number_with_delimiter
number_with_delimiter(number, options = {})
public
Delegates to ActiveSupport::NumberHelper#number_to_delimited.
Additionally, supports a :raise option that will cause InvalidNumberError to be raised if number is not a valid number:
number_with_delimiter("12x34") # => "12x34" number_with_delimiter("12x34", raise: true) # => InvalidNumberError
Alternative: use 1000.humanize
1.humanize == “1″ 1000000.humanize == “1.000.000″ 1000.12345.humanize == “1.000,12″
http://pragmatig.wordpress.com/2008/10/25/numbers-for-humans-humanize-for-numeric/
Deprecation warning for old-style options
You will get a warning if you don’t define your separators as a hash:
DEPRECATION WARNING: number_with_delimiter takes an option hash instead of separate delimiter and precision arguments
So while you can still use that style, it’s not without a scolding.