discourse/app/models/user_search.rb

179 lines
4.9 KiB
Ruby

# frozen_string_literal: true
class UserSearch
MAX_SIZE_PRIORITY_MENTION ||= 500
def initialize(term, opts = {})
@term = term.downcase
@term_like = @term.gsub("_", "\\_") + "%"
@topic_id = opts[:topic_id]
@category_id = opts[:category_id]
@topic_allowed_users = opts[:topic_allowed_users]
@searching_user = opts[:searching_user]
@include_staged_users = opts[:include_staged_users] || false
@limit = opts[:limit] || 20
@groups = opts[:groups]
@topic = Topic.find(@topic_id) if @topic_id
@category = Category.find(@category_id) if @category_id
@guardian = Guardian.new(@searching_user)
@guardian.ensure_can_see_groups_members!(@groups) if @groups
@guardian.ensure_can_see_category!(@category) if @category
@guardian.ensure_can_see_topic!(@topic) if @topic
end
def scoped_users
users = User.where(active: true)
users = users.where(staged: false) unless @include_staged_users
users = users.not_suspended unless @searching_user&.staff?
if @groups
users = users
.joins(:group_users)
.where("group_users.group_id IN (?)", @groups.map(&:id))
end
# Only show users who have access to private topic
if @topic_allowed_users == "true" && @topic&.category&.read_restricted
users = users
.references(:categories)
.includes(:secure_categories)
.where("users.admin OR categories.id = ?", @topic.category_id)
end
users
end
def filtered_by_term_users
if @term.blank?
scoped_users
elsif SiteSetting.enable_names? && @term !~ /[_\.-]/
query = Search.ts_query(term: @term, ts_config: "simple")
scoped_users
.includes(:user_search_data)
.where("user_search_data.search_data @@ #{query}")
.order(DB.sql_fragment("CASE WHEN username_lower LIKE ? THEN 0 ELSE 1 END ASC", @term_like))
else
scoped_users.where("username_lower LIKE :term_like", term_like: @term_like)
end
end
def search_ids
users = Set.new
# 1. exact username matches
if @term.present?
exact_matches = scoped_users.where(username_lower: @term)
# don't pollute mentions with users who haven't shown up in over a year
exact_matches = exact_matches.where('last_seen_at > ?', 1.year.ago) if @topic_id || @category_id
exact_matches
.limit(@limit)
.pluck(:id)
.each { |id| users << id }
end
return users.to_a if users.size >= @limit
# 2. in topic
if @topic_id
in_topic = filtered_by_term_users
.where('users.id IN (SELECT user_id FROM posts WHERE topic_id = ?)', @topic_id)
if @searching_user.present?
in_topic = in_topic.where('users.id <> ?', @searching_user.id)
end
in_topic
.order('last_seen_at DESC NULLS LAST')
.limit(@limit - users.size)
.pluck(:id)
.each { |id| users << id }
end
return users.to_a if users.size >= @limit
# 3. in category
secure_category_id =
if @category_id
DB.query_single(<<~SQL, @category_id).first
SELECT id
FROM categories
WHERE read_restricted
AND id = ?
SQL
elsif @topic_id
DB.query_single(<<~SQL, @topic_id).first
SELECT id
FROM categories
WHERE read_restricted
AND id IN (SELECT category_id FROM topics WHERE id = ?)
SQL
end
if secure_category_id
category_groups = Group.where(<<~SQL, secure_category_id, MAX_SIZE_PRIORITY_MENTION)
groups.id IN (
SELECT group_id
FROM category_groups
JOIN groups g ON group_id = g.id
WHERE category_id = ?
AND user_count < ?
)
SQL
if @searching_user.present?
category_groups = category_groups.members_visible_groups(@searching_user)
end
in_category = filtered_by_term_users
.where(<<~SQL, category_groups.pluck(:id))
users.id IN (
SELECT gu.user_id
FROM group_users gu
WHERE group_id IN (?)
LIMIT 200
)
SQL
if @searching_user.present?
in_category = in_category.where('users.id <> ?', @searching_user.id)
end
in_category
.order('last_seen_at DESC NULLS LAST')
.limit(@limit - users.size)
.pluck(:id)
.each { |id| users << id }
end
return users.to_a if users.size >= @limit
# 4. global matches
if @term.present?
filtered_by_term_users
.order('last_seen_at DESC NULLS LAST')
.limit(@limit - users.size)
.pluck(:id)
.each { |id| users << id }
end
users.to_a
end
def search
ids = search_ids
return User.where("0=1") if ids.empty?
User.joins("JOIN (SELECT unnest uid, row_number() OVER () AS rn
FROM unnest('{#{ids.join(",")}}'::int[])
) x on uid = users.id")
.order("rn")
end
end