discourse/app/models/quoted_post.rb

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# frozen_string_literal: true
class QuotedPost < ActiveRecord::Base
belongs_to :post
belongs_to :quoted_post, class_name: 'Post'
# NOTE we already have a path that does this for topic links,
# however topic links exclude quotes and links within a topic
# we are double parsing this fragment, this may be worth optimising later
def self.extract_from(post)
doc = Nokogiri::HTML.fragment(post.cooked)
uniq = {}
doc.css("aside.quote[data-topic]").each do |a|
topic_id = a['data-topic'].to_i
post_number = a['data-post'].to_i
next if topic_id == 0 || post_number == 0
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next if uniq[[topic_id, post_number]]
next if post.topic_id == topic_id && post.post_number == post_number
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uniq[[topic_id, post_number]] = true
end
if uniq.length == 0
DB.exec("DELETE FROM quoted_posts WHERE post_id = :post_id", post_id: post.id)
else
args = {
post_id: post.id,
topic_ids: uniq.keys.map(&:first),
post_numbers: uniq.keys.map(&:second)
}
DB.exec(<<~SQL, args)
INSERT INTO quoted_posts (post_id, quoted_post_id, created_at, updated_at)
SELECT :post_id, p.id, current_timestamp, current_timestamp
FROM posts p
JOIN (
SELECT
unnest(ARRAY[:topic_ids]) topic_id,
unnest(ARRAY[:post_numbers]) post_number
) X ON X.topic_id = p.topic_id AND X.post_number = p.post_number
LEFT JOIN quoted_posts q on q.post_id = :post_id AND q.quoted_post_id = p.id
WHERE q.id IS NULL
SQL
DB.exec(<<~SQL, args)
DELETE FROM quoted_posts
WHERE post_id = :post_id
AND id IN (
SELECT q1.id FROM quoted_posts q1
LEFT JOIN posts p1 ON p1.id = q1.quoted_post_id
LEFT JOIN (
SELECT
unnest(ARRAY[:topic_ids]) topic_id,
unnest(ARRAY[:post_numbers]) post_number
) X on X.topic_id = p1.topic_id AND X.post_number = p1.post_number
WHERE q1.post_id = :post_id AND X.topic_id IS NULL
)
SQL
end
# simplest place to add this code
reply_quoted = false
if post.reply_to_post_number
reply_post_id = Post.where(topic_id: post.topic_id, post_number: post.reply_to_post_number).pluck_first(:id)
reply_quoted = reply_post_id.present? && QuotedPost.where(post_id: post.id, quoted_post_id: reply_post_id).count > 0
end
if reply_quoted != post.reply_quoted
post.update_columns(reply_quoted: reply_quoted)
end
end
end
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# == Schema Information
#
# Table name: quoted_posts
#
# id :integer not null, primary key
# post_id :integer not null
# quoted_post_id :integer not null
# created_at :datetime not null
# updated_at :datetime not null
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#
# Indexes
#
# index_quoted_posts_on_post_id_and_quoted_post_id (post_id,quoted_post_id) UNIQUE
# index_quoted_posts_on_quoted_post_id_and_post_id (quoted_post_id,post_id) UNIQUE
#