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optimise view count calculation query

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This commit is contained in:
Sam 2013-10-02 17:08:53 +10:00
parent ee286cc270
commit 441010ac65
2 changed files with 13 additions and 5 deletions
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13
app/models/user.rb
View File

@ -329,12 +329,13 @@ class User < ActiveRecord::Base
(SELECT v.user_id,
COUNT(DISTINCT parent_id) AS c
FROM views AS v
WHERE parent_type = 'Topic'
WHERE parent_type = 'Topic' AND v.user_id IN (
SELECT u1.id FROM users u1 where u1.last_seen_at > :seen_at
)
GROUP BY v.user_id) AS X
WHERE
X.user_id = users.id AND
X.c <> topics_entered AND
users.last_seen_at > :seen_at
X.c <> topics_entered
", seen_at: 1.hour.ago
# Update denormalzied posts_read_count
@ -343,10 +344,12 @@ class User < ActiveRecord::Base
(SELECT pt.user_id,
COUNT(*) AS c
FROM post_timings AS pt
WHERE pt.user_id IN (
SELECT u1.id FROM users u1 where u1.last_seen_at > :seen_at
)
GROUP BY pt.user_id) AS X
WHERE X.user_id = users.id AND
X.c <> posts_read_count AND
users.last_seen_at > :seen_at
X.c <> posts_read_count
", seen_at: 1.hour.ago
end

5
db/migrate/20131002070347_add_user_id_parent_type_index_on_views.rb Normal file
View File

@ -0,0 +1,5 @@
class AddUserIdParentTypeIndexOnViews < ActiveRecord::Migration
def change
add_index :views, [:user_id,:parent_type,:parent_id]
end
end