def user_review(user_id, book_id, params = {})
      data = request('/review/show_by_user_and_book.xml', params.merge(v: "2", user_id: user_id, book_id: book_id))
      Hashie::Mash.new(data["review"])
    end
def user_review(user_id, book_id, params = {})
      data = request('/review/show_by_user_and_book.xml', params.merge(v: "2", user_id: user_id, book_id: book_id))
      Hashie::Mash.new(data["review"])
    end
Get a user's review for a given book