Make account search blazing fast and rank followers/followees higher in the results

signup-info-prompt
Eugen Rochko 2017-03-17 20:47:38 +01:00
parent 22f9399cc3
commit ad0d82d3ce
6 changed files with 50 additions and 15 deletions

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@ -47,7 +47,6 @@ gem 'rack-attack'
gem 'rack-cors', require: 'rack/cors'
gem 'sidekiq'
gem 'rails-settings-cached'
gem 'pg_search'
gem 'simple-navigation'
gem 'statsd-instrument'
gem 'ruby-oembed', require: 'oembed'

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@ -254,10 +254,6 @@ GEM
parser (2.3.1.2)
ast (~> 2.2)
pg (0.18.4)
pg_search (1.0.6)
activerecord (>= 3.1)
activesupport (>= 3.1)
arel
pghero (1.6.2)
activerecord
powerpack (0.1.1)
@ -491,7 +487,6 @@ DEPENDENCIES
paperclip (~> 5.1)
paperclip-av-transcoder
pg
pg_search
pghero
pry-rails
puma

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@ -2,7 +2,6 @@
class Account < ApplicationRecord
include Targetable
include PgSearch
MENTION_RE = /(?:^|[^\/\w])@([a-z0-9_]+(?:@[a-z0-9\.\-]+[a-z0-9]+)?)/i
IMAGE_MIME_TYPES = ['image/jpeg', 'image/png', 'image/gif'].freeze
@ -56,9 +55,6 @@ class Account < ApplicationRecord
# PuSH subscriptions
has_many :subscriptions, dependent: :destroy
pg_search_scope :search_for, against: { display_name: 'A', username: 'B', domain: 'C' },
using: { tsearch: { prefix: true } }
scope :remote, -> { where.not(domain: nil) }
scope :local, -> { where(domain: nil) }
scope :without_followers, -> { where('(select count(f.id) from follows as f where f.target_account_id = accounts.id) = 0') }
@ -212,6 +208,42 @@ SQL
Account.find_by_sql([sql, account.id, account.id, limit])
end
def search_for(terms, limit = 10)
textsearch = '(setweight(to_tsvector(\'simple\', accounts.display_name), \'A\') || setweight(to_tsvector(\'simple\', accounts.username), \'B\') || setweight(to_tsvector(\'simple\', coalesce(accounts.domain, \'\')), \'C\'))'
query = 'to_tsquery(\'simple\', \'\'\' \' || ? || \' \'\'\' || \':*\')'
sql = <<SQL
SELECT
accounts.*,
ts_rank_cd(#{textsearch}, #{query}, 32) AS rank
FROM accounts
WHERE #{query} @@ #{textsearch}
ORDER BY rank DESC
LIMIT ?
SQL
Account.find_by_sql([sql, terms, terms, limit])
end
def advanced_search_for(terms, account, limit = 10)
textsearch = '(setweight(to_tsvector(\'simple\', accounts.display_name), \'A\') || setweight(to_tsvector(\'simple\', accounts.username), \'B\') || setweight(to_tsvector(\'simple\', coalesce(accounts.domain, \'\')), \'C\'))'
query = 'to_tsquery(\'simple\', \'\'\' \' || ? || \' \'\'\' || \':*\')'
sql = <<SQL
SELECT
accounts.*,
(count(f.id) + 1) * ts_rank_cd(#{textsearch}, #{query}, 32) AS rank
FROM accounts
LEFT OUTER JOIN follows AS f ON (accounts.id = f.account_id AND f.target_account_id = ?) OR (accounts.id = f.target_account_id AND f.account_id = ?)
WHERE #{query} @@ #{textsearch}
GROUP BY accounts.id
ORDER BY rank DESC
LIMIT ?
SQL
Account.find_by_sql([sql, terms, account.id, account.id, terms, limit])
end
def following_map(target_account_ids, account_id)
follow_mapping(Follow.where(target_account_id: target_account_ids, account_id: account_id), :target_account_id)
end

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@ -1,7 +1,7 @@
# frozen_string_literal: true
class SearchService < BaseService
def call(query, limit, resolve = false)
def call(query, limit, resolve = false, account = nil)
return if query.blank? || query.start_with?('#')
username, domain = query.gsub(/\A@/, '').split('@')
@ -9,13 +9,12 @@ class SearchService < BaseService
if domain.nil?
exact_match = Account.find_local(username)
results = Account.search_for(username)
results = account.nil? ? Account.search_for(username, limit) : Account.advanced_search_for(username, account, limit)
else
exact_match = Account.find_remote(username, domain)
results = Account.search_for("#{username} #{domain}")
results = account.nil? ? Account.search_for("#{username} #{domain}", limit) : Account.advanced_search_for("#{username} #{domain}", account, limit)
end
results = results.limit(limit).to_a
results = [exact_match] + results.reject { |a| a.id == exact_match.id } if exact_match
if resolve && !exact_match && !domain.nil?

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@ -0,0 +1,9 @@
class AddSearchIndexToAccounts < ActiveRecord::Migration[5.0]
def up
execute 'CREATE INDEX search_index ON accounts USING gin((setweight(to_tsvector(\'simple\', accounts.display_name), \'A\') || setweight(to_tsvector(\'simple\', accounts.username), \'B\') || setweight(to_tsvector(\'simple\', coalesce(accounts.domain, \'\')), \'C\')));'
end
def down
remove_index :accounts, name: :search_index
end
end

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@ -10,7 +10,7 @@
#
# It's strongly recommended that you check this file into your version control system.
ActiveRecord::Schema.define(version: 20170304202101) do
ActiveRecord::Schema.define(version: 20170317193015) do
# These are extensions that must be enabled in order to support this database
enable_extension "plpgsql"
@ -43,6 +43,7 @@ ActiveRecord::Schema.define(version: 20170304202101) do
t.boolean "silenced", default: false, null: false
t.boolean "suspended", default: false, null: false
t.boolean "locked", default: false, null: false
t.index "(((setweight(to_tsvector('simple'::regconfig, (display_name)::text), 'A'::\"char\") || setweight(to_tsvector('simple'::regconfig, (username)::text), 'B'::\"char\")) || setweight(to_tsvector('simple'::regconfig, (COALESCE(domain, ''::character varying))::text), 'C'::\"char\")))", name: "search_index", using: :gin
t.index ["username", "domain"], name: "index_accounts_on_username_and_domain", unique: true, using: :btree
end