has_many :through basic fubar

I'm trying to do, what seems like, a very basic join. However, the
association just doesn't seem to work. I'm sure it's something very
simple but I don't know what.

class Role < ActiveRecord::Base
  belongs_to :packages
  belongs_to :users

class Package < ActiveRecord::Base
  has_many :roles
  has_many :users, :through => :roles

class User < ActiveRecord::Base
  has_many :roles
  has_many :packages, :through => :roles

  create_table "packages", :force => true do |t|
    t.string "tracking"
    t.datetime "created_at"
    t.datetime "updated_at"

  create_table "roles", :force => true do |t|
    t.integer "user_id"
    t.integer "package_id"
    t.string "role"

  create_table "users", :force => true do |t|
    t.string "user_name"
    t.string "first"
    t.string "last"

With that, I can do:

@package = Package.new
@roles = @package.roles

@roles.inspect # OK

But I can't do:

@package = Package.new
@users = @package.users

or not:

@package.roles.collect { |a| a.users }
@users = @package.users


Try to change :

Oh for Pete's sake. I thought I tried that both ways... I probably had
some other error at the time. THANK YOU SO MUCH!!