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PERF: turn 3 queries into 1

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Sam 2015-09-10 17:07:20 +10:00
parent 0b9322d16a
commit c845fcb154
1 changed files with 15 additions and 6 deletions
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21
app/models/user_action.rb
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@ -79,12 +79,21 @@ SQL
def self.private_messages_stats(user_id, guardian)
return unless guardian.can_see_private_messages?(user_id)
# list the stats for: all/mine/unread (topic-based)
private_messages = Topic.where("topics.id IN (SELECT topic_id FROM topic_allowed_users WHERE user_id = #{user_id})")
.joins("LEFT OUTER JOIN topic_users AS tu ON (topics.id = tu.topic_id AND tu.user_id = #{user_id})")
.private_messages
all = private_messages.count
mine = private_messages.where(user_id: user_id).count
unread = private_messages.where("tu.last_read_post_number IS NULL OR tu.last_read_post_number < topics.highest_post_number").count
sql = <<SQL
SELECT COUNT(*) "all",
SUM(CASE WHEN t.user_id = :user_id THEN 1 ELSE 0 END) mine,
SUM(CASE WHEN tu.last_read_post_number IS NULL OR tu.last_read_post_number < t.highest_post_number THEN 1 ELSE 0 END) unread
FROM topics t
LEFT JOIN topic_users tu ON t.id = tu.topic_id AND tu.user_id = :user_id
WHERE t.deleted_at IS NULL AND
t.id IN (SELECT topic_id FROM topic_allowed_users WHERE user_id = :user_id) AND
t.archetype = 'private_message'
SQL
all,mine,unread = exec_sql(sql, user_id: user_id).values[0].map(&:to_i)
{ all: all, mine: mine, unread: unread }
end