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PERF: Use joins for Post.for_mailing_list instead of NOT IN.

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Joining on the topics table and then filtering the topics against a large set of
ids is so much slower than doing a join on a sub query.
This commit is contained in:
Guo Xiang Tan 2019-04-06 07:55:24 +08:00
parent 84eb9bc1c9
commit 6525613b89
1 changed files with 5 additions and 4 deletions
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9
app/models/post.rb
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@ -86,15 +86,16 @@ class Post < ActiveRecord::Base
scope :with_topic_subtype, ->(subtype) { joins(:topic).where('topics.subtype = ?', subtype) }
scope :visible, -> { joins(:topic).where('topics.visible = true').where(hidden: false) }
scope :secured, -> (guardian) { where('posts.post_type IN (?)', Topic.visible_post_types(guardian&.user)) }
scope :for_mailing_list, ->(user, since) {
q = created_since(since)
.joins(:topic)
.where(topic: Topic.for_digest(user, Time.at(0))) # we want all topics with new content, regardless when they were created
.joins("INNER JOIN (#{Topic.for_digest(user, Time.at(0)).select(:id).to_sql}) AS digest_topics ON digest_topics.id = posts.topic_id") # we want all topics with new content, regardless when they were created
.order('posts.created_at ASC')
q = q.where.not(post_type: Post.types[:whisper]) unless user.staff?
q.order('posts.created_at ASC')
q
}
scope :raw_match, -> (pattern, type = 'string') {
type = type&.downcase