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modqueue: avoid N+1 queries for disapprovals, uploaders.

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Fixes an N+1 queries problem in the /moderator/post/queue view by
prefetching disapprovals and uploaders.

Also the way disapproval messages were previously rendered triggered a bunch
of sql queries for each post:

    SELECT COUNT(*) FROM "post_disapprovals" WHERE "post_disapprovals"."post_id" = $1 [["post_id", 52]]
    SELECT COUNT(*) FROM "post_disapprovals" WHERE "post_disapprovals"."post_id" = $1 AND "post_disapprovals"."reason" = $2  [["post_id", 52], ["reason", "breaks_rules"]]
    SELECT COUNT(*) FROM "post_disapprovals" WHERE "post_disapprovals"."post_id" = $1 AND "post_disapprovals"."reason" = $2  [["post_id", 52], ["reason", "poor_quality"]]
    SELECT COUNT(*) FROM "post_disapprovals" WHERE "post_disapprovals"."post_id" = $1 AND "post_disapprovals"."reason" IN ('disinterest', 'legacy')  [["post_id", 52]]
    SELECT COUNT(*) FROM "post_disapprovals" WHERE "post_disapprovals"."post_id" = $1 AND (message is not null and message <> '')  [["post_id", 52]]
    SELECT "post_disapprovals".* FROM "post_disapprovals" WHERE "post_disapprovals"."post_id" = $1 AND (message is not null and message <> '')  [["post_id", 52]]

This refactors to bring it down to one:

    SELECT "post_disapprovals".* FROM "post_disapprovals" WHERE "post_disapprovals"."post_id" = $1  [["post_id", 52]]
This commit is contained in:
evazion
2017-02-24 19:13:02 -06:00
parent 9b40016895
commit 83915a5d46
3 changed files with 19 additions and 19 deletions
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4
app/controllers/moderator/post/queues_controller.rb
View File

@@ -15,7 +15,7 @@ module Moderator
end
::Post.without_timeout do
@posts = ::Post.order("posts.id asc").pending_or_flagged.available_for_moderation(params[:hidden]).tag_match(params[:query]).paginate(params[:page], :limit => per_page)
@posts = ::Post.includes(:disapprovals, :uploader).order("posts.id asc").pending_or_flagged.available_for_moderation(params[:hidden]).tag_match(params[:query]).paginate(params[:page], :limit => per_page)
@posts.each # hack to force rails to eager load
end
respond_with(@posts)
@@ -25,7 +25,7 @@ module Moderator
cookies.permanent[:moderated] = Time.now.to_i
::Post.without_timeout do
@posts = ::Post.order("posts.id asc").pending_or_flagged.available_for_moderation(false).reorder("random()").limit(RANDOM_COUNT)
@posts = ::Post.includes(:disapprovals, :uploader).order("posts.id asc").pending_or_flagged.available_for_moderation(false).reorder("random()").limit(RANDOM_COUNT)
@posts.each # hack to force rails to eager load
if @posts.empty?