From 1b09c3cb173192854a38161e0fea818a13a88091 Mon Sep 17 00:00:00 2001
From: Eugen Rochko <eugen@zeonfederated.com>
Date: Wed, 22 Mar 2017 03:21:38 +0100
Subject: [PATCH] More efficient single account retrieval (0.9ms vs 50ms
 before)

---
 app/models/account.rb                                  | 10 +++++-----
 .../20170322021028_add_lowercase_index_to_accounts.rb  |  9 +++++++++
 db/schema.rb                                           |  3 ++-
 3 files changed, 16 insertions(+), 6 deletions(-)
 create mode 100644 db/migrate/20170322021028_add_lowercase_index_to_accounts.rb

diff --git a/app/models/account.rb b/app/models/account.rb
index aa0af563c..c0cd2ff64 100644
--- a/app/models/account.rb
+++ b/app/models/account.rb
@@ -187,7 +187,7 @@ class Account < ApplicationRecord
 
     def find_remote!(username, domain)
       return if username.blank?
-      where(arel_table[:username].matches(username.gsub(/[%_]/, '\\\\\0'))).where(domain.nil? ? { domain: nil } : arel_table[:domain].matches(domain.gsub(/[%_]/, '\\\\\0'))).take!
+      where('lower(accounts.username) = ?', username.downcase).where(domain.nil? ? { domain: nil } : 'lower(accounts.domain) = ?', domain&.downcase).take!
     end
 
     def find_local(username)
@@ -222,8 +222,8 @@ SQL
     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\', \'\'\' \' || ? || \' \'\'\' || \':*\')'
+      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
@@ -239,8 +239,8 @@ SQL
     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\', \'\'\' \' || ? || \' \'\'\' || \':*\')'
+      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
diff --git a/db/migrate/20170322021028_add_lowercase_index_to_accounts.rb b/db/migrate/20170322021028_add_lowercase_index_to_accounts.rb
new file mode 100644
index 000000000..43032747a
--- /dev/null
+++ b/db/migrate/20170322021028_add_lowercase_index_to_accounts.rb
@@ -0,0 +1,9 @@
+class AddLowercaseIndexToAccounts < ActiveRecord::Migration[5.0]
+  def up
+    execute 'CREATE INDEX index_accounts_on_username_and_domain_lower ON accounts (lower(username), lower(domain))'
+  end
+
+  def down
+    remove_index :accounts, name: 'index_accounts_on_username_and_domain_lower'
+  end
+end
diff --git a/db/schema.rb b/db/schema.rb
index 395034375..3ace2e32e 100644
--- a/db/schema.rb
+++ b/db/schema.rb
@@ -10,7 +10,7 @@
 #
 # It's strongly recommended that you check this file into your version control system.
 
-ActiveRecord::Schema.define(version: 20170318214217) do
+ActiveRecord::Schema.define(version: 20170322021028) do
 
   # These are extensions that must be enabled in order to support this database
   enable_extension "plpgsql"
@@ -45,6 +45,7 @@ ActiveRecord::Schema.define(version: 20170318214217) do
     t.boolean  "locked",                  default: false, null: false
     t.string   "header_remote_url",       default: "",    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 "lower((username)::text), lower((domain)::text)", name: "index_accounts_on_username_and_domain_lower", using: :btree
     t.index ["username", "domain"], name: "index_accounts_on_username_and_domain", unique: true, using: :btree
   end