FIX: Allow users to create polls in PMs with non human users (#9055)

plugins/discourse-narrative-bot/spec/discourse_narrative_bot/advanced_user_narrative_spec.rb

@@ -606,6 +606,19 @@ RSpec.describe DiscourseNarrativeBot::AdvancedUserNarrative do
         )
       end
 
+      it 'allows new users to create polls' do
+        user.update(trust_level: 0)
+
+        post = PostCreator.create(user, topic_id: topic.id, raw: <<~RAW)
+          [poll type=regular]
+          * foo
+          * bar
+          [/poll]
+        RAW
+
+        expect(post.errors[:base].size).to eq(0)
+      end
+
       describe 'when post is not in the right topic' do
         it 'should not do anything' do
           other_post

plugins/poll/lib/post_validator.rb

@@ -9,7 +9,7 @@ module DiscoursePoll
     def validate_post
       min_trust_level = SiteSetting.poll_minimum_trust_level_to_create
 
-      if @post&.user&.staff? || @post&.user&.trust_level >= TrustLevel[min_trust_level]
+      if @post&.user&.staff? || @post&.user&.trust_level >= TrustLevel[min_trust_level] || @post&.topic&.pm_with_non_human_user?
         true
       else
         @post.errors.add(:base, I18n.t("poll.insufficient_rights_to_create"))

plugins/poll/spec/controllers/posts_controller_spec.rb

@@ -348,6 +348,23 @@ describe PostsController do
       json = ::JSON.parse(response.body)
       expect(json["errors"][0]).to eq(I18n.t("poll.insufficient_rights_to_create"))
     end
+
+    it "skips the check in PMs with bots" do
+      user = Fabricate(:user, trust_level: 1)
+      topic = Fabricate(:private_message_topic, topic_allowed_users: [
+        Fabricate.build(:topic_allowed_user, user: user),
+        Fabricate.build(:topic_allowed_user, user: Discourse.system_user)
+      ])
+      Fabricate(:post, topic_id: topic.id, user_id: Discourse::SYSTEM_USER_ID)
+
+      log_in_user(user)
+
+      post :create, params: {
+        topic_id: topic.id, raw: "[poll]\n- A\n- B\n[/poll]"
+      }, format: :json
+
+      expect(::JSON.parse(response.body)["errors"]).to eq(nil)
+    end
   end
 
   describe "regular user with equal trust level" do