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Code Issues Projects Releases Wiki Activity

Replace incorrect use of distinct with group (#14675)

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Some uses of ActiveRecord::QueryMethods#distinct pass field names but they
are incorrect for the current version of Rails.

ActiveRecord::QueryMethods#group provides the expected behavior and
benefits performance. See commit 6da24aad4cafdef8d8a2c92bac2002a5fc2fe9c8.
This commit is contained in:
Akihiko Odaki 2020-08-28 19:29:59 +09:00 committed by GitHub
parent 552e886b64
commit e26e7a1cb5
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2 changed files with 2 additions and 14 deletions
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12
app/controllers/api/v1/accounts/statuses_controller.rb
View File

@ -41,17 +41,7 @@ class Api::V1::Accounts::StatusesController < Api::BaseController
end
def only_media_scope
Status.where(id: account_media_status_ids)
end
def account_media_status_ids
# `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.
@account.statuses.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)
Status.joins(:media_attachments).merge(@account.media_attachments.reorder(nil)).group(:id)
end
def pinned_scope

4
app/controllers/api/v1/timelines/public_controller.rb
View File

@ -30,9 +30,7 @@ class Api::V1::Timelines::PublicController < Api::BaseController
)
if truthy_param?(:only_media)
# `SELECT DISTINCT id, updated_at` is too slow, so pluck ids at first, and then select id, updated_at with ids.
status_ids = statuses.joins(:media_attachments).distinct(:id).pluck(:id)
statuses.where(id: status_ids)
statuses.joins(:media_attachments).group(:id)
else
statuses
end