discourse/db/migrate/20130404232558_add_user_ext...

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class AddUserExtras < ActiveRecord::Migration[4.2]
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