Implement forum topic voting and tag change pruning (#3580)

app/logical/daily_maintenance.rb

@@ -5,6 +5,7 @@ class DailyMaintenance
     TagPruner.new.prune!
     Upload.where('created_at < ?', 1.day.ago).delete_all
     Delayed::Job.where('created_at < ?', 45.days.ago).delete_all
+    #ForumPostVote.where("created_at < ?", 90.days.ago).delete_all
     PostVote.prune!
     CommentVote.prune!
     ApiCacheGenerator.new.generate_tag_cache
@@ -15,5 +16,7 @@ class DailyMaintenance
     Tag.clean_up_negative_post_counts!
     SuperVoter.init!
     TokenBucket.prune!
+    TagChangeRequestPruner.warn_all
+    TagChangeRequestPruner.reject_all
   end
 end

app/logical/session_loader.rb

@@ -79,7 +79,8 @@ private
   end
 
   def load_session_user
-    CurrentUser.user = User.find_by_id(session[:user_id])
+    user = User.find_by_id(session[:user_id])
+    CurrentUser.user = user if user
   end
 
   def load_cookie_user

app/logical/tag_change_request_pruner.rb

@@ -0,0 +1,43 @@
+# Service to prune old unapproved tag change requests
+# (including tag aliases, tag implications, and bulk
+# update requests).
+
+class TagChangeRequestPruner
+  def self.warn_all
+    [TagAlias, TagImplication, BulkUpdateRequest].each do |model|
+      new.warn_old(model)
+    end
+  end
+
+  def self.reject_all
+    [TagAlias, TagImplication, BulkUpdateRequest].each do |model|
+      new.reject_expired(model)
+    end
+  end
+
+  def warn_old(model)
+    model.old.pending.find_each do |tag_change|
+      if tag_change.forum_topic
+        name = model.model_name.human.downcase
+        body = "This #{name} is pending automatic rejection in 5 days."
+        unless tag_change.forum_topic.posts.where(creator_id: User.system.id, body: body).exists?
+          tag_change.forum_updater.update(body)
+        end
+      end
+    end
+  end
+
+  def reject_expired(model)
+    model.expired.pending.find_each do |tag_change|
+      if tag_change.forum_topic
+        name = model.model_name.human.downcase
+        body = "This #{name} has been rejected because it was not approved within 60 days."
+        tag_change.forum_updater.update(body)
+      end
+
+      CurrentUser.as_system do
+        tag_change.reject!
+      end
+    end
+  end
+end