Revert the addition of goldiloader

This reverts the addition of the "goldiloader" Gem and all use of it.
While this Gem is very promising it's causing a variety of problems on
GitLab.com due to it eager-loading too much data in places where we
don't expect/can handle this. At least for the time being this means we
have to go back to manually fixing N+1 query problems, but at least
those should not cause a negative impact on availability.

Gemfile

@@ -449,5 +449,3 @@ gem 'grape_logging', '~> 1.7'
 
 # Asset synchronization
 gem 'asset_sync', '~> 2.2.0'
-
-gem 'goldiloader', '~> 2.0'

Gemfile.lock

@@ -356,9 +356,6 @@ GEM
       rubyntlm (~> 0.5)
     globalid (0.4.1)
       activesupport (>= 4.2.0)
-    goldiloader (2.0.1)
-      activerecord (>= 4.2, < 5.2)
-      activesupport (>= 4.2, < 5.2)
     gollum-grit_adapter (1.0.1)
       gitlab-grit (~> 2.7, >= 2.7.1)
     gon (6.1.0)
@@ -1107,7 +1104,6 @@ DEPENDENCIES
   gitlab-markup (~> 1.6.2)
   gitlab-styles (~> 2.3)
   gitlab_omniauth-ldap (~> 2.0.4)
-  goldiloader (~> 2.0)
   gon (~> 6.1.0)
   google-api-client (~> 0.19.8)
   google-protobuf (= 3.5.1)

app/models/ci/pipeline.rb

@@ -20,7 +20,7 @@ module Ci
     has_many :sourced_pipelines, class_name: Ci::Sources::Pipeline, foreign_key: :source_pipeline_id
 
     has_one :triggered_by_pipeline, through: :source_pipeline, source: :source_pipeline
-    has_many :triggered_pipelines, -> { auto_include(false) }, through: :sourced_pipelines, source: :pipeline
+    has_many :triggered_pipelines, through: :sourced_pipelines, source: :pipeline
 
     has_many :auto_canceled_pipelines, class_name: 'Ci::Pipeline', foreign_key: 'auto_canceled_by_id'
     has_many :auto_canceled_jobs, class_name: 'CommitStatus', foreign_key: 'auto_canceled_by_id'

app/models/ci/runner.rb

@@ -14,7 +14,7 @@ module Ci
 
     has_many :builds
     has_many :runner_projects, dependent: :destroy # rubocop:disable Cop/ActiveRecordDependent
-    has_many :projects, -> { auto_include(false) }, through: :runner_projects
+    has_many :projects, through: :runner_projects
 
     has_one :last_build, ->() { order('id DESC') }, class_name: 'Ci::Build'
 

app/models/clusters/cluster.rb

@@ -16,7 +16,7 @@ module Clusters
     belongs_to :user
 
     has_many :cluster_projects, class_name: 'Clusters::Project'
-    has_many :projects, -> { auto_include(false) }, through: :cluster_projects, class_name: '::Project'
+    has_many :projects, through: :cluster_projects, class_name: '::Project'
 
     # we force autosave to happen when we save `Cluster` model
     has_one :provider_gcp, class_name: 'Clusters::Providers::Gcp', autosave: true

app/models/concerns/issuable.rb

@@ -48,7 +48,7 @@ module Issuable
     end
 
     has_many :label_links, as: :target, dependent: :destroy # rubocop:disable Cop/ActiveRecordDependent
-    has_many :labels, -> { auto_include(false) }, through: :label_links
+    has_many :labels, through: :label_links
     has_many :todos, as: :target, dependent: :destroy # rubocop:disable Cop/ActiveRecordDependent
 
     has_one :metrics

app/models/concerns/resolvable_discussion.rb

@@ -102,7 +102,7 @@ module ResolvableDiscussion
     yield(notes_relation)
 
     # Set the notes array to the updated notes
-    @notes = notes_relation.fresh.auto_include(false).to_a # rubocop:disable Gitlab/ModuleWithInstanceVariables
+    @notes = notes_relation.fresh.to_a # rubocop:disable Gitlab/ModuleWithInstanceVariables
 
     self.class.memoized_values.each do |name|
       clear_memoization(name)

app/models/deploy_key.rb

@@ -2,7 +2,7 @@ class DeployKey < Key
   include IgnorableColumn
 
   has_many :deploy_keys_projects, inverse_of: :deploy_key, dependent: :destroy # rubocop:disable Cop/ActiveRecordDependent
-  has_many :projects, -> { auto_include(false) }, through: :deploy_keys_projects
+  has_many :projects, through: :deploy_keys_projects
 
   scope :in_projects, ->(projects) { joins(:deploy_keys_projects).where('deploy_keys_projects.project_id in (?)', projects) }
   scope :are_public,  -> { where(public: true) }

app/models/deploy_token.rb

@@ -8,7 +8,7 @@ class DeployToken < ActiveRecord::Base
   default_value_for(:expires_at) { Forever.date }
 
   has_many :project_deploy_tokens, inverse_of: :deploy_token
-  has_many :projects, -> { auto_include(false) }, through: :project_deploy_tokens
+  has_many :projects, through: :project_deploy_tokens
 
   validate :ensure_at_least_one_scope
   before_save :ensure_token

app/models/fork_network.rb

 class ForkNetwork < ActiveRecord::Base
   belongs_to :root_project, class_name: 'Project'
   has_many :fork_network_members
-  has_many :projects, -> { auto_include(false) }, through: :fork_network_members
+  has_many :projects, through: :fork_network_members
 
   after_create :add_root_as_member, if: :root_project
 

app/models/group.rb

@@ -15,9 +15,9 @@ class Group < Namespace
 
   has_many :group_members, -> { where(requested_at: nil) }, dependent: :destroy, as: :source # rubocop:disable Cop/ActiveRecordDependent
   alias_method :members, :group_members
-  has_many :users, -> { auto_include(false) }, through: :group_members
+  has_many :users, through: :group_members
   has_many :owners,
-    -> { where(members: { access_level: Gitlab::Access::OWNER }).auto_include(false) },
+    -> { where(members: { access_level: Gitlab::Access::OWNER }) },
     through: :group_members,
     source: :user
 
@@ -26,7 +26,7 @@ class Group < Namespace
 
   has_many :milestones
   has_many :project_group_links, dependent: :destroy # rubocop:disable Cop/ActiveRecordDependent
-  has_many :shared_projects, -> { auto_include(false) }, through: :project_group_links, source: :project
+  has_many :shared_projects, through: :project_group_links, source: :project
   has_many :notification_settings, dependent: :destroy, as: :source # rubocop:disable Cop/ActiveRecordDependent
   has_many :labels, class_name: 'GroupLabel'
   has_many :variables, class_name: 'Ci::GroupVariable'

app/models/issue.rb

@@ -38,7 +38,7 @@ class Issue < ActiveRecord::Base
     dependent: :delete_all # rubocop:disable Cop/ActiveRecordDependent
 
   has_many :issue_assignees
-  has_many :assignees, -> { auto_include(false) }, class_name: "User", through: :issue_assignees
+  has_many :assignees, class_name: "User", through: :issue_assignees
 
   has_one :epic_issue
   has_one :epic, through: :epic_issue

app/models/label.rb

@@ -18,8 +18,8 @@ class Label < ActiveRecord::Base
   has_many :lists, dependent: :destroy # rubocop:disable Cop/ActiveRecordDependent
   has_many :priorities, class_name: 'LabelPriority'
   has_many :label_links, dependent: :destroy # rubocop:disable Cop/ActiveRecordDependent
-  has_many :issues, -> { auto_include(false) }, through: :label_links, source: :target, source_type: 'Issue'
-  has_many :merge_requests, -> { auto_include(false) }, through: :label_links, source: :target, source_type: 'MergeRequest'
+  has_many :issues, through: :label_links, source: :target, source_type: 'Issue'
+  has_many :merge_requests, through: :label_links, source: :target, source_type: 'MergeRequest'
 
   before_validation :strip_whitespace_from_title_and_color
 

app/models/lfs_object.rb

@@ -4,7 +4,7 @@ class LfsObject < ActiveRecord::Base
   include ObjectStorage::BackgroundMove
 
   has_many :lfs_objects_projects, dependent: :destroy # rubocop:disable Cop/ActiveRecordDependent
-  has_many :projects, -> { auto_include(false) }, through: :lfs_objects_projects
+  has_many :projects, through: :lfs_objects_projects
 
   scope :with_files_stored_locally, -> { where(file_store: [nil, LfsObjectUploader::Store::LOCAL]) }
   scope :with_files_stored_remotely, -> { where(file_store: LfsObjectUploader::Store::REMOTE) }

app/models/milestone.rb

@@ -26,7 +26,7 @@ class Milestone < ActiveRecord::Base
 
   has_many :boards
   has_many :issues
-  has_many :labels, -> { distinct.reorder('labels.title').auto_include(false) }, through: :issues
+  has_many :labels, -> { distinct.reorder('labels.title') },  through: :issues
   has_many :merge_requests
   has_many :events, as: :target, dependent: :destroy # rubocop:disable Cop/ActiveRecordDependent
 

app/models/project.rb

@@ -144,10 +144,10 @@ class Project < ActiveRecord::Base
 
   # TODO: replace these relations with the fork network versions
   has_one  :forked_project_link,  foreign_key: "forked_to_project_id"
-  has_one  :forked_from_project, -> { auto_include(false) }, through:   :forked_project_link
+  has_one  :forked_from_project,  through:   :forked_project_link
 
   has_many :forked_project_links, foreign_key: "forked_from_project_id"
-  has_many :forks, -> { auto_include(false) }, through: :forked_project_links, source: :forked_to_project
+  has_many :forks,                through:     :forked_project_links, source: :forked_to_project
   # TODO: replace these relations with the fork network versions
 
   has_one :root_of_fork_network,
@@ -155,7 +155,7 @@ class Project < ActiveRecord::Base
           inverse_of: :root_project,
           class_name: 'ForkNetwork'
   has_one :fork_network_member
-  has_one :fork_network, -> { auto_include(false) }, through: :fork_network_member
+  has_one :fork_network, through: :fork_network_member
 
   # Merge Requests for target project should be removed with it
   has_many :merge_requests, foreign_key: 'target_project_id'
@@ -172,27 +172,27 @@ class Project < ActiveRecord::Base
   has_many :protected_tags
 
   has_many :project_authorizations
-  has_many :authorized_users, -> { auto_include(false) }, through: :project_authorizations, source: :user, class_name: 'User'
+  has_many :authorized_users, through: :project_authorizations, source: :user, class_name: 'User'
   has_many :project_members, -> { where(requested_at: nil) },
     as: :source, dependent: :delete_all # rubocop:disable Cop/ActiveRecordDependent
 
   alias_method :members, :project_members
-  has_many :users, -> { auto_include(false) }, through: :project_members
+  has_many :users, through: :project_members
 
   has_many :requesters, -> { where.not(requested_at: nil) },
     as: :source, class_name: 'ProjectMember', dependent: :delete_all # rubocop:disable Cop/ActiveRecordDependent
   has_many :members_and_requesters, as: :source, class_name: 'ProjectMember'
 
   has_many :deploy_keys_projects
-  has_many :deploy_keys, -> { auto_include(false) }, through: :deploy_keys_projects
+  has_many :deploy_keys, through: :deploy_keys_projects
   has_many :users_star_projects
-  has_many :starrers, -> { auto_include(false) }, through: :users_star_projects, source: :user
+  has_many :starrers, through: :users_star_projects, source: :user
   has_many :releases
   has_many :lfs_objects_projects, dependent: :destroy # rubocop:disable Cop/ActiveRecordDependent
-  has_many :lfs_objects, -> { auto_include(false) }, through: :lfs_objects_projects
+  has_many :lfs_objects, through: :lfs_objects_projects
   has_many :lfs_file_locks
   has_many :project_group_links
-  has_many :invited_groups, -> { auto_include(false) }, through: :project_group_links, source: :group
+  has_many :invited_groups, through: :project_group_links, source: :group
   has_many :pages_domains
   has_many :todos
   has_many :notification_settings, as: :source, dependent: :delete_all # rubocop:disable Cop/ActiveRecordDependent
@@ -204,7 +204,7 @@ class Project < ActiveRecord::Base
   has_one :statistics, class_name: 'ProjectStatistics'
 
   has_one :cluster_project, class_name: 'Clusters::Project'
-  has_many :clusters, -> { auto_include(false) }, through: :cluster_project, class_name: 'Clusters::Cluster'
+  has_many :clusters, through: :cluster_project, class_name: 'Clusters::Cluster'
 
   has_many :prometheus_metrics
 
@@ -223,16 +223,16 @@ class Project < ActiveRecord::Base
   has_many :builds, class_name: 'Ci::Build', inverse_of: :project, dependent: :destroy # rubocop:disable Cop/ActiveRecordDependent
   has_many :build_trace_section_names, class_name: 'Ci::BuildTraceSectionName'
   has_many :runner_projects, class_name: 'Ci::RunnerProject'
-  has_many :runners, -> { auto_include(false) }, through: :runner_projects, source: :runner, class_name: 'Ci::Runner'
+  has_many :runners, through: :runner_projects, source: :runner, class_name: 'Ci::Runner'
   has_many :variables, class_name: 'Ci::Variable'
   has_many :triggers, class_name: 'Ci::Trigger'
   has_many :environments
   has_many :deployments
   has_many :pipeline_schedules, class_name: 'Ci::PipelineSchedule'
   has_many :project_deploy_tokens
-  has_many :deploy_tokens, -> { auto_include(false) }, through: :project_deploy_tokens
+  has_many :deploy_tokens, through: :project_deploy_tokens
 
-  has_many :active_runners, -> { active.auto_include(false) }, through: :runner_projects, source: :runner, class_name: 'Ci::Runner'
+  has_many :active_runners, -> { active }, through: :runner_projects, source: :runner, class_name: 'Ci::Runner'
 
   has_one :auto_devops, class_name: 'ProjectAutoDevops'
   has_many :custom_attributes, class_name: 'ProjectCustomAttribute'

app/models/todo.rb

@@ -22,7 +22,7 @@ class Todo < ActiveRecord::Base
   belongs_to :author, class_name: "User"
   belongs_to :note
   belongs_to :project
-  belongs_to :target, -> { auto_include(false) }, polymorphic: true, touch: true # rubocop:disable Cop/PolymorphicAssociations
+  belongs_to :target, polymorphic: true, touch: true # rubocop:disable Cop/PolymorphicAssociations
   belongs_to :user
 
   delegate :name, :email, to: :author, prefix: true, allow_nil: true

app/models/user.rb

@@ -98,23 +98,23 @@ class User < ActiveRecord::Base
   # Groups
   has_many :members
   has_many :group_members, -> { where(requested_at: nil) }, source: 'GroupMember'
-  has_many :groups, -> { auto_include(false) }, through: :group_members
-  has_many :owned_groups, -> { where(members: { access_level: Gitlab::Access::OWNER }).auto_include(false) }, through: :group_members, source: :group
-  has_many :masters_groups, -> { where(members: { access_level: Gitlab::Access::MASTER }).auto_include(false) }, through: :group_members, source: :group
+  has_many :groups, through: :group_members
+  has_many :owned_groups, -> { where(members: { access_level: Gitlab::Access::OWNER }) }, through: :group_members, source: :group
+  has_many :masters_groups, -> { where(members: { access_level: Gitlab::Access::MASTER }) }, through: :group_members, source: :group
 
   # Projects
-  has_many :groups_projects, -> { auto_include(false) }, through: :groups, source: :projects
-  has_many :personal_projects, -> { auto_include(false) }, through: :namespace, source: :projects
+  has_many :groups_projects,          through: :groups, source: :projects
+  has_many :personal_projects,        through: :namespace, source: :projects
   has_many :project_members, -> { where(requested_at: nil) }
-  has_many :projects, -> { auto_include(false) }, through: :project_members
+  has_many :projects,                 through: :project_members
   has_many :created_projects,         foreign_key: :creator_id, class_name: 'Project'
   has_many :users_star_projects, dependent: :destroy # rubocop:disable Cop/ActiveRecordDependent
-  has_many :starred_projects, -> { auto_include(false) }, through: :users_star_projects, source: :project
+  has_many :starred_projects, through: :users_star_projects, source: :project
   has_many :project_authorizations
-  has_many :authorized_projects, -> { auto_include(false) }, through: :project_authorizations, source: :project
+  has_many :authorized_projects, through: :project_authorizations, source: :project
 
   has_many :user_interacted_projects
-  has_many :project_interactions, -> { auto_include(false) }, through: :user_interacted_projects, source: :project, class_name: 'Project'
+  has_many :project_interactions, through: :user_interacted_projects, source: :project, class_name: 'Project'
 
   has_many :snippets,                 dependent: :destroy, foreign_key: :author_id # rubocop:disable Cop/ActiveRecordDependent
   has_many :notes,                    dependent: :destroy, foreign_key: :author_id # rubocop:disable Cop/ActiveRecordDependent
@@ -134,7 +134,7 @@ class User < ActiveRecord::Base
   has_many :triggers,                 dependent: :destroy, class_name: 'Ci::Trigger', foreign_key: :owner_id # rubocop:disable Cop/ActiveRecordDependent
 
   has_many :issue_assignees
-  has_many :assigned_issues, -> { auto_include(false) }, class_name: "Issue", through: :issue_assignees, source: :issue
+  has_many :assigned_issues, class_name: "Issue", through: :issue_assignees, source: :issue
   has_many :assigned_merge_requests,  dependent: :nullify, foreign_key: :assignee_id, class_name: "MergeRequest" # rubocop:disable Cop/ActiveRecordDependent
 
   has_many :custom_attributes, class_name: 'UserCustomAttribute'

rubocop/cop/gitlab/has_many_through_scope.rb

-require 'gitlab/styles/rubocop/model_helpers'
-
-module RuboCop
-  module Cop
-    module Gitlab
-      class HasManyThroughScope < RuboCop::Cop::Cop
-        include ::Gitlab::Styles::Rubocop::ModelHelpers
-
-        MSG = 'Always provide an explicit scope calling auto_include(false) when using has_many :through'.freeze
-
-        def_node_search :through?, <<~PATTERN
-          (pair (sym :through) _)
-        PATTERN
-
-        def_node_matcher :has_many_through?, <<~PATTERN
-          (send nil? :has_many ... #through?)
-        PATTERN
-
-        def_node_search :disables_auto_include?, <<~PATTERN
-          (send _ :auto_include false)
-        PATTERN
-
-        def_node_matcher :scope_disables_auto_include?, <<~PATTERN
-          (block (send nil? :lambda) _ #disables_auto_include?)
-        PATTERN
-
-        def on_send(node)
-          return unless in_model?(node)
-          return unless has_many_through?(node)
-
-          target = node
-          scope_argument = node.children[3]
-
-          if scope_argument.children[0].children.last == :lambda
-            return if scope_disables_auto_include?(scope_argument)
-
-            target = scope_argument
-          end
-
-          add_offense(target, location: :expression)
-        end
-      end
-    end
-  end
-end

rubocop/rubocop.rb

 # rubocop:disable Naming/FileName
-require_relative 'cop/gitlab/has_many_through_scope'
-require_relative 'cop/gitlab/httparty'
 require_relative 'cop/gitlab/module_with_instance_variables'
 require_relative 'cop/gitlab/predicate_memoization'
+require_relative 'cop/gitlab/httparty'
 require_relative 'cop/include_sidekiq_worker'
 require_relative 'cop/avoid_return_from_blocks'
 require_relative 'cop/avoid_break_from_strong_memoize'

spec/rubocop/cop/gitlab/has_many_through_scope_spec.rb

-require 'spec_helper'
-
-require 'rubocop'
-require 'rubocop/rspec/support'
-
-require_relative '../../../../rubocop/cop/gitlab/has_many_through_scope'
-
-describe RuboCop::Cop::Gitlab::HasManyThroughScope do # rubocop:disable RSpec/FilePath
-  include CopHelper
-
-  subject(:cop) { described_class.new }
-
-  context 'in a model file' do
-    before do
-      allow(cop).to receive(:in_model?).and_return(true)
-    end
-
-    context 'when the model does not use has_many :through' do
-      it 'does not register an offense' do
-        expect_no_offenses(<<-RUBY)
-          class User < ActiveRecord::Base
-            has_many :tags, source: 'UserTag'
-          end
-        RUBY
-      end
-    end
-
-    context 'when the model uses has_many :through' do
-      context 'when the association has no scope defined' do
-        it 'registers an offense on the association' do
-          expect_offense(<<-RUBY)
-            class User < ActiveRecord::Base
-              has_many :tags, through: :user_tags
-              ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ #{described_class::MSG}
-            end
-           RUBY
-        end
-      end
-
-      context 'when the association has a scope defined' do
-        context 'when the scope does not disable auto-loading' do
-          it 'registers an offense on the scope' do
-            expect_offense(<<-RUBY)
-              class User < ActiveRecord::Base
-                has_many :tags, -> { where(active: true) }, through: :user_tags
-                                ^^^^^^^^^^^^^^^^^^^^^^^^^^ #{described_class::MSG}
-              end
-             RUBY
-          end
-        end
-
-        context 'when the scope has auto_include(false)' do
-          it 'does not register an offense' do
-            expect_no_offenses(<<-RUBY)
-              class User < ActiveRecord::Base
-                has_many :tags, -> { where(active: true).auto_include(false).reorder(nil) }, through: :user_tags
-              end
-            RUBY
-          end
-        end
-      end
-    end
-  end
-
-  context 'outside of a migration spec file' do
-    it 'does not register an offense' do
-      expect_no_offenses(<<-RUBY)
-        class User < ActiveRecord::Base
-          has_many :tags, through: :user_tags
-        end
-      RUBY
-    end
-  end
-end