discourse/app/models/user_search.rb

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# Searches for a user by username or full text or name (if enabled in SiteSettings)
class UserSearch
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def initialize(term, opts={})
@term = term
@term_like = "#{term.downcase}%"
@topic_id = opts[:topic_id]
@topic_allowed_users = opts[:topic_allowed_users]
@searching_user = opts[:searching_user]
@limit = opts[:limit] || 20
end
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def scoped_users
users = User.where("active")
unless @searching_user && @searching_user.staff?
users = users.not_suspended
end
# Only show users who have access to private topic
if @topic_id && @topic_allowed_users == "true"
topic = Topic.find_by(id: @topic_id)
if topic.category && topic.category.read_restricted
users = users.includes(:secure_categories)
.where("users.admin = TRUE OR categories.id = ?", topic.category.id)
.references(:categories)
end
end
users.limit(@limit)
end
def filtered_by_term_users
users = scoped_users
if @term.present?
if SiteSetting.enable_names?
query = Search.ts_query(@term, "simple")
users = users.includes(:user_search_data)
.references(:user_search_data)
.where("username_lower LIKE :term_like OR user_search_data.search_data @@ #{query}",
term: @term, term_like: @term_like)
.order(User.sql_fragment("CASE WHEN username_lower LIKE ? THEN 0 ELSE 1 END ASC", @term_like))
else
users = users.where("username_lower LIKE :term_like", term_like: @term_like)
end
end
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users
end
def search_ids
users = Set.new
# 1. exact username matches
if @term.present?
scoped_users.where(username_lower: @term.downcase)
.pluck(:id)
.each{|id| users << id}
end
return users.to_a if users.length == @limit
# 2. in topic
if @topic_id
filtered_by_term_users.where('users.id in (SELECT p.user_id FROM posts p WHERE topic_id = ?)', @topic_id)
.order('last_seen_at DESC')
.limit(@limit - users.length)
.pluck(:id)
.each{|id| users << id}
end
return users.to_a if users.length == @limit
# 3. global matches
filtered_by_term_users.order('last_seen_at DESC')
.limit(@limit - users.length)
.pluck(:id)
.each{|id| users << id}
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