FIX: polls are always editable until the first vote

plugins/poll/plugin.rb

@@ -293,8 +293,10 @@ after_initialize do
         # are the polls different?
         if polls.keys != previous_polls.keys || current_options != previous_options
 
+          has_votes = previous_polls.keys.map { |p| previous_polls[p]["voters"].to_i }.sum > 0
+
           # outside of the 5-minute edit window?
-          if post.created_at < 5.minutes.ago
+          if post.created_at < 5.minutes.ago && has_votes
             # cannot add/remove/rename polls
             if polls.keys.sort != previous_polls.keys.sort
               post.errors.add(:base, I18n.t("poll.cannot_change_polls_after_5_minutes"))
@@ -305,7 +307,7 @@ after_initialize do
             if User.staff.pluck(:id).include?(post.last_editor_id)
               # staff can only edit options
               polls.each_key do |poll_name|
-                if polls[poll_name]["options"].size != previous_polls[poll_name]["options"].size
+                if polls[poll_name]["options"].size != previous_polls[poll_name]["options"].size && previous_polls[poll_name]["voters"].to_i > 0
                   post.errors.add(:base, I18n.t("poll.staff_cannot_add_or_remove_options_after_5_minutes"))
                   return
                 end

plugins/poll/spec/controllers/posts_controller_spec.rb

@@ -126,26 +126,30 @@ describe PostsController do
           end
         end
 
-        it "OP cannot change the options" do
-          xhr :put, :update, { id: post_id, post: { raw: new_option } }
-          expect(response).not_to be_success
-          json = ::JSON.parse(response.body)
-          expect(json["errors"][0]).to eq(I18n.t("poll.op_cannot_edit_options_after_5_minutes"))
-        end
+        describe "with no vote" do
 
-        it "staff can change the options" do
-          log_in_user(Fabricate(:moderator))
-          xhr :put, :update, { id: post_id, post: { raw: new_option } }
-          expect(response).to be_success
-          json = ::JSON.parse(response.body)
-          expect(json["post"]["polls"]["poll"]["options"][1]["html"]).to eq("C")
-        end
+          it "OP can change the options" do
+            xhr :put, :update, { id: post_id, post: { raw: new_option } }
+            expect(response).to be_success
+            json = ::JSON.parse(response.body)
+            expect(json["post"]["polls"]["poll"]["options"][1]["html"]).to eq("C")
+          end
+
+          it "staff can change the options" do
+            log_in_user(Fabricate(:moderator))
+            xhr :put, :update, { id: post_id, post: { raw: new_option } }
+            expect(response).to be_success
+            json = ::JSON.parse(response.body)
+            expect(json["post"]["polls"]["poll"]["options"][1]["html"]).to eq("C")
+          end
+
+          it "support changes on the post" do
+            xhr :put, :update, { id: post_id, post: { raw: updated } }
+            expect(response).to be_success
+            json = ::JSON.parse(response.body)
+            expect(json["post"]["cooked"]).to match("before")
+          end
 
-        it "support changes on the post" do
-          xhr :put, :update, { id: post_id, post: { raw: updated } }
-          expect(response).to be_success
-          json = ::JSON.parse(response.body)
-          expect(json["post"]["cooked"]).to match("before")
         end
 
         describe "with at least one vote" do
@@ -154,6 +158,21 @@ describe PostsController do
             DiscoursePoll::Poll.vote(post_id, "poll", ["5c24fc1df56d764b550ceae1b9319125"], user.id)
           end
 
+          it "OP cannot change the options" do
+            xhr :put, :update, { id: post_id, post: { raw: new_option } }
+            expect(response).not_to be_success
+            json = ::JSON.parse(response.body)
+            expect(json["errors"][0]).to eq(I18n.t("poll.op_cannot_edit_options_after_5_minutes"))
+          end
+
+          it "staff can change the options" do
+            log_in_user(Fabricate(:moderator))
+            xhr :put, :update, { id: post_id, post: { raw: new_option } }
+            expect(response).to be_success
+            json = ::JSON.parse(response.body)
+            expect(json["post"]["polls"]["poll"]["options"][1]["html"]).to eq("C")
+          end
+
           it "support changes on the post" do
             xhr :put, :update, { id: post_id, post: { raw: updated } }
             expect(response).to be_success