FIX: Polymorphic bookmarks for new user narrative bot (#16683)

This commit allows the new user narrative bot to work
with polymorphic bookmarks, gated behind the
use_polymorphic_bookmarks site setting.

plugins/discourse-narrative-bot/lib/discourse_narrative_bot/new_user_narrative.rb

@@ -243,7 +243,6 @@ module DiscourseNarrativeBot
       post
     end
 
-    # TODO (martin) [POLYBOOK] Fix up narrative bot bookmark interactions in a separate PR.
     def missing_bookmark
       return unless valid_topic?(@post.topic_id)
       return if @post.user_id == self.discobot_user.id
@@ -254,7 +253,6 @@ module DiscourseNarrativeBot
       false
     end
 
-    # TODO (martin) [POLYBOOK] Fix up narrative bot bookmark interactions in a separate PR.
     def reply_to_bookmark
       return unless valid_topic?(@post.topic_id)
       return unless @post.user_id == self.discobot_user.id

plugins/discourse-narrative-bot/plugin.rb

@@ -281,12 +281,15 @@ after_initialize do
     end
   end
 
-  # TODO (martin) [POLYBOOK] Fix up narrative bot bookmark interactions in a separate PR.
   self.add_model_callback(Bookmark, :after_commit, on: :create) do
-    if self.post && self.user.enqueue_narrative_bot_job?
+    if self.user.enqueue_narrative_bot_job?
+      if SiteSetting.use_polymorphic_bookmarks && self.bookmarkable_type == "Post"
+        Jobs.enqueue(:bot_input, user_id: self.user_id, post_id: self.bookmarkable_id, input: "bookmark")
+      elsif !SiteSetting.use_polymorphic_bookmarks && self.post.present?
         Jobs.enqueue(:bot_input, user_id: self.user_id, post_id: self.post_id, input: "bookmark")
       end
     end
+  end
 
   self.on(:topic_notification_level_changed) do |_, user_id, topic_id|
     user = User.find_by(id: user_id)

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

@@ -248,7 +248,22 @@ describe DiscourseNarrativeBot::NewUserNarrative do
         end
       end
 
-      it 'should create the right reply when bookmarks with reminders are enabled' do
+      it 'adds an after commit model callback to bookmark' do
+        Jobs.run_later!
+        bookmark = Fabricate(:bookmark, post: Fabricate(:post))
+        expect_job_enqueued(job: :bot_input, args: { user_id: bookmark.user_id, post_id: bookmark.post_id, input: "bookmark" })
+      end
+
+      it 'adds an after commit model callback to bookmark for polymorphic bookmarks (but only for post polymorphic bookmarks)' do
+        SiteSetting.use_polymorphic_bookmarks = true
+        Jobs.run_later!
+        bookmark = Fabricate(:bookmark, bookmarkable: Fabricate(:post))
+        expect_job_enqueued(job: :bot_input, args: { user_id: bookmark.user_id, post_id: bookmark.bookmarkable_id, input: "bookmark" })
+        bookmark2 = Fabricate(:bookmark, bookmarkable: Fabricate(:topic))
+        expect_not_enqueued_with(job: :bot_input, args: { user_id: bookmark.user_id, post_id: kind_of(Integer), input: "bookmark" })
+      end
+
+      it 'should create the right reply when the bookmark is created' do
         post.update!(user: discobot_user)
         narrative.expects(:enqueue_timeout_job).with(user)