Plural Name in Association in Rails

I have user model and a car model I want to have a model which will hold the settings for each car and each user so I do ``` class CarSettings < ActiveRecord::Base belongs_to :user belongs_to :car end ``` for user: ``` has_many :car_settings ``` and for cars: ``` has_many :car_settings has_many :users, :through => :car_settings ``` note the name CarSettings, this isn't a mistake, I want it to be settings and not setting When I do ``` c=Car.first c.users ``` I get ``` NameError: uninitialized constant Car::CarSetting from C:/Ruby193/lib/ruby/gems/1.9.1/gems/activerecord-3.2.12/lib/active_record/inheritance.rb:111:in `compute_type' ``` it is looking for a singular car_setting and not car_settings. How can I fix this?