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Optimize Status#permitted_for 500x (account timeline) (#5373) 

The main change of this PR is removing `order by visibility` hack.

This was introduced to force using of `index_statuses_on_account_id` instead of PK index, but it seems no longer needed probably due to `index_statuses_on_account_id_id`. Removing this avoids reading all rows, so really improves first fetching of the user who has lot of statuses.

I have also changed JOIN to IN + subquery, which slightly faster in most cases.
This commit is contained in:
unarist 2017-10-13 23:53:44 +09:00 committed by Eugen Rochko
parent df7dbc41ae
commit a1c54220e8
1 changed files with 1 additions and 3 deletions
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4
app/models/status.rb
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@ -220,9 +220,7 @@ class Status < ApplicationRecord
# non-followers can see everything that isn't private/direct, but can see stuff they are mentioned in.
visibility.push(:private) if account.following?(target_account)
joins("LEFT OUTER JOIN mentions ON statuses.id = mentions.status_id AND mentions.account_id = #{account.id}")
.where(arel_table[:visibility].in(visibility).or(Mention.arel_table[:id].not_eq(nil)))
.order(visibility: :desc)
where(visibility: visibility).or(where(id: account.mentions.select(:status_id)))
end
end