Preloading and missing validation

app/models/discourse_solved/solved_topic.rb

@@ -11,6 +11,7 @@ module DiscourseSolved
 
     validates :topic_id, presence: true
     validates :answer_post_id, presence: true
+    validates :accepter_user_id, presence: true
   end
 end
 

db/migrate/20250318024953_copy_solved_topic_custom_field_to_discourse_solved_solved_topics.rb

@@ -30,7 +30,7 @@ class CopySolvedTopicCustomFieldToDiscourseSolvedSolvedTopics < ActiveRecord::Mi
           AND tc2.name = 'solved_auto_close_topic_timer_id'
         LEFT JOIN user_actions ua
           ON ua.target_topic_id = tc.topic_id
-          AND ua.action_type = #{UserAction::SOLVED}
+          AND ua.action_type = 15
         WHERE tc.name = 'accepted_answer_post_id'
           AND tc.id > :last_id
         ORDER BY tc.topic_id, ua.created_at DESC

db/migrate/20250318025147_add_index_for_discourse_solved_topics.rb

@@ -7,10 +7,12 @@ class AddIndexForDiscourseSolvedTopics < ActiveRecord::Migration[7.2]
     remove_index :discourse_solved_solved_topics,
                  :topic_id,
                  algorithm: :concurrently,
+                 unique: true,
                  if_exists: true
     remove_index :discourse_solved_solved_topics,
                  :answer_post_id,
                  algorithm: :concurrently,
+                 unique: true,
                  if_exists: true
 
     add_index :discourse_solved_solved_topics, :topic_id, unique: true, algorithm: :concurrently

lib/discourse_assign/entry_point.rb

@@ -8,9 +8,7 @@ module DiscourseAssign
     def self.inject(plugin)
       plugin.register_modifier(:assigns_reminder_assigned_topics_query) do |query|
         next query if !SiteSetting.ignore_solved_topics_in_assigned_reminder
-        # TODO: this line was modified for the custom fields migration,
-        # but returning this huge array is not good at all.
-        query.where.not(id: DiscourseSolved::SolvedTopic.pluck(:topic_id))
+        query.where.not(id: DiscourseSolved::SolvedTopic.select(:topic_id))
       end
 
       plugin.register_modifier(:assigned_count_for_user_query) do |query, user|

plugin.rb

@@ -19,11 +19,6 @@ register_asset "stylesheets/mobile/solutions.scss", :mobile
 module ::DiscourseSolved
   PLUGIN_NAME = "discourse-solved"
   ENABLE_ACCEPTED_ANSWERS_CUSTOM_FIELD = "enable_accepted_answers"
-
-  # throw these
-  AUTO_CLOSE_TOPIC_TIMER_CUSTOM_FIELD = "solved_auto_close_topic_timer_id"
-  ACCEPTED_ANSWER_POST_ID_CUSTOM_FIELD = "accepted_answer_post_id"
-  IS_ACCEPTED_ANSWER_CUSTOM_FIELD = "is_accepted_answer"
 end
 
 require_relative "lib/discourse_solved/engine.rb"
@@ -170,13 +165,18 @@ after_initialize do
   end
 
   # TODO: Preload fields in
-  # - TopicList - answer_post_id
-  # - Search - answer_post_id
   # - CategoryList - answer_post_id ?? for what
-  # topic_view_post_custom_fields_allowlister { [::DiscourseSolved::IS_ACCEPTED_ANSWER_CUSTOM_FIELD] }
-  # TopicList.preloaded_custom_fields << ::DiscourseSolved::ACCEPTED_ANSWER_POST_ID_CUSTOM_FIELD
-  # Search.preloaded_topic_custom_fields << ::DiscourseSolved::ACCEPTED_ANSWER_POST_ID_CUSTOM_FIELD
   # CategoryList.preloaded_topic_custom_fields << ::DiscourseSolved::ACCEPTED_ANSWER_POST_ID_CUSTOM_FIELD
+
+  # - TopicList - answer_post_id
+  register_category_list_topics_preloader_associations(:solved) if SiteSetting.solved_enabled
+  register_topic_preloader_associations(:solved) if SiteSetting.solved_enabled
+
+  # - Search - answer_post_id
+  Search.on_preload do |results|
+    next unless SiteSetting.solved_enabled
+    results.posts = results.posts.includes(topic: :solved)
+  end
   Site.preloaded_category_custom_fields << ::DiscourseSolved::ENABLE_ACCEPTED_ANSWERS_CUSTOM_FIELD
 
   add_api_key_scope(