get regular trust level going, self heal inconsistent topic timings

db/migrate/20130404232558_add_user_extras.rb

@@ -0,0 +1,70 @@
+class AddUserExtras < ActiveRecord::Migration
+  def up
+
+    # NOTE: our user table is getting bloated, we probably want to split it for performance
+    # put lesser used columns into a user_extras table and frequently used ones here.
+    add_column :users, :likes_given, :integer, null: false, default: 0
+    add_column :users, :likes_received, :integer, null: false, default: 0
+    add_column :users, :topic_reply_count, :integer, null: false, default: 0
+
+
+    # NOTE: to keep migrations working through refactorings we avoid externalizing this stuff.
+    #   even though a helper method may make sense
+    execute <<SQL
+UPDATE users u
+SET
+    likes_given = X.likes_given
+FROM (
+  SELECT
+    a.user_id,
+    COUNT(*) likes_given
+  FROM user_actions a
+  JOIN posts p ON p.id = a.target_post_id
+  WHERE p.deleted_at IS NULL AND a.action_type = 1
+  GROUP BY a.user_id
+) as X
+WHERE X.user_id = u.id
+SQL
+
+  execute <<SQL
+UPDATE users u
+SET
+    likes_received = Y.likes_received
+FROM (
+  SELECT
+    a.user_id,
+    COUNT(*) likes_received
+  FROM user_actions a
+  JOIN posts p ON p.id = a.target_post_id
+  WHERE p.deleted_at IS NULL AND a.action_type = 2
+  GROUP BY a.user_id
+) as Y
+WHERE Y.user_id = u.id
+SQL
+
+  execute <<SQL
+UPDATE users u
+SET
+    topic_reply_count = Z.topic_reply_count
+FROM (
+  SELECT
+    p.user_id,
+    COUNT(DISTINCT topic_id) topic_reply_count
+  FROM posts p
+  JOIN topics t on t.id = p.topic_id
+  WHERE t.user_id <> p.user_id AND
+        p.deleted_at IS NULL AND t.deleted_at IS NULL
+  GROUP BY p.user_id
+) Z
+WHERE
+  Z.user_id = u.id
+SQL
+
+  end
+
+  def down
+    remove_column :users, :likes_given
+    remove_column :users, :likes_received
+    remove_column :users, :topic_reply_count
+  end
+end