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Improve performance of account_media_status_ids #6729

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merged 1 commit into from Mar 10, 2018
Merged

Improve performance of account_media_status_ids #6729

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8 changes: 7 additions & 1 deletion app/controllers/api/v1/accounts/statuses_controller.rb
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Expand Up @@ -51,7 +51,13 @@ def only_media_scope
end

def account_media_status_ids
@account.media_attachments.attached.reorder(nil).select(:status_id).distinct
# `SELECT DISTINCT id, updated_at` is too slow, so pluck ids at first, and then select id, updated_at with ids.
# Also, Avoid getting slow by not narrowing down by `statuses.account_id`.
# When narrowing down by `statuses.account_id`, `index_statuses_20180106` will be used
# and the table will be joined by `Merge Semi Join`, so the query will be slow.
Status.joins(:media_attachments).merge(@account.media_attachments).permitted_for(@account, current_account)
.paginate_by_max_id(limit_param(DEFAULT_STATUSES_LIMIT), params[:max_id], params[:since_id])
.reorder(id: :desc).distinct(:id).pluck(:id)
end

def pinned_scope
Expand Down