Use ApplicationRecord instead of ActiveRecord::Base (#38975).

Patch by Minoru Maeda (@maeda-m).

git-svn-id: https://svn.redmine.org/redmine/trunk@22619 e93f8b46-1217-0410-a6f0-8f06a7374b81

.rubocop.yml

@@ -129,6 +129,10 @@ Rails/ActiveSupportOnLoad:
     # TODO: Need to check the impact on plugins. Disable for now.
     - 'lib/redmine/preparation.rb'
 
+Rails/ApplicationRecord:
+  Exclude:
+    - 'db/migrate/0*.rb'
+
 Rails/BulkChangeTable:
   Exclude:
     - 'db/migrate/20120714122200_add_workflows_rule_fields.rb'

.rubocop_todo.yml

@@ -497,10 +497,6 @@ Rails/ApplicationMailer:
     - 'app/models/mail_handler.rb'
     - 'app/models/mailer.rb'
 
-# This cop supports unsafe autocorrection (--autocorrect-all).
-Rails/ApplicationRecord:
-  Enabled: false
-
 # This cop supports safe autocorrection (--autocorrect).
 # Configuration parameters: Include.
 # Include: **/test/**/*

app/controllers/watchers_controller.rb

@@ -209,7 +209,7 @@ class WatchersController < ApplicationController
         nil
       end
     return unless klass && Class === klass # rubocop:disable Style/CaseEquality
-    return unless klass < ActiveRecord::Base
+    return unless klass < ApplicationRecord
     return unless klass < Redmine::Acts::Watchable::InstanceMethods
 
     scope = klass.where(:id => Array.wrap(params[:object_id]))

app/models/application_record.rb

@@ -0,0 +1,32 @@
+# frozen_string_literal: true
+# Redmine - project management software
+# Copyright (C) 2006-2023  Jean-Philippe Lang
+#
+# This program is free software; you can redistribute it and/or
+# modify it under the terms of the GNU General Public License
+# as published by the Free Software Foundation; either version 2
+# of the License, or (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program; if not, write to the Free Software
+# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
+class ApplicationRecord < ActiveRecord::Base
+  self.abstract_class = true
+
+  # Translate attribute names for validation errors display
+  def self.human_attribute_name(attr, options = {})
+    prepared_attr = attr.to_s.sub(/_id$/, '').sub(/^.+\./, '')
+    class_prefix = name.underscore.tr('/', '_')
+    redmine_default = [
+      :"field_#{class_prefix}_#{prepared_attr}",
+      :"field_#{prepared_attr}"
+    ]
+    options[:default] = redmine_default + Array(options[:default])
+    super
+  end
+end

app/models/attachment.rb

@@ -21,7 +21,7 @@ require "digest"
 require "fileutils"
 require "zip"
 
-class Attachment < ActiveRecord::Base
+class Attachment < ApplicationRecord
   include Redmine::SafeAttributes
   belongs_to :container, :polymorphic => true
   belongs_to :author, :class_name => "User"

app/models/auth_source.rb

@@ -22,7 +22,7 @@
 class AuthSourceException < StandardError; end
 class AuthSourceTimeoutException < AuthSourceException; end
 
-class AuthSource < ActiveRecord::Base
+class AuthSource < ApplicationRecord
   include Redmine::SafeAttributes
   include Redmine::SubclassFactory
   include Redmine::Ciphering

app/models/board.rb

@@ -17,7 +17,7 @@
 # along with this program; if not, write to the Free Software
 # Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
 
-class Board < ActiveRecord::Base
+class Board < ApplicationRecord
   include Redmine::SafeAttributes
   belongs_to :project
   has_many :messages, lambda {order("#{Message.table_name}.created_on DESC")}, :dependent => :destroy

app/models/change.rb

@@ -17,7 +17,7 @@
 # along with this program; if not, write to the Free Software
 # Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
 
-class Change < ActiveRecord::Base
+class Change < ApplicationRecord
   belongs_to :changeset
 
   validates_presence_of :changeset_id, :action, :path

app/models/changeset.rb

@@ -17,7 +17,7 @@
 # along with this program; if not, write to the Free Software
 # Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
 
-class Changeset < ActiveRecord::Base
+class Changeset < ApplicationRecord
   belongs_to :repository
   belongs_to :user
   has_many :filechanges, :class_name => 'Change', :dependent => :delete_all

app/models/comment.rb

@@ -17,7 +17,7 @@
 # along with this program; if not, write to the Free Software
 # Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
 
-class Comment < ActiveRecord::Base
+class Comment < ApplicationRecord
   include Redmine::SafeAttributes
   belongs_to :commented, :polymorphic => true, :counter_cache => true
   belongs_to :author, :class_name => 'User'

app/models/custom_field.rb

@@ -17,7 +17,7 @@
 # along with this program; if not, write to the Free Software
 # Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
 
-class CustomField < ActiveRecord::Base
+class CustomField < ApplicationRecord
   include Redmine::SafeAttributes
   include Redmine::SubclassFactory
 

app/models/custom_field_enumeration.rb

@@ -17,7 +17,7 @@
 # along with this program; if not, write to the Free Software
 # Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
 
-class CustomFieldEnumeration < ActiveRecord::Base
+class CustomFieldEnumeration < ApplicationRecord
   belongs_to :custom_field
 
   validates_presence_of :name, :position, :custom_field_id

app/models/custom_value.rb

@@ -17,7 +17,7 @@
 # along with this program; if not, write to the Free Software
 # Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
 
-class CustomValue < ActiveRecord::Base
+class CustomValue < ApplicationRecord
   belongs_to :custom_field
   belongs_to :customized, :polymorphic => true
 

app/models/document.rb

@@ -17,7 +17,7 @@
 # along with this program; if not, write to the Free Software
 # Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
 
-class Document < ActiveRecord::Base
+class Document < ApplicationRecord
   include Redmine::SafeAttributes
   belongs_to :project
   belongs_to :category, :class_name => "DocumentCategory"

app/models/email_address.rb

@@ -17,7 +17,7 @@
 # along with this program; if not, write to the Free Software
 # Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
 
-class EmailAddress < ActiveRecord::Base
+class EmailAddress < ApplicationRecord
   include Redmine::SafeAttributes
 
   belongs_to :user

app/models/enabled_module.rb

@@ -17,7 +17,7 @@
 # along with this program; if not, write to the Free Software
 # Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
 
-class EnabledModule < ActiveRecord::Base
+class EnabledModule < ApplicationRecord
   belongs_to :project
   acts_as_watchable
 

app/models/enumeration.rb

@@ -17,7 +17,7 @@
 # along with this program; if not, write to the Free Software
 # Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
 
-class Enumeration < ActiveRecord::Base
+class Enumeration < ApplicationRecord
   include Redmine::SubclassFactory
 
   default_scope lambda {order(:position)}

app/models/import.rb

@@ -19,7 +19,7 @@
 
 require 'csv'
 
-class Import < ActiveRecord::Base
+class Import < ApplicationRecord
   has_many :items, :class_name => 'ImportItem', :dependent => :delete_all
   belongs_to :user
   serialize :settings

app/models/import_item.rb

@@ -17,7 +17,7 @@
 # along with this program; if not, write to the Free Software
 # Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
 
-class ImportItem < ActiveRecord::Base
+class ImportItem < ApplicationRecord
   belongs_to :import
 
   validates_presence_of :import_id, :position

app/models/issue.rb

@@ -17,7 +17,7 @@
 # along with this program; if not, write to the Free Software
 # Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
 
-class Issue < ActiveRecord::Base
+class Issue < ApplicationRecord
   include Redmine::SafeAttributes
   include Redmine::Utils::DateCalculation
   include Redmine::I18n

app/models/issue_category.rb

@@ -17,7 +17,7 @@
 # along with this program; if not, write to the Free Software
 # Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
 
-class IssueCategory < ActiveRecord::Base
+class IssueCategory < ApplicationRecord
   include Redmine::SafeAttributes
   belongs_to :project
   belongs_to :assigned_to, :class_name => 'Principal'

app/models/issue_relation.rb

@@ -17,7 +17,7 @@
 # along with this program; if not, write to the Free Software
 # Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
 
-class IssueRelation < ActiveRecord::Base
+class IssueRelation < ApplicationRecord
   # Class used to represent the relations of an issue
   class Relations < Array
     include Redmine::I18n

app/models/issue_status.rb

@@ -17,7 +17,7 @@
 # along with this program; if not, write to the Free Software
 # Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
 
-class IssueStatus < ActiveRecord::Base
+class IssueStatus < ApplicationRecord
   include Redmine::SafeAttributes
 
   before_destroy :check_integrity

app/models/journal.rb

@@ -17,7 +17,7 @@
 # along with this program; if not, write to the Free Software
 # Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
 
-class Journal < ActiveRecord::Base
+class Journal < ApplicationRecord
   include Redmine::SafeAttributes
 
   belongs_to :journalized, :polymorphic => true

app/models/journal_detail.rb

@@ -17,7 +17,7 @@
 # along with this program; if not, write to the Free Software
 # Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
 
-class JournalDetail < ActiveRecord::Base
+class JournalDetail < ApplicationRecord
   belongs_to :journal
 
   def custom_field

app/models/member.rb

@@ -17,7 +17,7 @@
 # along with this program; if not, write to the Free Software
 # Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
 
-class Member < ActiveRecord::Base
+class Member < ApplicationRecord
   belongs_to :user
   belongs_to :principal, :foreign_key => 'user_id'
   has_many :member_roles, :dependent => :destroy

app/models/member_role.rb

@@ -17,7 +17,7 @@
 # along with this program; if not, write to the Free Software
 # Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
 
-class MemberRole < ActiveRecord::Base
+class MemberRole < ApplicationRecord
   belongs_to :member
   belongs_to :role
 

app/models/message.rb

@@ -17,7 +17,7 @@
 # along with this program; if not, write to the Free Software
 # Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
 
-class Message < ActiveRecord::Base
+class Message < ApplicationRecord
   include Redmine::SafeAttributes
   belongs_to :board
   belongs_to :author, :class_name => 'User'

app/models/news.rb

@@ -17,7 +17,7 @@
 # along with this program; if not, write to the Free Software
 # Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
 
-class News < ActiveRecord::Base
+class News < ApplicationRecord
   include Redmine::SafeAttributes
   belongs_to :project
   belongs_to :author, :class_name => 'User'

app/models/principal.rb

@@ -17,7 +17,7 @@
 # along with this program; if not, write to the Free Software
 # Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
 
-class Principal < ActiveRecord::Base
+class Principal < ApplicationRecord
   self.table_name = "#{table_name_prefix}users#{table_name_suffix}"
 
   # Account statuses

app/models/project.rb

@@ -17,7 +17,7 @@
 # along with this program; if not, write to the Free Software
 # Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
 
-class Project < ActiveRecord::Base
+class Project < ApplicationRecord
   include Redmine::SafeAttributes
   include Redmine::NestedSet::ProjectNestedSet
 

app/models/query.rb

@@ -239,7 +239,7 @@ class QueryFilter
   end
 end
 
-class Query < ActiveRecord::Base
+class Query < ApplicationRecord
   class StatementInvalid < ::ActiveRecord::StatementInvalid
   end
 

app/models/repository.rb

@@ -19,7 +19,7 @@
 
 class ScmFetchError < StandardError; end
 
-class Repository < ActiveRecord::Base
+class Repository < ApplicationRecord
   include Redmine::Ciphering
   include Redmine::SafeAttributes
 

app/models/role.rb

@@ -17,7 +17,7 @@
 # along with this program; if not, write to the Free Software
 # Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
 
-class Role < ActiveRecord::Base
+class Role < ApplicationRecord
   include Redmine::SafeAttributes
 
   # Custom coder for the permissions attribute that should be an

app/models/setting.rb

@@ -17,7 +17,7 @@
 # along with this program; if not, write to the Free Software
 # Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
 
-class Setting < ActiveRecord::Base
+class Setting < ApplicationRecord
   PASSWORD_CHAR_CLASSES = {
     'uppercase'     => /[A-Z]/,
     'lowercase'     => /[a-z]/,

app/models/time_entry.rb

@@ -17,7 +17,7 @@
 # along with this program; if not, write to the Free Software
 # Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
 
-class TimeEntry < ActiveRecord::Base
+class TimeEntry < ApplicationRecord
   include Redmine::SafeAttributes
   # could have used polymorphic association
   # project association here allows easy loading of time entries at project level with one database trip

app/models/token.rb

@@ -17,7 +17,7 @@
 # along with this program; if not, write to the Free Software
 # Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
 
-class Token < ActiveRecord::Base
+class Token < ApplicationRecord
   belongs_to :user
   validates_uniqueness_of :value, :case_sensitive => true
 

app/models/tracker.rb

@@ -17,7 +17,7 @@
 # along with this program; if not, write to the Free Software
 # Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
 
-class Tracker < ActiveRecord::Base
+class Tracker < ApplicationRecord
   include Redmine::SafeAttributes
 
   CORE_FIELDS_UNDISABLABLE = %w(project_id tracker_id subject is_private).freeze

app/models/user_preference.rb

@@ -19,7 +19,7 @@
 
 require 'redmine/my_page'
 
-class UserPreference < ActiveRecord::Base
+class UserPreference < ApplicationRecord
   include Redmine::SafeAttributes
 
   belongs_to :user

app/models/version.rb

@@ -108,7 +108,7 @@ module FixedIssuesExtension
   end
 end
 
-class Version < ActiveRecord::Base
+class Version < ApplicationRecord
   include Redmine::SafeAttributes
 
   after_update :update_issues_from_sharing_change

app/models/watcher.rb

@@ -17,7 +17,7 @@
 # along with this program; if not, write to the Free Software
 # Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
 
-class Watcher < ActiveRecord::Base
+class Watcher < ApplicationRecord
   belongs_to :watchable, :polymorphic => true
   belongs_to :user, :class_name => 'Principal'
 

app/models/wiki.rb

@@ -17,7 +17,7 @@
 # along with this program; if not, write to the Free Software
 # Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
 
-class Wiki < ActiveRecord::Base
+class Wiki < ApplicationRecord
   include Redmine::SafeAttributes
   belongs_to :project
   has_many :pages, lambda {order(Arel.sql('LOWER(title)').asc)}, :class_name => 'WikiPage', :dependent => :destroy

app/models/wiki_content.rb

@@ -19,7 +19,7 @@
 
 require 'zlib'
 
-class WikiContent < ActiveRecord::Base
+class WikiContent < ApplicationRecord
   self.locking_column = 'version'
   belongs_to :page, :class_name => 'WikiPage'
   belongs_to :author, :class_name => 'User'

app/models/wiki_content_version.rb

@@ -19,7 +19,7 @@
 
 require 'zlib'
 
-class WikiContentVersion < ActiveRecord::Base
+class WikiContentVersion < ApplicationRecord
   belongs_to :page, :class_name => 'WikiPage'
   belongs_to :author, :class_name => 'User'
 

app/models/wiki_page.rb

@@ -19,7 +19,7 @@
 
 require 'redmine/string_array_diff/diff'
 
-class WikiPage < ActiveRecord::Base
+class WikiPage < ApplicationRecord
   include Redmine::SafeAttributes
 
   belongs_to :wiki

app/models/wiki_redirect.rb

@@ -17,7 +17,7 @@
 # along with this program; if not, write to the Free Software
 # Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
 
-class WikiRedirect < ActiveRecord::Base
+class WikiRedirect < ApplicationRecord
   belongs_to :wiki
 
   validates_presence_of :wiki_id, :title, :redirects_to

app/models/workflow_rule.rb

@@ -17,7 +17,7 @@
 # along with this program; if not, write to the Free Software
 # Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
 
-class WorkflowRule < ActiveRecord::Base
+class WorkflowRule < ApplicationRecord
   self.table_name = "#{table_name_prefix}workflows#{table_name_suffix}"
 
   belongs_to :role

config/initializers/10-patches.rb

@@ -1,22 +1,6 @@
 # frozen_string_literal: true
 
 module ActiveRecord
-  class Base
-    # Translate attribute names for validation errors display
-    def self.human_attribute_name(attr, options = {})
-      prepared_attr = attr.to_s.delete_suffix('_id').sub(/^.+\./, '')
-      class_prefix = name.underscore.tr('/', '_')
-
-      redmine_default = [
-        :"field_#{class_prefix}_#{prepared_attr}",
-        :"field_#{prepared_attr}"
-      ]
-
-      options[:default] = redmine_default + Array(options[:default])
-
-      super
-    end
-  end
 
   # Undefines private Kernel#open method to allow using `open` scopes in models.
   # See Defect #11545 (http://www.redmine.org/issues/11545) for details.

extra/sample_plugin/app/models/meeting.rb

@@ -1,4 +1,4 @@
-class Meeting < ActiveRecord::Base
+class Meeting < ApplicationRecord
   belongs_to :project
 
   acts_as_event :title => Proc.new {|o| "#{o.scheduled_on} Meeting"},

lib/generators/redmine_plugin_model/redmine_plugin_model_generator.rb

@@ -63,6 +63,6 @@ class RedminePluginModelGenerator < Rails::Generators::NamedBase
   end
 
   def parent_class_name
-    options[:parent] || "ActiveRecord::Base"
+    options[:parent] || "ApplicationRecord"
   end
 end

lib/plugins/acts_as_activity_provider/init.rb

@@ -18,4 +18,6 @@
 # Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
 
 require_relative 'lib/acts_as_activity_provider'
-ActiveRecord::Base.send(:include, Redmine::Acts::ActivityProvider)
+Rails.application.reloader.to_prepare do
+  ApplicationRecord.send(:include, Redmine::Acts::ActivityProvider)
+end

lib/plugins/acts_as_attachable/init.rb

@@ -18,4 +18,6 @@
 # Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
 
 require_relative 'lib/acts_as_attachable'
-ActiveRecord::Base.send(:include, Redmine::Acts::Attachable)
+Rails.application.reloader.to_prepare do
+  ApplicationRecord.send(:include, Redmine::Acts::Attachable)
+end

lib/plugins/acts_as_customizable/init.rb

@@ -18,4 +18,6 @@
 # Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
 
 require_relative 'lib/acts_as_customizable'
-ActiveRecord::Base.send(:include, Redmine::Acts::Customizable)
+Rails.application.reloader.to_prepare do
+    ApplicationRecord.send(:include, Redmine::Acts::Customizable)
+end

lib/plugins/acts_as_event/init.rb

@@ -18,4 +18,6 @@
 # Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
 
 require_relative 'lib/acts_as_event'
-ActiveRecord::Base.send(:include, Redmine::Acts::Event)
+Rails.application.reloader.to_prepare do
+  ApplicationRecord.send(:include, Redmine::Acts::Event)
+end

lib/plugins/acts_as_searchable/init.rb

@@ -18,4 +18,6 @@
 # Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
 
 require_relative 'lib/acts_as_searchable'
-ActiveRecord::Base.send(:include, Redmine::Acts::Searchable)
+Rails.application.reloader.to_prepare do
+  ApplicationRecord.send(:include, Redmine::Acts::Searchable)
+end

lib/plugins/acts_as_tree/README

@@ -4,7 +4,7 @@ acts_as_tree
 Specify this +acts_as+ extension if you want to model a tree structure by providing a parent association and a children
 association. This requires that you have a foreign key column, which by default is called +parent_id+.
 
-  class Category < ActiveRecord::Base
+  class Category < ApplicationRecord
     acts_as_tree :order => "name"
   end
 

lib/plugins/acts_as_tree/init.rb

@@ -1,4 +1,6 @@
 # frozen_string_literal: true
 
 require_relative 'lib/active_record/acts/tree'
-ActiveRecord::Base.send :include, ActiveRecord::Acts::Tree
+Rails.application.reloader.to_prepare do
+  ApplicationRecord.send :include, ActiveRecord::Acts::Tree
+end

lib/plugins/acts_as_tree/lib/active_record/acts/tree.rb

@@ -10,7 +10,7 @@ module ActiveRecord
       # Specify this +acts_as+ extension if you want to model a tree structure by providing a parent association and a children
       # association. This requires that you have a foreign key column, which by default is called +parent_id+.
       #
-      #   class Category < ActiveRecord::Base
+      #   class Category < ApplicationRecord
       #     acts_as_tree :order => "name"
       #   end
       #

lib/plugins/acts_as_tree/test/acts_as_tree_test.rb

@@ -42,7 +42,7 @@ def teardown_db
   end
 end
 
-class Mixin < ActiveRecord::Base
+class Mixin < ApplicationRecord
 end
 
 class TreeMixin < Mixin

lib/plugins/acts_as_watchable/init.rb

@@ -19,4 +19,6 @@
 
 # Include hook code here
 require_relative 'lib/acts_as_watchable'
-ActiveRecord::Base.send(:include, Redmine::Acts::Watchable)
+Rails.application.reloader.to_prepare do
+  ApplicationRecord.send(:include, Redmine::Acts::Watchable)
+end

lib/plugins/gravatar/init.rb

@@ -1,4 +1,6 @@
 # frozen_string_literal: true
 
 require_relative 'lib/gravatar'
-ActionView::Base.send :include, GravatarHelper::PublicMethods
+Rails.application.reloader.to_prepare do
+  ApplicationRecord.send :include, GravatarHelper::PublicMethods
+end

lib/redmine/preparation.rb

@@ -20,9 +20,9 @@
 module Redmine
   module Preparation
     def self.prepare
-      ActiveRecord::Base.include Redmine::Acts::Positioned
-      ActiveRecord::Base.include Redmine::Acts::Mentionable
-      ActiveRecord::Base.include Redmine::I18n
+      ApplicationRecord.include Redmine::Acts::Positioned
+      ApplicationRecord.include Redmine::Acts::Mentionable
+      ApplicationRecord.include Redmine::I18n
 
       Scm::Base.add "Subversion"
       Scm::Base.add "Mercurial"

test/unit/initializers/patches_test.rb

@@ -27,16 +27,16 @@ class PatchesTest < ActiveSupport::TestCase
     Setting.default_language = 'en'
   end
 
-  test "ActiveRecord::Base.human_attribute_name should transform name to field_name" do
-    assert_equal l('field_last_login_on'), ActiveRecord::Base.human_attribute_name('last_login_on')
+  test "ApplicationRecord.human_attribute_name should transform name to field_name" do
+    assert_equal l('field_last_login_on'), ApplicationRecord.human_attribute_name('last_login_on')
   end
 
-  test "ActiveRecord::Base.human_attribute_name should cut extra _id suffix for better validation" do
-    assert_equal l('field_last_login_on'), ActiveRecord::Base.human_attribute_name('last_login_on_id')
+  test "ApplicationRecord.human_attribute_name should cut extra _id suffix for better validation" do
+    assert_equal l('field_last_login_on'), ApplicationRecord.human_attribute_name('last_login_on_id')
   end
 
-  test "ActiveRecord::Base.human_attribute_name should default to humanized value if no translation has been found (useful for custom fields)" do
-    assert_equal 'Patch name', ActiveRecord::Base.human_attribute_name('Patch name')
+  test "ApplicationRecord.human_attribute_name should default to humanized value if no translation has been found (useful for custom fields)" do
+    assert_equal 'Patch name', ApplicationRecord.human_attribute_name('Patch name')
   end
 
   test 'ActionView::Helpers::FormHelper.date_field should add max=9999-12-31 to limit year value to 4 digits by default' do