Adds scopes to officer_assignment

app/models/poll/officer_assignment.rb

@@ -17,6 +17,9 @@ class Poll
     scope :by_officer_and_poll, ->(officer_id, poll_id) do
       where("officer_id = ? AND poll_booth_assignments.poll_id = ?", officer_id, poll_id)
     end
+    scope :by_officer, ->(officer){ where(officer_id: officer.id) }
+    scope :by_poll, ->(poll){ joins(:booth_assignment).where("poll_booth_assignments.poll_id" => poll.id) }
+    scope :by_date, ->(date){ where(date: date) }
 
     before_create :log_user_data