PERF: Tl3Promotions job can limit the number of TL3 candidates by using some simple requirements in the query

app/jobs/scheduled/tl3_promotions.rb

@@ -21,13 +21,22 @@ module Jobs
       end
 
       # Promotions
-      User.real.where(
-        trust_level: TrustLevel[2],
-        manual_locked_trust_level: nil,
-        group_locked_trust_level: nil
-      ).where.not(id: demoted_user_ids).find_each do |u|
+      User.real.not_suspended.where(
+          trust_level: TrustLevel[2],
+          manual_locked_trust_level: nil,
+          group_locked_trust_level: nil
+        ).where.not(id: demoted_user_ids)
+        .joins(:user_stat)
+        .where("user_stats.days_visited >= ?", SiteSetting.tl3_requires_days_visited)
+        .where("user_stats.topic_reply_count >= ?", SiteSetting.tl3_requires_topics_replied_to)
+        .where("user_stats.topics_entered >= ?", SiteSetting.tl3_requires_topics_viewed_all_time)
+        .where("user_stats.posts_read_count >= ?", SiteSetting.tl3_requires_posts_read_all_time)
+        .where("user_stats.likes_given >= ?", SiteSetting.tl3_requires_likes_given)
+        .where("user_stats.likes_received >= ?", SiteSetting.tl3_requires_likes_received)
+        .find_each do |u|
         Promotion.new(u).review_tl2
       end
+
     end
   end
 

spec/jobs/tl3_promotions_spec.rb

@@ -2,10 +2,23 @@ require 'rails_helper'
 
 describe Jobs::Tl3Promotions do
 
+  def create_qualifying_stats(user)
+    user.create_user_stat if user.user_stat.nil?
+    user.user_stat.update_attributes!(
+      days_visited: 1000,
+      topic_reply_count: 1000,
+      topics_entered: 1000,
+      posts_read_count: 1000,
+      likes_given: 1000,
+      likes_received: 1000
+    )
+  end
+
   subject(:run_job) { described_class.new.execute({}) }
 
   it "promotes tl2 user who qualifies for tl3" do
     _tl2_user = Fabricate(:user, trust_level: TrustLevel[2])
+    create_qualifying_stats(_tl2_user)
     TrustLevel3Requirements.any_instance.stubs(:requirements_met?).returns(true)
     Promotion.any_instance.expects(:change_trust_level!).with(TrustLevel[3], anything).once
     run_job
@@ -14,6 +27,8 @@ describe Jobs::Tl3Promotions do
   it "doesn't promote tl1 and tl0 users who have met tl3 requirements" do
     _tl1_user = Fabricate(:user, trust_level: TrustLevel[1])
     _tl0_user = Fabricate(:user, trust_level: TrustLevel[0])
+    create_qualifying_stats(_tl1_user)
+    create_qualifying_stats(_tl0_user)
     TrustLevel3Requirements.any_instance.expects(:requirements_met?).never
     Promotion.any_instance.expects(:change_trust_level!).never
     run_job