jobs: migrate related tag updates to ActiveJob.

app/jobs/update_related_tags_job.rb

@@ -0,0 +1,7 @@
+class UpdateRelatedTagsJob < ApplicationJob
+  queue_as :default
+
+  def perform(tag)
+    tag.update_related
+  end
+end

app/models/tag.rb

@@ -872,7 +872,7 @@ class Tag < ApplicationRecord
 
       if Cache.get("urt:#{key}").nil? && should_update_related?
         if post_count < COSINE_SIMILARITY_RELATED_TAG_THRESHOLD
-          delay(:queue => "default").update_related
+          UpdateRelatedTagsJob.perform_later(self)
         else
           sqs = SqsService.new(Danbooru.config.aws_sqs_reltagcalc_url)
           sqs.send_message("calculate #{name}")

test/unit/tag_test.rb

@@ -283,4 +283,15 @@ class TagTest < ActiveSupport::TestCase
       assert_equal(1, tag.reload.post_count)
     end
   end
+
+  context "The #related_tag_array method" do
+    should "update the related tags" do
+      create(:post, tag_string: "bkub")
+      tag = Tag.find_by_name("bkub")
+
+      assert_nil(tag.related_tags)
+      perform_enqueued_jobs { tag.related_tag_array }
+      assert_equal([["bkub", "1"]], tag.reload.related_tag_array)
+    end
+  end
 end