PERF: Add index to speed up User#number_of_flagged_posts.

On meta, we were seeing the query take almost 100ms.
This commit is contained in:
Guo Xiang Tan 2019-03-20 17:16:30 +08:00
parent 54d3648c55
commit f0f1e878fe

View File

@ -0,0 +1,6 @@
class AddIndexPostActionTypeIdDisagreedAtOnPostActions < ActiveRecord::Migration[5.2]
def change
add_index :post_actions, [:post_action_type_id, :disagreed_at],
where: "(disagreed_at IS NULL)"
end
end