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Can someone tell me if I'm just going about the setup the wrong way? I have the following models that have has_many.through associations: class Listing < ActiveRecord::Base attr_accessible ... has_many :listing_features has_many :features, :through => :listing_features validates_presence_of ... ... end class Feature < ActiveRecord::Base attr_accessible ... validates_presence_of ... validates_uniqueness_of ... has_many :listing_features has_many :listings, :through => :listing_features end class ListingFeature < ActiveRecord::Base attr_accessible :feature_id, :listing_id belongs_to :feature belongs_to :listing end I'm using Rails 3.1.rc4, FactoryGirl 2.0.2, factory_girl_rails 1.1.0, and rspec. Here is my basic rspec rspec sanity check for the :listing factory: it "creates a valid listing from factory" do Factory(:listing).should be_valid end Here is Factory(:listing) FactoryGirl.define do factory :listing do headline 'headline' home_desc 'this is the home description' association :user, :factory => :user association :layout, :factory => :layout association :features, :factory => :feature end end The :listing_feature and :feature factories are similarly setup. If the association :features line is commented out, then all my tests pass. When it is association :features, :factory => :feature the error message is undefined method 'each' for #<Feature> which I thought made sense to me because because listing.features returns an array. So I changed it to association :features, [:factory => :feature] and the error I get now is ArgumentError: Not registered: features Is it just not sensibl

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