Optimized n+1 queries in accounts Atom and HTML views

Added stack trace for SQL queries in development
Removed badly thought out accounts/lookup API

Gemfile

@@ -60,6 +60,7 @@ group :development do
   gem 'binding_of_caller'
   gem 'letter_opener'
   gem 'bullet'
+  gem 'active_record_query_trace'
 end
 
 group :production do

Gemfile.lock

@@ -36,6 +36,7 @@ GEM
       erubis (~> 2.7.0)
       rails-dom-testing (~> 2.0)
       rails-html-sanitizer (~> 1.0, >= 1.0.2)
+    active_record_query_trace (1.5.3)
     activejob (5.0.0.1)
       activesupport (= 5.0.0.1)
       globalid (>= 0.3.6)
@@ -360,6 +361,7 @@ PLATFORMS
   ruby
 
 DEPENDENCIES
+  active_record_query_trace
   addressable
   better_errors
   binding_of_caller

app/controllers/accounts_controller.rb

@@ -6,14 +6,21 @@ class AccountsController < ApplicationController
 
   def show
     respond_to do |format|
-      format.html { @statuses = @account.statuses.order('id desc').with_includes.with_counters.paginate(page: params[:page], per_page: 10)}
+      format.html do
+        @statuses   = @account.statuses.order('id desc').with_includes.with_counters.paginate(page: params[:page], per_page: 10)
+
+        if user_signed_in?
+          status_ids  = @statuses.collect { |s| [s.id, s.reblog_of_id] }.flatten.uniq
+          @favourited = Favourite.where(status_id: status_ids).where(account_id: current_user.account_id).map { |f| [f.status_id, true] }.to_h
+          @reblogged  = Status.where(reblog_of_id: status_ids).where(account_id: current_user.account_id).map { |s| [s.reblog_of_id, true] }.to_h
+        else
+          @favourited = {}
+          @reblogged  = {}
+        end
+      end
 
       format.atom do
         @entries = @account.stream_entries.order('id desc').with_includes.paginate_by_max_id(20, params[:max_id] || nil)
-
-        ActiveRecord::Associations::Preloader.new.preload(@entries.select { |a| a.activity_type == 'Status' }, activity: [:mentions, :media_attachments, reblog: :account, thread: :account])
-        ActiveRecord::Associations::Preloader.new.preload(@entries.select { |a| a.activity_type == 'Favourite' }, activity: [:account, :status])
-        ActiveRecord::Associations::Preloader.new.preload(@entries.select { |a| a.activity_type == 'Follow' }, activity: :target_account)
       end
     end
   end

app/controllers/api/accounts/lookup_controller.rb

@@ -1,14 +0,0 @@
-class Api::Accounts::LookupController < ApiController
-  before_action :doorkeeper_authorize!
-  respond_to    :json
-
-  def index
-    @accounts = Account.where(domain: nil).where(username: lookup_params)
-  end
-
-  private
-
-  def lookup_params
-    (params[:usernames] || '').split(',').map(&:strip)
-  end
-end

app/helpers/api/accounts/lookup_helper.rb

@@ -1,2 +0,0 @@
-module Api::Accounts::LookupHelper
-end

app/helpers/application_helper.rb

@@ -22,23 +22,26 @@ module ApplicationHelper
 
   def account_from_mentions(search_string, mentions)
     mentions.each { |x| return x.account if x.account.acct.eql?(search_string) }
+    nil
 
     # If that was unsuccessful, try fetching user from db separately
     # But this shouldn't ever happen if the mentions were created correctly!
-    username, domain = search_string.split('@')
+    # username, domain = search_string.split('@')
 
-    if domain == Rails.configuration.x.local_domain
+    # if domain == Rails.configuration.x.local_domain
-      account = Account.find_local(username)
+    #   account = Account.find_local(username)
-    else
+    # else
-      account = Account.find_remote(username, domain)
+    #   account = Account.find_remote(username, domain)
-    end
+    # end
 
-    account
+    # account
   end
 
   def linkify(status)
     auto_link(HTMLEntities.new.encode(status.text), link: :urls, html: { rel: 'nofollow noopener' }).gsub(Account::MENTION_RE) do |m|
-      if account = account_from_mentions(Account::MENTION_RE.match(m)[1], status.mentions)
+      account = account_from_mentions(Account::MENTION_RE.match(m)[1], status.mentions)
+
+      unless account.nil?
         "#{m.split('@').first}<a href=\"#{url_for_target(account)}\" class=\"mention\">@<span>#{account.acct}</span></a>"
       else
         m

app/helpers/stream_entries_helper.rb

@@ -21,11 +21,11 @@ module StreamEntriesHelper
   end
 
   def reblogged_by_me_class(status)
-    user_signed_in? && current_user.account.reblogged?(status) ? 'reblogged' : ''
+    user_signed_in? && @reblogged.has_key?(status.id) ? 'reblogged' : ''
   end
 
   def favourited_by_me_class(status)
-    user_signed_in? && current_user.account.favourited?(status) ? 'favourited' : ''
+    user_signed_in? && @favourited.has_key?(status.id) ? 'favourited' : ''
   end
 
   def proper_status(status)

app/models/status.rb

@@ -18,7 +18,7 @@ class Status < ApplicationRecord
   validates :text, presence: true, if: Proc.new { |s| s.local? && !s.reblog? }
 
   scope :with_counters, -> { select('statuses.*, (select count(r.id) from statuses as r where r.reblog_of_id = statuses.id) as reblogs_count, (select count(f.id) from favourites as f where f.status_id = statuses.id) as favourites_count') }
-  scope :with_includes, -> { includes(:account, :mentions, :media_attachments, :stream_entry, reblog: [:account, :mentions], thread: :account) }
+  scope :with_includes, -> { includes(:account, :media_attachments, :stream_entry, mentions: :account, reblog: [:account, mentions: :account], thread: :account) }
 
   def local?
     self.uri.nil?

app/models/stream_entry.rb

@@ -4,9 +4,15 @@ class StreamEntry < ApplicationRecord
   belongs_to :account, inverse_of: :stream_entries
   belongs_to :activity, polymorphic: true
 
+  belongs_to :status,    foreign_type: 'Status',    foreign_key: 'activity_id'
+  belongs_to :follow,    foreign_type: 'Follow',    foreign_key: 'activity_id'
+  belongs_to :favourite, foreign_type: 'Favourite', foreign_key: 'activity_id'
+
   validates :account, :activity, presence: true
 
-  scope :with_includes, -> { includes(:activity) }
+  STATUS_INCLUDES = [:account, :stream_entry, :media_attachments, mentions: :account, reblog: [:stream_entry, :account, mentions: :account], thread: [:stream_entry, :account]]
+
+  scope :with_includes, -> { includes(:account, status: STATUS_INCLUDES, favourite: [:account, :stream_entry, status: STATUS_INCLUDES], follow: [:target_account, :stream_entry]) }
 
   def object_type
     orphaned? ? :activity : (targeted? ? :activity : self.activity.object_type)
@@ -44,6 +50,10 @@ class StreamEntry < ApplicationRecord
     self.activity.respond_to?(:mentions) ? self.activity.mentions.map { |x| x.account } : []
   end
 
+  def activity
+    self.send(self.activity_type.downcase.to_sym)
+  end
+
   private
 
   def orphaned?

config/environments/development.rb

@@ -61,7 +61,7 @@ Rails.application.configure do
   config.after_initialize do
     Bullet.enable        = true
     Bullet.bullet_logger = true
-    Bullet.rails_logger = true
+    Bullet.rails_logger  = false
 
     Bullet.add_whitelist type: :n_plus_one_query, class_name: 'User', association: :account
   end
@@ -71,3 +71,5 @@ end
 
 require 'sidekiq/testing'
 Sidekiq::Testing.inline!
+
+ActiveRecordQueryTrace.enabled = true

config/routes.rb

@@ -56,10 +56,6 @@ Rails.application.routes.draw do
     resources :media,    only: [:create]
 
     resources :accounts, only: [:show] do
-      collection do
-        get :lookup, to: 'accounts/lookup#index', as: :lookup
-      end
-
       member do
         get :statuses
         get :followers

spec/controllers/api/accounts/lookup_controller_spec.rb

@@ -1,24 +0,0 @@
-require 'rails_helper'
-
-RSpec.describe Api::Accounts::LookupController, type: :controller do
-  render_views
-
-  let(:user)  { Fabricate(:user, account: Fabricate(:account, username: 'alice')) }
-  let(:token) { double acceptable?: true, resource_owner_id: user.id }
-
-  before do
-    allow(controller).to receive(:doorkeeper_token) { token }
-  end
-
-  describe 'GET #index' do
-    before do
-      Fabricate(:account, username: 'bob')
-      Fabricate(:account, username: 'mcbeth')
-      get :index, params: { usernames: 'alice,bob,mcbeth' }
-    end
-
-    it 'returns http success' do
-      expect(response).to have_http_status(:success)
-    end
-  end
-end

spec/helpers/api/accounts/lookup_helper_spec.rb

@@ -1,5 +0,0 @@
-require 'rails_helper'
-
-RSpec.describe Api::Accounts::LookupHelper, type: :helper do
-
-end