FEATURE: prioritize_solved_topics_in_search to prioritize solved topics (#236)

Many consumers of Discourse solved may want solved topics to show up more
prominently in search. New setting `prioritize_solved_topics_in_search`  (default off) allows 
bumping these topics to the top.

Co-authored-by: Alan Guo Xiang Tan <gxtan1990@gmail.com>

config/locales/server.en.yml

@@ -14,6 +14,7 @@ en:
     accept_solutions_topic_author: "Allow the topic author to accept a solution."
     solved_add_schema_markup: "Add QAPage schema markup to HTML."
     enable_solved_tags: "Tags that will allow users to select solutions."
+    prioritize_solved_topics_in_search: "Prioritize solved topics in search results."
 
   reports:
     accepted_solutions:

config/settings.yml

@@ -34,6 +34,7 @@ plugins:
       - "never"
       - "always"
       - "answered only"
+  prioritize_solved_topics_in_search: false
   enable_solved_tags:
     type: tag_list
     default: ""

plugin.rb

@@ -15,7 +15,7 @@ if respond_to?(:register_svg_icon)
   register_svg_icon "far fa-square"
 end
 
-PLUGIN_NAME = "discourse_solved".freeze
+PLUGIN_NAME = "discourse_solved"
 
 register_asset "stylesheets/solutions.scss"
 register_asset "stylesheets/mobile/solutions.scss", :mobile
@@ -74,13 +74,14 @@ SQL
       isolate_namespace DiscourseSolved
     end
 
-    AUTO_CLOSE_TOPIC_TIMER_CUSTOM_FIELD = "solved_auto_close_topic_timer_id".freeze
+    AUTO_CLOSE_TOPIC_TIMER_CUSTOM_FIELD = "solved_auto_close_topic_timer_id"
+    ACCEPTED_ANSWER_POST_ID_CUSTOM_FIELD = "accepted_answer_post_id"
 
     def self.accept_answer!(post, acting_user, topic: nil)
       topic ||= post.topic
 
       DistributedMutex.synchronize("discourse_solved_toggle_answer_#{topic.id}") do
-        accepted_id = topic.custom_fields["accepted_answer_post_id"].to_i
+        accepted_id = topic.custom_fields[ACCEPTED_ANSWER_POST_ID_CUSTOM_FIELD].to_i
 
         if accepted_id > 0
           if p2 = Post.find_by(id: accepted_id)
@@ -94,7 +95,7 @@ SQL
         end
 
         post.custom_fields["is_accepted_answer"] = "true"
-        topic.custom_fields["accepted_answer_post_id"] = post.id
+        topic.custom_fields[ACCEPTED_ANSWER_POST_ID_CUSTOM_FIELD] = post.id
 
         if defined?(UserAction::SOLVED)
           UserAction.log_action!(
@@ -172,7 +173,7 @@ SQL
 
       DistributedMutex.synchronize("discourse_solved_toggle_answer_#{topic.id}") do
         post.custom_fields.delete("is_accepted_answer")
-        topic.custom_fields.delete("accepted_answer_post_id")
+        topic.custom_fields.delete(ACCEPTED_ANSWER_POST_ID_CUSTOM_FIELD)
 
         if timer_id = topic.custom_fields[AUTO_CLOSE_TOPIC_TIMER_CUSTOM_FIELD]
           topic_timer = TopicTimer.find_by(id: timer_id)
@@ -299,7 +300,10 @@ SQL
       },
     }
 
-    if accepted_answer = Post.find_by(id: topic.custom_fields["accepted_answer_post_id"])
+    if accepted_answer =
+         Post.find_by(
+           id: topic.custom_fields[::DiscourseSolved::ACCEPTED_ANSWER_POST_ID_CUSTOM_FIELD],
+         )
       question_json["answerCount"] = 1
       question_json[:acceptedAnswer] = {
         "@type" => "Answer",
@@ -343,7 +347,8 @@ SQL
     Report.add_report("accepted_solutions") do |report|
       report.data = []
 
-      accepted_solutions = TopicCustomField.where(name: "accepted_answer_post_id")
+      accepted_solutions =
+        TopicCustomField.where(name: ::DiscourseSolved::ACCEPTED_ANSWER_POST_ID_CUSTOM_FIELD)
 
       category_id, include_subcategories = report.add_category_filter
       if category_id
@@ -375,6 +380,25 @@ SQL
     end
   end
 
+  if respond_to?(:register_modifier)
+    register_modifier(:search_rank_sort_priorities) do |priorities, search|
+      if SiteSetting.prioritize_solved_topics_in_search
+        condition = <<~SQL
+          EXISTS
+            (
+              SELECT 1 FROM topic_custom_fields f
+              WHERE topics.id = f.topic_id
+              AND f.name = '#{::DiscourseSolved::ACCEPTED_ANSWER_POST_ID_CUSTOM_FIELD}'
+            )
+        SQL
+
+        priorities.push([condition, 1.1])
+      else
+        priorities
+      end
+    end
+  end
+
   if defined?(UserAction::SOLVED)
     require_dependency "user_summary"
     class ::UserSummary
@@ -444,7 +468,7 @@ SQL
     end
 
     def accepted_answer_post_id
-      id = object.topic.custom_fields["accepted_answer_post_id"]
+      id = object.topic.custom_fields[::DiscourseSolved::ACCEPTED_ANSWER_POST_ID_CUSTOM_FIELD]
       # a bit messy but race conditions can give us an array here, avoid
       begin
         id && id.to_i
@@ -533,7 +557,7 @@ SQL
 
     def topic_accepted_answer
       if topic = (topic_view && topic_view.topic) || object.topic
-        topic.custom_fields["accepted_answer_post_id"].present?
+        topic.custom_fields[::DiscourseSolved::ACCEPTED_ANSWER_POST_ID_CUSTOM_FIELD].present?
       end
     end
   end
@@ -547,7 +571,7 @@ SQL
         "topics.id IN (
         SELECT tc.topic_id
         FROM topic_custom_fields tc
-        WHERE tc.name = 'accepted_answer_post_id' AND
+        WHERE tc.name = '#{::DiscourseSolved::ACCEPTED_ANSWER_POST_ID_CUSTOM_FIELD}' AND
                         tc.value IS NOT NULL
         )",
       )
@@ -558,7 +582,7 @@ SQL
         "topics.id NOT IN (
         SELECT tc.topic_id
         FROM topic_custom_fields tc
-        WHERE tc.name = 'accepted_answer_post_id' AND
+        WHERE tc.name = '#{::DiscourseSolved::ACCEPTED_ANSWER_POST_ID_CUSTOM_FIELD}' AND
                         tc.value IS NOT NULL
         )",
       )
@@ -575,7 +599,7 @@ SQL
             "topics.id IN (
           SELECT tc.topic_id
           FROM topic_custom_fields tc
-          WHERE tc.name = 'accepted_answer_post_id' AND
+          WHERE tc.name = '#{::DiscourseSolved::ACCEPTED_ANSWER_POST_ID_CUSTOM_FIELD}' AND
                           tc.value IS NOT NULL
           )",
           )
@@ -585,7 +609,7 @@ SQL
             "topics.id NOT IN (
           SELECT tc.topic_id
           FROM topic_custom_fields tc
-          WHERE tc.name = 'accepted_answer_post_id' AND
+          WHERE tc.name = '#{::DiscourseSolved::ACCEPTED_ANSWER_POST_ID_CUSTOM_FIELD}' AND
                           tc.value IS NOT NULL
           )",
           )
@@ -620,13 +644,13 @@ SQL
   end
 
   if TopicList.respond_to? :preloaded_custom_fields
-    TopicList.preloaded_custom_fields << "accepted_answer_post_id"
+    TopicList.preloaded_custom_fields << ::DiscourseSolved::ACCEPTED_ANSWER_POST_ID_CUSTOM_FIELD
   end
   if Site.respond_to? :preloaded_category_custom_fields
     Site.preloaded_category_custom_fields << "enable_accepted_answers"
   end
   if Search.respond_to? :preloaded_topic_custom_fields
-    Search.preloaded_topic_custom_fields << "accepted_answer_post_id"
+    Search.preloaded_topic_custom_fields << ::DiscourseSolved::ACCEPTED_ANSWER_POST_ID_CUSTOM_FIELD
   end
 
   if CategoryList.respond_to?(:preloaded_topic_custom_fields)
@@ -637,7 +661,7 @@ SQL
         NOT EXISTS(
           SELECT 1 FROM topic_custom_fields
           WHERE topic_id = topics.id
-          AND name = 'accepted_answer_post_id'
+          AND name = '#{::DiscourseSolved::ACCEPTED_ANSWER_POST_ID_CUSTOM_FIELD}'
           AND value IS NOT NULL
         )
       SQL
@@ -722,7 +746,7 @@ SQL
   add_to_class(:composer_messages_finder, :check_topic_is_solved) do
     return if !SiteSetting.solved_enabled || SiteSetting.disable_solved_education_message
     return if !replying? || @topic.blank? || @topic.private_message?
-    return if @topic.custom_fields["accepted_answer_post_id"].blank?
+    return if @topic.custom_fields[::DiscourseSolved::ACCEPTED_ANSWER_POST_ID_CUSTOM_FIELD].blank?
 
     {
       id: "solved_topic",
@@ -749,7 +773,7 @@ SQL
       answer_post_ids =
         TopicCustomField
           .select("value::INTEGER")
-          .where(name: "accepted_answer_post_id")
+          .where(name: ::DiscourseSolved::ACCEPTED_ANSWER_POST_ID_CUSTOM_FIELD)
           .where(topic_id: topics.map(&:id))
       answer_user_ids = Post.where(id: answer_post_ids).pluck(:topic_id, :user_id).to_h
       topics.each { |topic| topic.accepted_answer_user_id = answer_user_ids[topic.id] }

spec/integration/solved_spec.rb

@@ -9,6 +9,38 @@ RSpec.describe "Managing Posts solved status" do
 
   before { SiteSetting.allow_solved_on_all_topics = true }
 
+  describe "search" do
+    before { SearchIndexer.enable }
+
+    after { SearchIndexer.disable }
+
+    it "can prioritize solved topics in search" do
+      normal_post =
+        Fabricate(
+          :post,
+          raw: "My reply carrot",
+          topic: Fabricate(:topic, title: "A topic that is not solved but open"),
+        )
+
+      solved_post =
+        Fabricate(
+          :post,
+          raw: "My solution carrot",
+          topic: Fabricate(:topic, title: "A topic that will be closed", closed: true),
+        )
+
+      DiscourseSolved.accept_answer!(solved_post, Discourse.system_user)
+
+      result = Search.execute("carrot")
+      expect(result.posts.pluck(:id)).to eq([normal_post.id, solved_post.id])
+
+      SiteSetting.prioritize_solved_topics_in_search = true
+
+      result = Search.execute("carrot")
+      expect(result.posts.pluck(:id)).to eq([solved_post.id, normal_post.id])
+    end
+  end
+
   describe "auto bump" do
     it "does not automatically bump solved topics" do
       category = Fabricate(:category_with_definition)