number_to_currency fails with "NoMethodError: undefined method `>=' for nil:NilClass"

Fabian, can you try it using the latest Rails version from git?.
Thanks

not reproducible in the latest master:

ruby-1.8.7-p249 > foo.number_to_currency(101.00)
 => "$101.00"

ruby-1.9.1-p378 > foo.number_to_currency(101.00)
=> "$101.00"

ruby-1.9.2-head > foo.number_to_currency(101.00)
 => "$101.00"

ok, I investigated a little further, and the bug only occurs if the default locale is set to :de .
So, if I set

config.i18n.default_locale = :de

in config/application.rb and execute the following in the console:

foo = ActionView::Base.new
foo.extend ActionView::Helpers::NumberHelper
foo.number_to_currency(101.00)

I am able to reproduce the bug with a fresh app.

Also happens with edge rails.

ok, some more information:
Apparently, if you set a locale different than :en, the number helpers stop working.
That is because the options are set as follows (in action_view/helpers/number_helper.rb):

        defaults  = I18n.translate(:'number.format', :locale => options[:locale], :default => {})

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

    options = options.reverse_merge(defaults)

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

    begin
      value = number_with_precision(number, options.merge(:raise => true))
      format.gsub(/%n/, value).gsub(/%u/, unit).html_safe</code>

defaults  = I18n.translate(:'number.format', :locale => options[:locale], :default => {})

Patch for master

new patch

Pastorino, this still does not solve the problem. It should be something like this:

defaults  = default_currency_values.merge(defaults).merge!(currency)

+1

This work fines for me. All tests pass.

The correct patch here