Add button to delete a poll

app/controllers/admin/poll/polls_controller.rb

@@ -58,6 +58,16 @@ class Admin::Poll::PollsController < Admin::Poll::BaseController
     @polls = Poll.current
   end
 
+  def destroy
+    if ::Poll::Voter.where(poll: @poll).any?
+      redirect_to admin_poll_path(@poll), alert: t("admin.polls.destroy.unable_notice")
+    else
+      @poll.destroy
+
+      redirect_to admin_polls_path, notice: t("admin.polls.destroy.success_notice")
+    end
+  end
+
   private
 
     def load_geozones