discourse/lib/search.rb

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# frozen_string_literal: true
class Search
DIACRITICS ||= /([\u0300-\u036f]|[\u1AB0-\u1AFF]|[\u1DC0-\u1DFF]|[\u20D0-\u20FF])/
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cattr_accessor :preloaded_topic_custom_fields
self.preloaded_topic_custom_fields = Set.new
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def self.per_facet
5
end
def self.strip_diacritics(str)
s = str.unicode_normalize(:nfkd)
s.gsub!(DIACRITICS, "")
s.strip!
s
end
def self.per_filter
50
end
# Sometimes we want more topics than are returned due to exclusion of dupes. This is the
# factor of extra results we'll ask for.
def self.burst_factor
3
end
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def self.facets
%w(topic category user private_messages tags all_topics)
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end
def self.ts_config(locale = SiteSetting.default_locale)
# if adding a text search configuration, you should check PG beforehand:
# SELECT cfgname FROM pg_ts_config;
# As an aside, dictionaries can be listed by `\dFd`, the
# physical locations are in /usr/share/postgresql/<version>/tsearch_data.
# But it may not appear there based on pg extension configuration.
# base docker config
#
case locale.split("_")[0].to_sym
when :da then 'danish'
when :nl then 'dutch'
when :en then 'english'
when :fi then 'finnish'
when :fr then 'french'
when :de then 'german'
when :hu then 'hungarian'
when :it then 'italian'
when :nb then 'norwegian'
when :pt then 'portuguese'
when :ro then 'romanian'
when :ru then 'russian'
when :es then 'spanish'
when :sv then 'swedish'
when :tr then 'turkish'
else 'simple' # use the 'simple' stemmer for other languages
end
end
def self.prepare_data(search_data, purpose = :query)
purpose ||= :query
data = search_data.dup
data.force_encoding("UTF-8")
if purpose != :topic
# TODO cppjieba_rb is designed for chinese, we need something else for Japanese
# Korean appears to be safe cause words are already space seperated
# For Japanese we should investigate using kakasi
if ['zh_TW', 'zh_CN', 'ja'].include?(SiteSetting.default_locale) || SiteSetting.search_tokenize_chinese_japanese_korean
require 'cppjieba_rb' unless defined? CppjiebaRb
mode = (purpose == :query ? :query : :mix)
data = CppjiebaRb.segment(search_data, mode: mode)
data = CppjiebaRb.filter_stop_word(data).join(' ')
else
data.squish!
end
if SiteSetting.search_ignore_accents
data = strip_diacritics(data)
end
end
data
end
def self.word_to_date(str)
if str =~ /^[0-9]{1,3}$/
return Time.zone.now.beginning_of_day.days_ago(str.to_i)
end
if str =~ /^([12][0-9]{3})(-([0-1]?[0-9]))?(-([0-3]?[0-9]))?$/
year = $1.to_i
month = $2 ? $3.to_i : 1
day = $4 ? $5.to_i : 1
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return if day == 0 || month == 0 || day > 31 || month > 12
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return begin
Time.zone.parse("#{year}-#{month}-#{day}")
rescue ArgumentError
end
end
if str.downcase == "yesterday"
return Time.zone.now.beginning_of_day.yesterday
end
titlecase = str.downcase.titlecase
if Date::DAYNAMES.include?(titlecase)
return Time.zone.now.beginning_of_week(str.downcase.to_sym)
end
if idx = (Date::MONTHNAMES.find_index(titlecase) ||
Date::ABBR_MONTHNAMES.find_index(titlecase))
delta = Time.zone.now.month - idx
delta += 12 if delta < 0
Time.zone.now.beginning_of_month.months_ago(delta)
end
end
def self.min_post_id_no_cache
return 0 unless SiteSetting.search_prefer_recent_posts?
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offset, has_more = Post.unscoped
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.order('id desc')
.offset(SiteSetting.search_recent_posts_size - 1)
.limit(2)
.pluck(:id)
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has_more ? offset : 0
end
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def self.min_post_id(opts = nil)
return 0 unless SiteSetting.search_prefer_recent_posts?
# It can be quite slow to count all the posts so let's cache it
Discourse.cache.fetch("search-min-post-id:#{SiteSetting.search_recent_posts_size}", expires_in: 1.week) do
min_post_id_no_cache
end
end
attr_accessor :term
attr_reader :clean_term
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def initialize(term, opts = nil)
@opts = opts || {}
@guardian = @opts[:guardian] || Guardian.new
@search_context = @opts[:search_context]
@include_blurbs = @opts[:include_blurbs] || false
@blurb_length = @opts[:blurb_length]
@valid = true
@page = @opts[:page]
term = term.to_s.dup
# Removes any zero-width characters from search terms
term.gsub!(/[\u200B-\u200D\uFEFF]/, '')
# Replace curly quotes to regular quotes
term.gsub!(/[\u201c\u201d]/, '"')
@clean_term = term
@in_title = false
term = process_advanced_search!(term)
if term.present?
@term = Search.prepare_data(term, Topic === @search_context ? :topic : nil)
@original_term = PG::Connection.escape_string(@term)
end
if @search_pms && @guardian.user
@opts[:type_filter] = "private_messages"
@search_context = @guardian.user
end
if @search_all_topics && @guardian.user
@opts[:type_filter] = "all_topics"
end
@results = GroupedSearchResults.new(
@opts[:type_filter],
clean_term,
@search_context,
@include_blurbs,
@blurb_length
)
end
def limit
if @opts[:type_filter].present?
Search.per_filter + 1
else
Search.per_facet + 1
end
end
def offset
if @page && @opts[:type_filter].present?
(@page - 1) * Search.per_filter
else
0
end
end
def valid?
@valid
end
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def self.execute(term, opts = nil)
self.new(term, opts).execute
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end
# Query a term
def execute
if SiteSetting.log_search_queries? && @opts[:search_type].present? && !Discourse.readonly_mode?
status, search_log_id = SearchLog.log(
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term: @term,
search_type: @opts[:search_type],
ip_address: @opts[:ip_address],
user_id: @opts[:user_id]
)
@results.search_log_id = search_log_id unless status == :error
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end
unless @filters.present? || @opts[:search_for_id]
min_length = @opts[:min_search_term_length] || SiteSetting.min_search_term_length
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terms = (@term || '').split(/\s(?=(?:[^"]|"[^"]*")*$)/).reject { |t| t.length < min_length }
if terms.blank?
@term = ''
@valid = false
return
end
end
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# If the term is a number or url to a topic, just include that topic
if @opts[:search_for_id] && ['topic', 'private_messages', 'all_topics'].include?(@results.type_filter)
if @term =~ /^\d+$/
single_topic(@term.to_i)
else
begin
route = Rails.application.routes.recognize_path(@term)
single_topic(route[:topic_id]) if route[:topic_id].present?
rescue ActionController::RoutingError
end
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end
end
find_grouped_results if @results.posts.blank?
if preloaded_topic_custom_fields.present? && @results.posts.present?
topics = @results.posts.map(&:topic)
Topic.preload_custom_fields(topics, preloaded_topic_custom_fields)
end
@results
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end
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def self.advanced_filter(trigger, &block)
(@advanced_filters ||= {})[trigger] = block
end
def self.advanced_filters
@advanced_filters
end
advanced_filter(/^in:personal-direct$/) do |posts|
if @guardian.user
posts
.joins("LEFT JOIN topic_allowed_groups tg ON posts.topic_id = tg.topic_id")
.where(<<~SQL, user_id: @guardian.user.id)
tg.id IS NULL
AND posts.topic_id IN (
SELECT tau.topic_id
FROM topic_allowed_users tau
JOIN topic_allowed_users tau2
ON tau2.topic_id = tau.topic_id
AND tau2.id != tau.id
WHERE tau.user_id = :user_id
GROUP BY tau.topic_id
HAVING COUNT(*) = 1
)
SQL
end
end
advanced_filter(/^in:tagged$/) do |posts|
posts
.where('EXISTS (SELECT 1 FROM topic_tags WHERE topic_tags.topic_id = posts.topic_id)')
end
advanced_filter(/^in:untagged$/) do |posts|
posts
.joins("LEFT JOIN topic_tags ON
topic_tags.topic_id = posts.topic_id")
.where("topic_tags.id IS NULL")
end
advanced_filter(/^status:open$/) do |posts|
posts.where('NOT topics.closed AND NOT topics.archived')
end
advanced_filter(/^status:closed$/) do |posts|
posts.where('topics.closed')
end
advanced_filter(/^status:public$/) do |posts|
category_ids = Category
.where(read_restricted: false)
.pluck(:id)
posts.where("topics.category_id in (?)", category_ids)
end
advanced_filter(/^status:archived$/) do |posts|
posts.where('topics.archived')
end
advanced_filter(/^status:noreplies$/) do |posts|
posts.where("topics.posts_count = 1")
end
advanced_filter(/^status:single_user$/) do |posts|
posts.where("topics.participant_count = 1")
end
advanced_filter(/^posts_count:(\d+)$/) do |posts, match|
posts.where("topics.posts_count = ?", match.to_i)
end
advanced_filter(/^min_post_count:(\d+)$/) do |posts, match|
posts.where("topics.posts_count >= ?", match.to_i)
end
advanced_filter(/^in:first|^f$/) do |posts|
posts.where("posts.post_number = 1")
end
advanced_filter(/^in:pinned$/) do |posts|
posts.where("topics.pinned_at IS NOT NULL")
end
advanced_filter(/^in:unpinned$/) do |posts|
if @guardian.user
posts.where("topics.pinned_at IS NOT NULL AND topics.id IN (
SELECT topic_id FROM topic_users WHERE user_id = ? AND cleared_pinned_at IS NOT NULL
)", @guardian.user.id)
end
end
advanced_filter(/^in:wiki$/) do |posts, match|
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posts.where(wiki: true)
end
advanced_filter(/^badge:(.*)$/) do |posts, match|
badge_id = Badge.where('name ilike ? OR id = ?', match, match.to_i).pluck_first(:id)
if badge_id
posts.where('posts.user_id IN (SELECT ub.user_id FROM user_badges ub WHERE ub.badge_id = ?)', badge_id)
else
posts.where("1 = 0")
end
end
def post_action_type_filter(posts, post_action_type)
posts.where("posts.id IN (
SELECT pa.post_id FROM post_actions pa
WHERE pa.user_id = #{@guardian.user.id} AND
pa.post_action_type_id = #{post_action_type} AND
deleted_at IS NULL
)")
end
advanced_filter(/^in:(likes)$/) do |posts, match|
if @guardian.user
post_action_type_filter(posts, PostActionType.types[:like])
end
end
advanced_filter(/^in:(bookmarks)$/) do |posts, match|
if @guardian.user
if SiteSetting.enable_bookmarks_with_reminders
posts.where("posts.id IN (SELECT post_id FROM bookmarks WHERE bookmarks.user_id = #{@guardian.user.id})")
else
post_action_type_filter(posts, PostActionType.types[:bookmark])
end
end
end
advanced_filter(/^in:posted$/) do |posts|
posts.where("posts.user_id = #{@guardian.user.id}") if @guardian.user
end
advanced_filter(/^in:created$/) do |posts|
posts.where(user_id: @guardian.user.id, post_number: 1) if @guardian.user
end
advanced_filter(/^created:@(.*)$/) do |posts, match|
user_id = User.where(username: match.downcase).pluck_first(:id)
posts.where(user_id: user_id, post_number: 1)
end
advanced_filter(/^in:(watching|tracking)$/) do |posts, match|
if @guardian.user
level = TopicUser.notification_levels[match.to_sym]
posts.where("posts.topic_id IN (
SELECT tu.topic_id FROM topic_users tu
WHERE tu.user_id = :user_id AND
tu.notification_level >= :level
)", user_id: @guardian.user.id, level: level)
end
end
advanced_filter(/^in:seen$/) do |posts|
if @guardian.user
posts
.joins("INNER JOIN post_timings ON
post_timings.topic_id = posts.topic_id
AND post_timings.post_number = posts.post_number
AND post_timings.user_id = #{ActiveRecord::Base.connection.quote(@guardian.user.id)}
")
end
end
advanced_filter(/^in:unseen$/) do |posts|
if @guardian.user
posts
.joins("LEFT JOIN post_timings ON
post_timings.topic_id = posts.topic_id
AND post_timings.post_number = posts.post_number
AND post_timings.user_id = #{ActiveRecord::Base.connection.quote(@guardian.user.id)}
")
.where("post_timings.user_id IS NULL")
end
end
advanced_filter(/^with:images$/) do |posts|
posts.where("posts.image_url IS NOT NULL")
end
advanced_filter(/^category:(.+)$/) do |posts, match|
exact = false
if match[0] == "="
exact = true
match = match[1..-1]
end
category_ids = Category.where('slug ilike ? OR name ilike ? OR id = ?',
match, match, match.to_i).pluck(:id)
if category_ids.present?
unless exact
category_ids +=
Category.where('parent_category_id = ?', category_ids.first).pluck(:id)
end
@category_filter_matched ||= true
posts.where("topics.category_id IN (?)", category_ids)
else
posts.where("1 = 0")
end
end
advanced_filter(/^\#([\p{L}0-9\-:=]+)$/) do |posts, match|
exact = true
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category_slug, subcategory_slug = match.to_s.split(":")
next unless category_slug
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if subcategory_slug
category_id, _ = DB.query_single(<<~SQL, category_slug.downcase, subcategory_slug.downcase)
SELECT sub.id
FROM categories sub
JOIN categories c ON sub.parent_category_id = c.id
WHERE LOWER(c.slug) = ? AND LOWER(sub.slug) = ?
ORDER BY c.id
LIMIT 1
SQL
else
# main category
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if category_slug[0] == "="
category_slug = category_slug[1..-1]
else
exact = false
end
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category_id = Category.where("lower(slug) = ?", category_slug.downcase)
.order('case when parent_category_id is null then 0 else 1 end')
.pluck(:id)
.first
end
if category_id
category_ids = [category_id]
unless exact
category_ids +=
Category.where('parent_category_id = ?', category_id).pluck(:id)
end
@category_filter_matched ||= true
posts.where("topics.category_id IN (?)", category_ids)
else
# try a possible tag match
tag_id = Tag.where_name(category_slug).pluck_first(:id)
if (tag_id)
posts.where(<<~SQL, tag_id)
topics.id IN (
SELECT DISTINCT(tt.topic_id)
FROM topic_tags tt
WHERE tt.tag_id = ?
)
SQL
else
if tag_group_id = TagGroup.find_id_by_slug(category_slug)
posts.where(<<~SQL, tag_group_id)
topics.id IN (
SELECT DISTINCT(tt.topic_id)
FROM topic_tags tt
WHERE tt.tag_id in (
SELECT tag_id
FROM tag_group_memberships
WHERE tag_group_id = ?
)
)
SQL
# a bit yucky but we got to add the term back in
elsif match.to_s.length >= SiteSetting.min_search_term_length
posts.where <<~SQL
posts.id IN (
SELECT post_id FROM post_search_data pd1
WHERE pd1.search_data @@ #{Search.ts_query(term: "##{match}")})
SQL
end
end
end
end
advanced_filter(/^group:(.+)$/) do |posts, match|
group_id = Group.where('name ilike ? OR (id = ? AND id > 0)', match, match.to_i).pluck_first(:id)
if group_id
posts.where("posts.user_id IN (select gu.user_id from group_users gu where gu.group_id = ?)", group_id)
else
posts.where("1 = 0")
end
end
advanced_filter(/^user:(.+)$/) do |posts, match|
user_id = User.where(staged: false).where('username_lower = ? OR id = ?', match.downcase, match.to_i).pluck_first(:id)
if user_id
posts.where("posts.user_id = #{user_id}")
else
posts.where("1 = 0")
end
end
advanced_filter(/^\@([a-zA-Z0-9_\-.]+)$/) do |posts, match|
user_id = User.where(staged: false).where(username_lower: match.downcase).pluck_first(:id)
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if user_id
posts.where("posts.user_id = #{user_id}")
else
posts.where("1 = 0")
end
end
advanced_filter(/^before:(.*)$/) do |posts, match|
if date = Search.word_to_date(match)
posts.where("posts.created_at < ?", date)
else
posts
end
end
advanced_filter(/^after:(.*)$/) do |posts, match|
if date = Search.word_to_date(match)
posts.where("posts.created_at > ?", date)
else
posts
end
end
advanced_filter(/^tags?:([\p{L}0-9,\-_+]+)$/) do |posts, match|
search_tags(posts, match, positive: true)
end
advanced_filter(/^\-tags?:([\p{L}0-9,\-_+]+)$/) do |posts, match|
search_tags(posts, match, positive: false)
end
advanced_filter(/^filetypes?:([a-zA-Z0-9,\-_]+)$/) do |posts, match|
file_extensions = match.split(",").map(&:downcase)
posts.where("posts.id IN (
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SELECT post_id
FROM topic_links
WHERE extension IN (:file_extensions)
UNION
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SELECT post_uploads.post_id
FROM uploads
JOIN post_uploads ON post_uploads.upload_id = uploads.id
WHERE lower(uploads.extension) IN (:file_extensions)
)", file_extensions: file_extensions)
end
private
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def search_tags(posts, match, positive:)
return if match.nil?
match.downcase!
modifier = positive ? "" : "NOT"
if match.include?('+')
tags = match.split('+')
posts.where("topics.id #{modifier} IN (
SELECT tt.topic_id
FROM topic_tags tt, tags
WHERE tt.tag_id = tags.id
GROUP BY tt.topic_id
HAVING to_tsvector(#{default_ts_config}, array_to_string(array_agg(lower(tags.name)), ' ')) @@ to_tsquery(#{default_ts_config}, ?)
)", tags.join('&'))
else
tags = match.split(",")
posts.where("topics.id #{modifier} IN (
SELECT DISTINCT(tt.topic_id)
FROM topic_tags tt, tags
WHERE tt.tag_id = tags.id AND lower(tags.name) IN (?)
)", tags)
end
end
def process_advanced_search!(term)
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term.to_s.scan(/(([^" \t\n\x0B\f\r]+)?(("[^"]+")?))/).to_a.map do |(word, _)|
next if word.blank?
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found = false
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Search.advanced_filters.each do |matcher, block|
cleaned = word.gsub(/["']/, "")
if cleaned =~ matcher
(@filters ||= []) << [block, $1]
found = true
end
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end
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if word == 'order:latest' || word == 'l'
@order = :latest
nil
elsif word == 'order:latest_topic'
@order = :latest_topic
nil
elsif word == 'in:title' || word == 't'
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@in_title = true
nil
elsif word =~ /topic:(\d+)/
topic_id = $1.to_i
if topic_id > 1
topic = Topic.find_by(id: topic_id)
if @guardian.can_see?(topic)
@search_context = topic
end
end
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nil
elsif word == 'order:views'
@order = :views
nil
elsif word == 'order:likes'
@order = :likes
nil
elsif word == 'in:all'
@search_all_topics = true
nil
elsif %w{in:private in:personal}.include?(word) # remove private after 2.4 release
@search_pms = true
nil
elsif word == "in:personal-direct"
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@search_pms = true
@direct_pms_only = true
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nil
elsif word =~ /^personal_messages:(.+)$/
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@search_pms = true
nil
else
found ? nil : word
end
end.compact.join(' ')
end
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def find_grouped_results
if @results.type_filter.present?
raise Discourse::InvalidAccess.new("invalid type filter") unless Search.facets.include?(@results.type_filter)
# calling protected methods
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send("#{@results.type_filter}_search")
else
unless @search_context
user_search if @term.present?
category_search if @term.present?
tags_search if @term.present?
groups_search if @term.present?
end
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topic_search
end
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add_more_topics_if_expected
@results
rescue ActiveRecord::StatementInvalid
# In the event of a PG:Error return nothing, it is likely they used a foreign language whose
# locale is not supported by postgres
end
# Add more topics if we expected them
def add_more_topics_if_expected
expected_topics = 0
expected_topics = Search.facets.size unless @results.type_filter.present?
expected_topics = Search.per_facet * Search.facets.size if @results.type_filter == 'topic'
expected_topics -= @results.posts.length
if expected_topics > 0
extra_posts = posts_query(expected_topics * Search.burst_factor)
extra_posts = extra_posts.where("posts.topic_id NOT in (?)", @results.posts.map(&:topic_id)) if @results.posts.present?
extra_posts.each do |post|
@results.add(post)
expected_topics -= 1
break if expected_topics == 0
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end
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end
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end
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# If we're searching for a single topic
def single_topic(id)
if @opts[:restrict_to_archetype].present?
archetype = @opts[:restrict_to_archetype] == Archetype.default ? Archetype.default : Archetype.private_message
post = Post.joins(:topic)
.where("topics.id = :id AND topics.archetype = :archetype AND posts.post_number = 1", id: id, archetype: archetype)
.first
else
post = Post.find_by(topic_id: id, post_number: 1)
end
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return nil unless @guardian.can_see?(post)
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@results.add(post)
@results
end
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def secure_category_ids
return @secure_category_ids unless @secure_category_ids.nil?
@secure_category_ids = @guardian.secure_category_ids
end
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def category_search
# scope is leaking onto Category, this is not good and probably a bug in Rails
# the secure_category_ids will invoke the same method on User, it calls Category.where
# however the scope from the query below is leaking in to Category, this works around
# the issue while we figure out what is up in Rails
secure_category_ids
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categories = Category.includes(:category_search_data)
.where("category_search_data.search_data @@ #{ts_query}")
.references(:category_search_data)
.order("topics_month DESC")
.secured(@guardian)
.limit(limit)
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categories.each do |category|
@results.add(category)
end
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end
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def user_search
return if SiteSetting.hide_user_profiles_from_public && !@guardian.user
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users = User.includes(:user_search_data)
.references(:user_search_data)
.where(active: true)
.where(staged: false)
.where("user_search_data.search_data @@ #{ts_query("simple")}")
.order("CASE WHEN username_lower = '#{@original_term.downcase}' THEN 0 ELSE 1 END")
.order("last_posted_at DESC")
.limit(limit)
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users.each do |user|
@results.add(user)
end
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end
def groups_search
groups = Group
.visible_groups(@guardian.user, "name ASC", include_everyone: false)
.where("name ILIKE :term OR full_name ILIKE :term", term: "%#{@term}%")
groups.each { |group| @results.add(group) }
end
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def tags_search
return unless SiteSetting.tagging_enabled
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tags = Tag.includes(:tag_search_data)
.where("tag_search_data.search_data @@ #{ts_query}")
.references(:tag_search_data)
.order("name asc")
.limit(limit)
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tags.each do |tag|
@results.add(tag)
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end
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end
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PHRASE_MATCH_REGEXP_PATTERN = '"([^"]+)"'
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def posts_query(limit, opts = nil)
opts ||= {}
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posts = Post.where(post_type: Topic.visible_post_types(@guardian.user))
.joins(:post_search_data, :topic)
.joins("LEFT JOIN categories ON categories.id = topics.category_id")
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is_topic_search = @search_context.present? && @search_context.is_a?(Topic)
posts = posts.where("topics.visible") unless is_topic_search
if opts[:type_filter] === "private_messages" || (is_topic_search && @search_context.private_message?)
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posts = posts.where("topics.archetype = ?", Archetype.private_message)
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unless @guardian.is_admin?
posts = posts.private_posts_for_user(@guardian.user)
end
elsif opts[:type_filter] === "all_topics"
private_posts = posts.where("topics.archetype = ?", Archetype.private_message)
private_posts = private_posts.private_posts_for_user(@guardian.user)
posts = posts.where("topics.archetype <> ?", Archetype.private_message).or(private_posts)
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else
posts = posts.where("topics.archetype <> ?", Archetype.private_message)
end
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if @term.present?
if is_topic_search
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term_without_quote = @term
if @term =~ /"(.+)"/
term_without_quote = $1
end
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if @term =~ /'(.+)'/
term_without_quote = $1
end
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posts = posts.joins('JOIN users u ON u.id = posts.user_id')
posts = posts.where("posts.raw || ' ' || u.username || ' ' || COALESCE(u.name, '') ilike ?", "%#{term_without_quote}%")
else
# A is for title
# B is for category
# C is for tags
# D is for cooked
weights = @in_title ? 'A' : (SiteSetting.tagging_enabled ? 'ABCD' : 'ABD')
posts = posts.where("post_search_data.search_data @@ #{ts_query(weight_filter: weights)}")
exact_terms = @term.scan(Regexp.new(PHRASE_MATCH_REGEXP_PATTERN)).flatten
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exact_terms.each do |exact|
posts = posts.where("posts.raw ilike :exact OR topics.title ilike :exact", exact: "%#{exact}%")
end
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end
end
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@filters.each do |block, match|
if block.arity == 1
posts = instance_exec(posts, &block) || posts
else
posts = instance_exec(posts, match, &block) || posts
end
end if @filters
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# If we have a search context, prioritize those posts first
posts =
if @search_context.present?
if @search_context.is_a?(User)
if opts[:type_filter] === "private_messages"
@direct_pms_only ? posts : posts.private_posts_for_user(@search_context)
else
posts.where("posts.user_id = #{@search_context.id}")
end
elsif @search_context.is_a?(Category)
category_ids = Category
.where(parent_category_id: @search_context.id)
.pluck(:id)
.push(@search_context.id)
posts.where("topics.category_id in (?)", category_ids)
elsif @search_context.is_a?(Topic)
posts.where("topics.id = #{@search_context.id}")
.order("posts.post_number #{@order == :latest ? "DESC" : ""}")
elsif @search_context.is_a?(Tag)
posts = posts
.joins("LEFT JOIN topic_tags ON topic_tags.topic_id = topics.id")
.joins("LEFT JOIN tags ON tags.id = topic_tags.tag_id")
posts.where("tags.id = #{@search_context.id}")
end
else
posts = categories_ignored(posts) unless @category_filter_matched
posts
end
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if @order == :latest || (@term.blank? && !@order)
if opts[:aggregate_search]
posts = posts.order("MAX(posts.created_at) DESC")
else
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posts = posts.reorder("posts.created_at DESC")
end
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elsif @order == :latest_topic
if opts[:aggregate_search]
posts = posts.order("MAX(topics.created_at) DESC")
else
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posts = posts.order("topics.created_at DESC")
end
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elsif @order == :views
if opts[:aggregate_search]
posts = posts.order("MAX(topics.views) DESC")
else
posts = posts.order("topics.views DESC")
end
elsif @order == :likes
if opts[:aggregate_search]
posts = posts.order("MAX(posts.like_count) DESC")
else
posts = posts.order("posts.like_count DESC")
end
else
# 1|32 divides the rank by 1 + logarithm of the document length and
# scales the range from zero to one
data_ranking = <<~SQL
(
TS_RANK_CD(
post_search_data.search_data,
#{ts_query(weight_filter: weights)},
1|32
) *
(
CASE categories.search_priority
WHEN #{Searchable::PRIORITIES[:very_low]}
THEN #{SiteSetting.category_search_priority_very_low_weight}
WHEN #{Searchable::PRIORITIES[:low]}
THEN #{SiteSetting.category_search_priority_low_weight}
WHEN #{Searchable::PRIORITIES[:high]}
THEN #{SiteSetting.category_search_priority_high_weight}
WHEN #{Searchable::PRIORITIES[:very_high]}
THEN #{SiteSetting.category_search_priority_very_high_weight}
ELSE
CASE WHEN topics.closed
THEN 0.9
ELSE 1
END
END
)
)
SQL
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if opts[:aggregate_search]
posts = posts.order("MAX(#{data_ranking}) DESC")
else
posts = posts.order("#{data_ranking} DESC")
end
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posts = posts.order("topics.bumped_at DESC")
end
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if secure_category_ids.present?
posts = posts.where("(categories.id IS NULL) OR (NOT categories.read_restricted) OR (categories.id IN (?))", secure_category_ids).references(:categories)
else
posts = posts.where("(categories.id IS NULL) OR (NOT categories.read_restricted)").references(:categories)
end
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posts = posts.offset(offset)
posts.limit(limit)
end
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def categories_ignored(posts)
posts.where(<<~SQL, Searchable::PRIORITIES[:ignore])
categories.id NOT IN (
SELECT categories.id WHERE categories.search_priority = ?
)
SQL
end
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def self.default_ts_config
"'#{Search.ts_config}'"
end
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def default_ts_config
self.class.default_ts_config
end
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def self.ts_query(term: , ts_config: nil, joiner: "&", weight_filter: nil)
data = DB.query_single(
"SELECT TO_TSVECTOR(:config, :term)",
config: 'simple',
term: term
).first
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ts_config = ActiveRecord::Base.connection.quote(ts_config) if ts_config
all_terms = data.scan(/'([^']+)'\:\d+/).flatten
all_terms.map! do |t|
t.split(/[\)\(&']/).find(&:present?)
end.compact!
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query = ActiveRecord::Base.connection.quote(
all_terms
.map { |t| "'#{PG::Connection.escape_string(t)}':*#{weight_filter}" }
.join(" #{joiner} ")
)
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"TO_TSQUERY(#{ts_config || default_ts_config}, #{query})"
end
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def ts_query(ts_config = nil, weight_filter: nil)
@ts_query_cache ||= {}
@ts_query_cache["#{ts_config || default_ts_config} #{@term} #{weight_filter}"] ||=
Search.ts_query(term: @term, ts_config: ts_config, weight_filter: weight_filter)
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end
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def wrap_rows(query)
"SELECT *, row_number() over() row_number FROM (#{query.to_sql}) xxx"
end
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def aggregate_post_sql(opts)
min_or_max = @order == :latest ? "max" : "min"
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query =
if @order == :likes
# likes are a pain to aggregate so skip
posts_query(limit, type_filter: opts[:type_filter])
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.select('topics.id', "posts.post_number")
else
posts_query(limit, aggregate_search: true, type_filter: opts[:type_filter])
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.select('topics.id', "#{min_or_max}(posts.post_number) post_number")
.group('topics.id')
end
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min_id = Search.min_post_id
if min_id > 0
low_set = query.dup.where("post_search_data.post_id < #{min_id}")
high_set = query.where("post_search_data.post_id >= #{min_id}")
return { default: wrap_rows(high_set), remaining: wrap_rows(low_set) }
end
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# double wrapping so we get correct row numbers
{ default: wrap_rows(query) }
end
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def aggregate_posts(post_sql)
return [] unless post_sql
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posts_eager_loads(Post)
.joins("JOIN (#{post_sql}) x ON x.id = posts.topic_id AND x.post_number = posts.post_number")
.order('row_number')
end
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def aggregate_search(opts = {})
post_sql = aggregate_post_sql(opts)
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added = 0
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aggregate_posts(post_sql[:default]).each do |p|
@results.add(p)
added += 1
end
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if added < limit
aggregate_posts(post_sql[:remaining]).each { |p| @results.add(p) }
end
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end
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def private_messages_search
raise Discourse::InvalidAccess.new("anonymous can not search PMs") unless @guardian.user
aggregate_search(type_filter: "private_messages")
end
def all_topics_search
aggregate_search(type_filter: "all_topics")
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end
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def topic_search
if @search_context.is_a?(Topic)
posts = posts_eager_loads(posts_query(limit))
.where('posts.topic_id = ?', @search_context.id)
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posts.each do |post|
@results.add(post)
end
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else
aggregate_search
end
end
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def posts_eager_loads(query)
query = query.includes(:user)
topic_eager_loads = [:category]
if SiteSetting.tagging_enabled
topic_eager_loads << :tags
end
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query.includes(topic: topic_eager_loads)
end
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end