Add user_type field for service users

It will be used for code review analytics
to detect service users

app/models/user.rb

@@ -60,6 +60,7 @@ class User < ApplicationRecord
   MINIMUM_INACTIVE_DAYS = 180
 
   enum bot_type: ::UserBotTypeEnums.bots
+  enum user_type: ::UserTypeEnums.types
 
   # Override Devise::Models::Trackable#update_tracked_fields!
   # to limit database writes to at most once every hour
@@ -336,7 +337,7 @@ class User < ApplicationRecord
   scope :with_dashboard, -> (dashboard) { where(dashboard: dashboard) }
   scope :with_public_profile, -> { where(private_profile: false) }
   scope :bots, -> { where.not(bot_type: nil) }
-  scope :humans, -> { where(bot_type: nil) }
+  scope :humans, -> { where(user_type: nil, bot_type: nil) }
 
   scope :with_expiring_and_not_notified_personal_access_tokens, ->(at) do
     where('EXISTS (?)',

app/models/user_bot_type_enums.rb

@@ -2,7 +2,9 @@
 
 module UserBotTypeEnums
   def self.bots
-    # When adding a new key, please ensure you are not conflicting with EE-only keys in app/models/user_bot_type_enums.rb
+    # When adding a new key, please ensure you are not conflicting
+    # with EE-only keys in app/models/user_type_enums.rb
+    # or app/models/user_bot_type_enums.rb
     {
       alert_bot: 2
     }

app/models/user_type_enums.rb

+# frozen_string_literal: true
+
+module UserTypeEnums
+  def self.types
+    # When adding a new key, please ensure you are not conflicting
+    # with EE-only keys in app/models/user_type_enums.rb
+    # or app/models/user_bot_type_enums.rb
+    bots
+  end
+
+  def self.bots
+    {
+      AlertBot: 2
+    }
+  end
+end
+
+UserTypeEnums.prepend_if_ee('EE::UserTypeEnums')

db/migrate/20200304085423_add_user_type.rb

+# frozen_string_literal: true
+
+class AddUserType < ActiveRecord::Migration[6.0]
+  include Gitlab::Database::MigrationHelpers
+
+  DOWNTIME = false
+
+  disable_ddl_transaction!
+
+  def up
+    with_lock_retries do
+      add_column :users, :user_type, :integer, limit: 2
+    end
+  end
+
+  def down
+    with_lock_retries do
+      remove_column :users, :user_type
+    end
+  end
+end

db/migrate/20200304090155_add_user_type_index.rb

+# frozen_string_literal: true
+
+class AddUserTypeIndex < ActiveRecord::Migration[6.0]
+  include Gitlab::Database::MigrationHelpers
+
+  DOWNTIME = false
+
+  disable_ddl_transaction!
+
+  def up
+    add_concurrent_index :users, :user_type
+  end
+
+  def down
+    remove_concurrent_index :users, :user_type
+  end
+end

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: 2020_03_03_074328) do
+ActiveRecord::Schema.define(version: 2020_03_04_090155) do
 
   # These are extensions that must be enabled in order to support this database
   enable_extension "pg_trgm"
@@ -4325,6 +4325,7 @@ ActiveRecord::Schema.define(version: 2020_03_03_074328) do
     t.string "last_name", limit: 255
     t.string "static_object_token", limit: 255
     t.integer "role", limit: 2
+    t.integer "user_type", limit: 2
     t.index "lower((name)::text)", name: "index_on_users_name_lower"
     t.index ["accepted_term_id"], name: "index_users_on_accepted_term_id"
     t.index ["admin"], name: "index_users_on_admin"
@@ -4347,6 +4348,7 @@ ActiveRecord::Schema.define(version: 2020_03_03_074328) do
     t.index ["state"], name: "index_users_on_state_and_internal_ee", where: "((ghost IS NOT TRUE) AND (bot_type IS NULL))"
     t.index ["static_object_token"], name: "index_users_on_static_object_token", unique: true
     t.index ["unconfirmed_email"], name: "index_users_on_unconfirmed_email", where: "(unconfirmed_email IS NOT NULL)"
+    t.index ["user_type"], name: "index_users_on_user_type"
     t.index ["username"], name: "index_users_on_username"
     t.index ["username"], name: "index_users_on_username_trigram", opclass: :gin_trgm_ops, using: :gin
   end

ee/app/models/ee/user_bot_type_enums.rb

@@ -9,7 +9,9 @@ module EE
 
       override :bots
       def bots
-        # When adding a new key, please ensure you are not redefining a key that already exists in app/models/user_bot_type_enums.rb
+        # When adding a new key, please ensure you are not conflicting
+        # with EE-only keys in app/models/user_type_enums.rb
+        # or app/models/user_bot_type_enums.rb
         super.merge(
           support_bot: 1,
           visual_review_bot: 3

ee/app/models/ee/user_type_enums.rb

+# frozen_string_literal: true
+
+module EE
+  module UserTypeEnums
+    extend ActiveSupport::Concern
+
+    class_methods do
+      extend ::Gitlab::Utils::Override
+
+      override :types
+      def types
+        # When adding a new key, please ensure you are not conflicting
+        # with EE-only keys in app/models/user_type_enums.rb
+        # or app/models/user_bot_type_enums.rb
+        super.merge(ServiceUser: 4)
+      end
+
+      override :bots
+      def bots
+        super.merge(SupportBot: 1, VisualReviewBot: 3)
+      end
+    end
+  end
+end

ee/changelogs/unreleased/202680-allow-users-to-be-marked-as-bots.yml

+---
+title: Allow users to be marked as service users
+merge_request: 202680
+author:
+type: other

ee/lib/analytics/merge_request_metrics_calculator.rb

@@ -19,7 +19,9 @@ module Analytics
 
     # rubocop: disable CodeReuse/ActiveRecord
     def first_comment_at
-      merge_request.related_notes.by_humans.where.not(author_id: merge_request.author_id).fresh.first&.created_at
+      merge_request.related_notes.by_humans
+        .where.not(author_id: merge_request.author_id)
+        .fresh.first&.created_at
     end
     # rubocop: enable CodeReuse/ActiveRecord
 

ee/spec/factories/users.rb

@@ -16,6 +16,10 @@ FactoryBot.modify do
         )
       end
     end
+
+    trait :service_user do
+      user_type { :ServiceUser }
+    end
   end
 
   factory :omniauth_user do

ee/spec/models/ee/note_spec.rb

@@ -94,10 +94,11 @@ describe Note do
   end
 
   describe '.by_humans' do
-    it 'return human notes only' do
+    it 'excludes notes by bots and service users' do
       user_note = create(:note)
       create(:system_note)
       create(:note, author: create(:user, :bot))
+      create(:note, author: create(:user, :service_user))
 
       expect(described_class.by_humans).to match_array([user_note])
     end