1 files changed, 34 insertions, 3 deletions
diff --git a/activerecord/lib/active_record/railtie.rb b/activerecord/lib/active_record/railtie.rb
index 47351588d3..81ad9ef3a2 100644
--- a/activerecord/lib/active_record/railtie.rb
+++ b/activerecord/lib/active_record/railtie.rb
@@ -88,6 +88,31 @@ module ActiveRecord
       end
     end
 
+    initializer "Check for cache versioning support" do
+      config.after_initialize do |app|
+        ActiveSupport.on_load(:active_record) do
+          if app.config.active_record.cache_versioning && Rails.cache
+            unless Rails.cache.class.try(:supports_cache_versioning?)
+              raise <<-end_error
+
+You're using a cache store that doesn't support native cache versioning.
+Your best option is to upgrade to a newer version of #{Rails.cache.class}
+that supports cache versioning (#{Rails.cache.class}.supports_cache_versioning? #=> true).
+
+Next best, switch to a different cache store that does support cache versioning:
+https://guides.rubyonrails.org/caching_with_rails.html#cache-stores.
+
+To keep using the current cache store, you can turn off cache versioning entirely:
+
+    config.active_record.cache_versioning = false
+
+end_error
+            end
+          end
+        end
+      end
+    end
+
     initializer "active_record.check_schema_cache_dump" do
       if config.active_record.delete(:use_schema_cache_dump)
         config.after_initialize do |app|
@@ -112,6 +137,14 @@ module ActiveRecord
       end
     end
 
+    initializer "active_record.define_attribute_methods" do |app|
+      config.after_initialize do
+        ActiveSupport.on_load(:active_record) do
+          descendants.each(&:define_attribute_methods) if app.config.eager_load
+        end
+      end
+    end
+
     initializer "active_record.warn_on_records_fetched_greater_than" do
       if config.active_record.warn_on_records_fetched_greater_than
         ActiveSupport.on_load(:active_record) do
@@ -180,9 +213,7 @@ end_warning
     end
 
     initializer "active_record.set_executor_hooks" do
-      ActiveSupport.on_load(:active_record) do
-        ActiveRecord::QueryCache.install_executor_hooks
-      end
+      ActiveRecord::QueryCache.install_executor_hooks
     end
 
     initializer "active_record.add_watchable_files" do |app|