Shifts are destroyed when a booths is unassigned. An alert appears if there are shifts, but it doesn't if there aren't.

app/models/poll/booth_assignment.rb

@@ -3,23 +3,26 @@ class Poll
     belongs_to :booth
     belongs_to :poll
 
+    before_destroy :destroy_poll_shifts, only: :destroy
+
     has_many :officer_assignments, class_name: "Poll::OfficerAssignment", dependent: :destroy
     has_many :officers, through: :officer_assignments
     has_many :voters
     has_many :partial_results
     has_many :recounts
 
-    before_destroy :destroy_poll_shifts
-    
-    def has_shifts?
-      
+    def shifts?
+      shifts.empty? ? false : true
     end
 
     private
 
+      def shifts
+        Poll::Shift.where(booth_id: booth_id, officer_id: officer_assignments.pluck(:officer_id), date: officer_assignments.pluck(:date))
+      end
+
       def destroy_poll_shifts
-#        officers = poll.officers_in_booth(booth.id)
-#        Poll::Shift.where(officer_id: officers, booth_id: booth.id)
+        shifts.destroy_all
       end
   end
 end