diff --git a/Gemfile b/Gemfile
index 4e9736347a1..5cac6fb405e 100644
--- a/Gemfile
+++ b/Gemfile
@@ -3,7 +3,7 @@ FOREMAN_GEMFILE = __FILE__ unless defined? FOREMAN_GEMFILE
 
 source 'https://rubygems.org'
 
-gem 'rails', '~> 6.1.6'
+gem 'rails', '~> 7.0.3'
 gem 'rest-client', '>= 2.0.0', '< 3', :require => 'rest_client'
 gem 'audited', '~> 5.0', '!= 5.1.0'
 gem 'will_paginate', '~> 3.3'
diff --git a/app/controllers/application_controller.rb b/app/controllers/application_controller.rb
index 70732daf073..dab973f19f6 100644
--- a/app/controllers/application_controller.rb
+++ b/app/controllers/application_controller.rb
@@ -333,10 +333,6 @@ def process_ajax_error(exception, action = nil)
     render :partial => "common/ajax_error", :status => :internal_server_error, :locals => { :message => message }
   end
 
-  def redirect_back_or_to(url)
-    redirect_back(fallback_location: url, allow_other_host: false)
-  end
-
   def saved_redirect_url_or(default)
     session["redirect_to_url_#{controller_name}"] || default
   end
diff --git a/app/controllers/links_controller.rb b/app/controllers/links_controller.rb
index d9e2a940d13..41a6d3047c0 100644
--- a/app/controllers/links_controller.rb
+++ b/app/controllers/links_controller.rb
@@ -4,7 +4,7 @@ class LinksController < ApplicationController
 
   def show
     url = external_url(type: params[:type], options: params)
-    redirect_to(url)
+    redirect_to(url, allow_other_host: true)
   end
 
   def external_url(type:, options: {})
diff --git a/app/controllers/usergroups_controller.rb b/app/controllers/usergroups_controller.rb
index b633f906739..4079b29ffe8 100644
--- a/app/controllers/usergroups_controller.rb
+++ b/app/controllers/usergroups_controller.rb
@@ -37,7 +37,7 @@ def update
       process_error
     end
   rescue Foreman::CyclicGraphException => e
-    @usergroup.errors[:usergroups] << e.record.errors[:base].join(' ')
+    @usergroup.errors.add(:usergroups, e.record.errors[:base].join(' '))
     process_error
   rescue => e
     external_usergroups_error(@usergroup, e)
diff --git a/app/graphql/collection_loader.rb b/app/graphql/collection_loader.rb
index 07217ce4617..004e3134e11 100644
--- a/app/graphql/collection_loader.rb
+++ b/app/graphql/collection_loader.rb
@@ -41,7 +41,7 @@ def validate
   end
 
   def preloader_for_association(records)
-    ::ActiveRecord::Associations::Preloader.new.preload(records, association_name, base_scope).first
+    ::ActiveRecord::Associations::Preloader.new(records: records, associations: association_name, scope: base_scope).call.first
   end
 
   def read_association(preloader, record)
diff --git a/app/helpers/layout_helper.rb b/app/helpers/layout_helper.rb
index 50779a1f7bd..ee51e8d8a6a 100644
--- a/app/helpers/layout_helper.rb
+++ b/app/helpers/layout_helper.rb
@@ -159,7 +159,7 @@ def popover(title, msg, options = {})
 
   def icon_text(i, text = "", opts = {})
     opts[:kind] ||= "glyphicon"
-    (content_tag(:span, "", :class => "#{opts[:kind] + ' ' + opts[:kind]}-#{i} #{opts[:class]}", :title => opts[:title]) + " " + text).html_safe
+    (content_tag(:span, "", :class => "#{opts[:kind] + ' ' + opts[:kind]}-#{i} #{opts[:class]}", :title => opts[:title]) + " " + text.to_s).html_safe
   end
 
   def alert(opts = {})
diff --git a/app/models/compute_resources/foreman/model/ec2.rb b/app/models/compute_resources/foreman/model/ec2.rb
index 930b3316b60..d801542190a 100644
--- a/app/models/compute_resources/foreman/model/ec2.rb
+++ b/app/models/compute_resources/foreman/model/ec2.rb
@@ -122,9 +122,9 @@ def test_connection(options = {})
       super
       errors[:user].empty? && errors[:password].empty? && regions
     rescue Fog::AWS::Compute::Error => e
-      errors[:base] << e.message
+      errors.add(:base, e.message)
     rescue Excon::Error::Socket => e
-      errors[:base] << e.message
+      errors.add(:base, e.message)
     end
 
     def console(uuid)
diff --git a/app/models/compute_resources/foreman/model/libvirt.rb b/app/models/compute_resources/foreman/model/libvirt.rb
index 123f1a18e26..1f50ec8a837 100644
--- a/app/models/compute_resources/foreman/model/libvirt.rb
+++ b/app/models/compute_resources/foreman/model/libvirt.rb
@@ -78,7 +78,7 @@ def test_connection(options = {})
       errors[:url].empty? && hypervisor
     rescue => e
       disconnect rescue nil
-      errors[:base] << e.message
+      errors.add(:base, e.message)
     end
 
     def new_nic(attr = {})
diff --git a/app/models/compute_resources/foreman/model/openstack.rb b/app/models/compute_resources/foreman/model/openstack.rb
index 3a414cfa4a3..44154ace9f8 100644
--- a/app/models/compute_resources/foreman/model/openstack.rb
+++ b/app/models/compute_resources/foreman/model/openstack.rb
@@ -91,7 +91,7 @@ def test_connection(options = {})
       super
       errors[:user].empty? && errors[:password] && tenants
     rescue => e
-      errors[:base] << e.message
+      errors.add(:base, e.message)
     end
 
     def available_images
diff --git a/app/models/compute_resources/foreman/model/vmware.rb b/app/models/compute_resources/foreman/model/vmware.rb
index 2a3d8ef38ff..80ee95421e1 100644
--- a/app/models/compute_resources/foreman/model/vmware.rb
+++ b/app/models/compute_resources/foreman/model/vmware.rb
@@ -462,7 +462,7 @@ def test_connection(options = {})
         errors.delete(:datacenter)
       end
     rescue => e
-      errors[:base] << e.message
+      errors.add(:base, e.message)
     end
 
     def parse_args(args)
diff --git a/app/models/concerns/foreman/sti.rb b/app/models/concerns/foreman/sti.rb
index 1ef85bf61ad..e13affaedf1 100644
--- a/app/models/concerns/foreman/sti.rb
+++ b/app/models/concerns/foreman/sti.rb
@@ -13,13 +13,5 @@ def new(attributes = nil, &block)
         super
       end
     end
-
-    def save(*args, **kwargs)
-      type_changed = type_changed?
-      self.class.instance_variable_set("@finder_needs_type_condition", :false) if type_changed
-      super
-    ensure
-      self.class.instance_variable_set("@finder_needs_type_condition", :true) if type_changed
-    end
   end
 end
diff --git a/app/models/concerns/hidden_value.rb b/app/models/concerns/hidden_value.rb
index be8cca69f7e..5dd951224b4 100644
--- a/app/models/concerns/hidden_value.rb
+++ b/app/models/concerns/hidden_value.rb
@@ -10,4 +10,8 @@ def safe_value
   def hidden_value
     HIDDEN_VALUE
   end
+
+  def hidden_value?
+    attributes['hidden_value']
+  end
 end
diff --git a/app/models/concerns/hostext/token.rb b/app/models/concerns/hostext/token.rb
index 910aa651222..59ebba381f6 100644
--- a/app/models/concerns/hostext/token.rb
+++ b/app/models/concerns/hostext/token.rb
@@ -5,7 +5,7 @@ module Token
     included do
       has_one :token, :foreign_key => :host_id, :dependent => :destroy, :inverse_of => :host, :class_name => 'Token::Build'
 
-      scope :for_token, ->(token) { joins(:token).where(:tokens => { :value => token }).where("expires >= ?", Time.now.utc.to_s(:db)).select('hosts.*') }
+      scope :for_token, ->(token) { joins(:token).where(:tokens => { :value => token }).where("expires >= ?", Time.now.utc.to_formatted_s(:db)).select('hosts.*') }
       scope :for_token_when_built, ->(token) { joins(:token).where(:tokens => { :value => token }).select('hosts.*') }
 
       before_validation :refresh_token_on_build
diff --git a/app/models/host.rb b/app/models/host.rb
index 9713158cbe3..b134fa25b61 100644
--- a/app/models/host.rb
+++ b/app/models/host.rb
@@ -58,4 +58,9 @@ def self.respond_to_missing?(method, include_private = false)
     method.to_s =~ /\Afind_by_(.*)\Z/ || method.to_s.include?('create') ||
       [:reorder, :new].include?(method) || super
   end
+
+  # This is a workaround for https://github.com/rails/rails/blob/v7.0.4/activerecord/lib/active_record/reflection.rb#L420-L443
+  def self.<(other)
+    other == ActiveRecord::Base || super
+  end
 end
diff --git a/app/services/foreman/preload_scopes_builder.rb b/app/services/foreman/preload_scopes_builder.rb
index 2fed836d0d3..0d8a1e3b9f5 100644
--- a/app/services/foreman/preload_scopes_builder.rb
+++ b/app/services/foreman/preload_scopes_builder.rb
@@ -26,7 +26,7 @@ def preload_scopes
     end
 
     def build_scopes(model, ignore: [], assoc_name: nil)
-      scopes = dependent_associations(model).map do |assoc|
+      scopes = dependent_associations(model, ignore: ignore).map do |assoc|
         next if ignore.include?(assoc.name)
 
         dep_associations = dependent_associations(assoc.klass)
@@ -34,8 +34,14 @@ def build_scopes(model, ignore: [], assoc_name: nil)
           ignore += dep_associations.select { |to_ignore| to_ignore.options.key?(:through) }.map(&:name)
           ignore << assoc.name
           dep_scopes = build_scopes(assoc.klass, ignore: ignore, assoc_name: assoc.name)
-          if assoc.options.key?(:through) && dep_scopes.is_a?(Hash)
-            next { assoc.options[:through] => assoc.source_reflection_name }.merge(dep_scopes)
+          if assoc.options.key?(:through)
+            deps = dependent_associations(assoc.source_reflection.klass, ignore: ignore)
+            if deps.any?
+              dep_scopes = build_scopes(assoc.source_reflection.klass, ignore: ignore, assoc_name: assoc.source_reflection_name)
+              next { assoc.options[:through] => dep_scopes }
+            else
+              next { assoc.options[:through] => assoc.source_reflection_name }
+            end
           end
           next dep_scopes
         end
@@ -46,9 +52,9 @@ def build_scopes(model, ignore: [], assoc_name: nil)
       scopes.empty? ? assoc_name : { assoc_name => scopes }
     end
 
-    def dependent_associations(model)
+    def dependent_associations(model, ignore: [])
       model.reflect_on_all_associations.select do |assoc|
-        (assoc.options.values & [:destroy, :delete_all, :destroy_async]).any?
+        !ignore.include?(assoc.name) && (assoc.options.values & [:destroy, :delete_all, :destroy_async]).any?
       end
     end
   end
diff --git a/bin/spring b/bin/spring
index 7fe232c3aae..c2ee6ba19c1 100755
--- a/bin/spring
+++ b/bin/spring
@@ -2,8 +2,7 @@
 
 # This file loads spring without using Bundler, in order to be fast.
 # It gets overwritten when you run the `spring binstub` command.
-
-unless defined?(Spring)
+if !defined?(Spring) && ARGV.grep(/test\/integration/).empty? # Disable spring for integration test
   require 'rubygems'
   require 'bundler'
 
diff --git a/bundler.d/development.rb b/bundler.d/development.rb
index f17b5a2d91c..54723b87557 100644
--- a/bundler.d/development.rb
+++ b/bundler.d/development.rb
@@ -20,7 +20,7 @@
 
   gem 'bullet', '>= 6.1.0'
   gem "parallel_tests"
-  gem 'spring', '>= 1.0', '< 3'
+  gem 'spring', '~> 4.0'
   gem 'benchmark-ips', '>= 2.8.2'
   gem 'foreman'
   gem('bootsnap', :require => false)
diff --git a/config/application.rb b/config/application.rb
index 11344ec4841..54f82855d34 100644
--- a/config/application.rb
+++ b/config/application.rb
@@ -80,7 +80,7 @@ class Foreman::Consoletie < Rails::Railtie
 
 module Foreman
   class Application < Rails::Application
-    config.load_defaults '6.1'
+    config.load_defaults '7.0'
 
     # Rails 5.0 changed this to true, but a lot of code depends on this
     config.active_record.belongs_to_required_by_default = false
@@ -99,11 +99,13 @@ class Application < Rails::Application
     config.active_support.use_authenticated_message_encryption = false
     config.action_dispatch.use_authenticated_cookie_encryption = false
 
-    # Rails 6.0 changed this to :zeitwerk
-    config.autoloader = :zeitwerk
-
     # Rails 6.1 changed this to true, but apparently our codebase is not ready for bidirectional associations
     config.active_record.has_many_inversing = false
+
+    # Rails 7.0 changed this to true
+    config.active_record.verify_foreign_keys_for_fixtures = false
+    config.active_record.automatic_scope_inversing = false
+
     # Setup additional routes by loading all routes file from routes directory
     Dir["#{Rails.root}/config/routes/**/*.rb"].each do |route_file|
       config.paths['config/routes.rb'] << route_file
@@ -113,6 +115,8 @@ class Application < Rails::Application
     # Application configuration should go into files in config/initializers
     # -- all .rb files in that directory are automatically loaded.
 
+    # Recommended by Rails: https://guides.rubyonrails.org/v7.0/configuring.html#config-add-autoload-paths-to-load-path
+    config.add_autoload_paths_to_load_path = false
     # Autoloading
     config.autoload_paths += %W(#{config.root}/app/models/auth_sources)
     config.autoload_paths += %W(#{config.root}/app/models/compute_resources)
diff --git a/config/as_deprecation_whitelist.yaml b/config/as_deprecation_whitelist.yaml
index 1a982c3557b..ed97d539c09 100644
--- a/config/as_deprecation_whitelist.yaml
+++ b/config/as_deprecation_whitelist.yaml
@@ -1,3 +1 @@
 ---
-- message: Initialization autoloaded the constants
-- message: DatabaseConfig#config will be removed in 6.2.0 in favor of DatabaseConfigurations#configuration_hash which returns a hash with symbol keys
diff --git a/config/boot.rb b/config/boot.rb
index 77d8aa1d777..eb2ddd9b742 100644
--- a/config/boot.rb
+++ b/config/boot.rb
@@ -2,8 +2,8 @@
 
 unless File.exist?(File.expand_path('../Gemfile.in', __dir__))
   ENV['BUNDLE_GEMFILE'] ||= File.expand_path('../Gemfile', __dir__)
-  # Set up boootsnap on Ruby 2.3+ in development env with Bundler enabled and development group
+  # Set up boootsnap on Ruby 2.7+ in development and test env with Bundler enabled and development/test group
   early_env = ENV["RAILS_ENV"] || ENV["RACK_ENV"] || "development"
   require 'active_support/dependencies'
-  require('bootsnap/setup') if early_env == "development" && File.exist?(ENV['BUNDLE_GEMFILE']) && !Gem::Specification.stubs_for("bootsnap").empty?
+  require('bootsnap/setup') if %w[development test].include?(early_env) && File.exist?(ENV['BUNDLE_GEMFILE']) && !Gem::Specification.stubs_for("bootsnap").empty?
 end
diff --git a/config/environments/test.rb b/config/environments/test.rb
index ae8cf0bd621..c3d6dafaad4 100644
--- a/config/environments/test.rb
+++ b/config/environments/test.rb
@@ -10,7 +10,8 @@
   # test suite. You never need to work with it otherwise. Remember that
   # your test database is "scratch space" for the test suite and is wiped
   # and recreated between test runs. Don't rely on the data there!
-  config.cache_classes = true
+  # Disable reloading for integration tests
+  config.cache_classes = ARGV.grep(/test\/integration/).any?
 
   config.eager_load = true
 
diff --git a/config/initializers/core_extensions.rb b/config/initializers/core_extensions.rb
index 3ae98c399e6..833a78b8710 100644
--- a/config/initializers/core_extensions.rb
+++ b/config/initializers/core_extensions.rb
@@ -14,7 +14,7 @@ def self.per_page
     # Foreman.in_rake? prevents the failure of db:migrate for postgresql
     # don't query settings table if in rake
     return 20 unless Foreman.settings.ready?
-    Setting[:entries_per_page] rescue 20
+    Foreman.settings[:entries_per_page] rescue 20
   end
 
   def self.audited(*args)
diff --git a/lib/tasks/webpack_compile.rake b/lib/tasks/webpack_compile.rake
index 4aaa37d538c..175d6b1cd1e 100644
--- a/lib/tasks/webpack_compile.rake
+++ b/lib/tasks/webpack_compile.rake
@@ -16,5 +16,6 @@ namespace :webpack do
     end
 
     sh "npx --max_old_space_size=#{max_old_space_size} webpack --config #{config_file} --bail"
+    ActiveRecord::Base.clear_all_connections!
   end
 end
diff --git a/test/factories/audit.rb b/test/factories/audit.rb
index 8f1f525df63..98674cd0708 100644
--- a/test/factories/audit.rb
+++ b/test/factories/audit.rb
@@ -1,7 +1,7 @@
 FactoryBot.define do
   factory :audit do
     sequence(:version) { |n| n.to_s }
-    auditable_type { "test" }
+    auditable_type { ApplicationRecord }
     action { "update" }
 
     trait :with_diff do
diff --git a/test/integration/hostgroup_js_test.rb b/test/integration/hostgroup_js_test.rb
index 7873e90fba7..1ef4dca91ac 100644
--- a/test/integration/hostgroup_js_test.rb
+++ b/test/integration/hostgroup_js_test.rb
@@ -23,8 +23,9 @@ class HostgroupJSTest < IntegrationTestWithJavascript
     select2 os.ptables.first.name, :from => 'hostgroup_ptable_id'
     fill_in 'hostgroup_root_pass', :with => '12345678'
     click_button 'Submit'
-
-    hostgroup = Hostgroup.where(:name => "myhostgroup1").first
+    hostgroup = wait_for do
+      Hostgroup.where(:name => "myhostgroup1").first
+    end
     refute_nil hostgroup
     assert_equal os.id, hostgroup.operatingsystem_id
     assert page.has_current_path? hostgroups_path
diff --git a/test/integration/org_admin_js_test.rb b/test/integration/org_admin_js_test.rb
index f6794fa6ea9..224f2c3063a 100644
--- a/test/integration/org_admin_js_test.rb
+++ b/test/integration/org_admin_js_test.rb
@@ -95,7 +95,9 @@ def test_org_admin_tries_to_create_domain_when_unselect_the_organization
       ensure_selected_option_of_multiselect(@org1.name, select_id: 'domain_organization_ids')
       page.click_button 'Submit'
 
-      created_domain = Domain.unscoped.find_by_name(domain.name)
+      created_domain = wait_for do
+        Domain.unscoped.find_by_name(domain.name)
+      end
       # sets the only organization anyway
       assert_equal [@org1], created_domain.organizations
     end
diff --git a/test/unit/foreman/access_control_test.rb b/test/unit/foreman/access_control_test.rb
index f8738c02a28..7676c153a4c 100644
--- a/test/unit/foreman/access_control_test.rb
+++ b/test/unit/foreman/access_control_test.rb
@@ -1,5 +1,4 @@
 require 'test_helper'
-require 'foreman/access_control'
 
 class AccessControlTest < ActiveSupport::TestCase
   test '#path_hash_to_string reads controller and action' do
diff --git a/test/unit/foreman/cast_test.rb b/test/unit/foreman/cast_test.rb
index 64242f3ad92..2faed02b8e9 100644
--- a/test/unit/foreman/cast_test.rb
+++ b/test/unit/foreman/cast_test.rb
@@ -1,5 +1,4 @@
 require 'test_helper'
-require 'foreman/cast'
 
 class CastTest < ActiveSupport::TestCase
   include Foreman::Cast
diff --git a/test/unit/has_many_common_test.rb b/test/unit/has_many_common_test.rb
index ba79aaed563..8947e46739f 100644
--- a/test/unit/has_many_common_test.rb
+++ b/test/unit/has_many_common_test.rb
@@ -92,7 +92,7 @@ class HasManyCommonTest < ActiveSupport::TestCase
 
   ## Test name methods resolve for Plugin AR objects
   class ::FakePlugin; end
-  class ::FakePlugin::FakeModel; end
+  class ::FakePlugin::FakeModel < ApplicationRecord; end
 
   test "should return plugin associations" do
     Host::Managed.class_eval do
diff --git a/test/unit/shared/access_permissions_test_base.rb b/test/unit/shared/access_permissions_test_base.rb
index 5f697389ae8..d4cfd0ecbbd 100644
--- a/test/unit/shared/access_permissions_test_base.rb
+++ b/test/unit/shared/access_permissions_test_base.rb
@@ -1,5 +1,3 @@
-require 'foreman/access_control'
-
 module AccessPermissionsTestBase
   extend ActiveSupport::Concern