge(defaults).merge!(currency)
  defaults[:negative_format] = "-" + options[:format] if options[:format]
  options   = defaults.merge!(options)

  unit      = options.delete(:unit)
  format    = options.delete(:format)

  if number.to_f < 0
    format = options.delete(:negative_format)
    number = number.respond_to?("abs") ? number.abs : number.sub(/^-/, '')
  end

  begin
    value = number_with_precision(number, options.merge(:raise => true))
    format.gsub(/%n/, value).gsub(/%u/, unit).html_safe
  rescue InvalidNumberError => e
    if options[:raise]
      raise
    else
      formatted_number = format.gsub(/%n/, e.number).gsub(/%u/, unit)
      e.number.to_s.html_safe? ? formatted_number.html_safe : formatted_number
    end
  end

end