gistfile1.rb

# Make a user that we'll add a book to.
user = User.create!
controller.stub(:current_user) { user }

# This prints []. The book list is empty.
p user.books

# Expect a book to be added to the user. This fails (see below)
expect {
  post :create, :id => asin
}.to change { user.books }.from([]).to([book])

#     Failure/Error: expect {
#       books should have initially been [], but was [#<Book id: 1, asin: "the-asin", title: "Hamlet", authors: "Bill Shakes", pages: 0, is_ebook: false, image_url: nil, icon_url: nil, details_url: "http://example.com/hamlet", created_at: "2011-11-23 21:47:45", updated_at: "2011-11-23 21:47:45", editorial_review: nil>]

# This seems wrong. `user.books` *is* initially []. Help? I'm running RSpec 2.7.1 on Ruby 1.8.7 and Rails 3.0.9. It also happens with RSpec 2.5.