Simplify creating videos for a poll in specs

spec/factories/polls.rb

@@ -129,16 +129,22 @@ FactoryBot.define do
   end
 
   factory :poll_question_answer, class: "Poll::Question::Answer" do
-    association :question, factory: :poll_question
     sequence(:title) { |n| "Answer title #{n}" }
     sequence(:description) { |n| "Answer description #{n}" }
     sequence(:given_order) { |n| n }
+
+    transient { poll { association(:poll) } }
+
+    question { association(:poll_question, poll: poll) }
   end
 
   factory :poll_answer_video, class: "Poll::Question::Answer::Video" do
-    association :answer, factory: :poll_question_answer
     title { "Sample video title" }
     url { "https://youtu.be/nhuNb0XtRhQ" }
+
+    transient { poll { association(:poll) } }
+
+    answer { association(:poll_question_answer, poll: poll) }
   end
 
   factory :poll_booth, class: "Poll::Booth" do

spec/features/polls/polls_spec.rb

@@ -136,13 +136,11 @@ describe "Polls" do
     end
 
     scenario "Show answers with videos" do
-      question = create(:poll_question, poll: poll)
+      create(:poll_answer_video, poll: poll, title: "Awesome video", url: "youtube.com/watch?v=123")
-      answer = create(:poll_question_answer, question: question, title: "Chewbacca")
-      video = create(:poll_answer_video, answer: answer, title: "Awesome project video", url: "https://www.youtube.com/watch?v=123")
 
       visit poll_path(poll)
 
-      expect(page).to have_link("Awesome project video", href: "https://www.youtube.com/watch?v=123")
+      expect(page).to have_link("Awesome video", href: "youtube.com/watch?v=123")
     end
 
     scenario "Lists questions from proposals as well as regular ones" do