Simplify creating voters in specs

spec/models/user_spec.rb

@@ -4,9 +4,6 @@ describe User do
 
   describe "#headings_voted_within_group" do
     it "returns the headings voted by a user" do
-      user1 = create(:user)
-      user2 = create(:user)
-
       budget = create(:budget)
       group = create(:budget_group, budget: budget)
 
@@ -19,9 +16,8 @@ describe User do
       san_franciso_investment = create(:budget_investment, heading: san_francisco)
       wyoming_investment = create(:budget_investment, heading: wyoming)
 
-      create(:vote, votable: wyoming_investment, voter: user1)
-      create(:vote, votable: san_franciso_investment, voter: user1)
-      create(:vote, votable: new_york_investment, voter: user1)
+      user1 = create(:user, votables: [wyoming_investment, san_franciso_investment, new_york_investment])
+      user2 = create(:user)
 
       expect(user1.headings_voted_within_group(group)).to match_array [new_york, san_francisco, wyoming]
       expect(user1.headings_voted_within_group(group)).not_to include(another_heading)
@@ -30,10 +26,9 @@ describe User do
     end
 
     it "returns headings with multiple translations only once" do
-      user = create(:user)
       group = create(:budget_group)
       heading = create(:budget_heading, group: group, name_en: "English", name_es: "Spanish")
-      create(:vote, votable: create(:budget_investment, heading: heading), voter: user)
+      user = create(:user, votables: [create(:budget_investment, heading: heading)])
 
       expect(user.headings_voted_within_group(group).count).to eq 1
     end