dynamic path helpers with an ActiveRecord object.

paths.rb

I have a controller/action with a helper path like this : 

new_controller_path(:foo => {:record_type => 'Group', :record_id => group.id})  # This returns /foo/new?foo[record_type]=Group&foo[record_id]=123 which is what I want.


# I was hoping one of these two would return the SAME THING as above.
new_controller_path(Group.new(:record => group))          # This returns /foo/new but I want same thing as above.
new_controller_path(:foo => Group.new(:record => group))  # This returns /foo/new but I want same thing as above.

# My ultimate goal was to reduce the length of the helper line a bit.

# Thanks