Move observers initialization to after_config blocks, they are still being initialized to early (before load paths are being set).

activerecord/lib/active_record/railtie.rb

@@ -70,20 +70,6 @@ class Railtie < Rails::Railtie
       end
     end
 
-    initializer "active_record.add_observer_hook", :after=>"active_record.set_configs" do |app|
-      ActiveSupport.on_load(:active_record) do
-        ActionDispatch::Callbacks.to_prepare(:activerecord_instantiate_observers) do
-          ActiveRecord::Base.instantiate_observers
-        end
-      end
-    end
-
-    initializer "active_record.instantiate_observers", :after=>"active_record.initialize_database" do
-      ActiveSupport.on_load(:active_record) do
-        instantiate_observers
-      end
-    end
-
     initializer "active_record.set_dispatch_hooks", :before => :set_clear_dependencies_hook do |app|
       ActiveSupport.on_load(:active_record) do
         unless app.config.cache_classes
@@ -94,5 +80,15 @@ class Railtie < Rails::Railtie
         end
       end
     end
+
+    config.after_initialize do
+      ActiveSupport.on_load(:active_record) do
+        instantiate_observers
+
+        ActionDispatch::Callbacks.to_prepare(:activerecord_instantiate_observers) do
+          ActiveRecord::Base.instantiate_observers
+        end
+      end
+    end
   end
 end