3 files changed, 7 insertions, 3 deletions
diff --git a/activerecord/lib/active_record/connection_adapters/postgresql/oid/array.rb b/activerecord/lib/active_record/connection_adapters/postgresql/oid/array.rb
index 3de794f797..25961a9869 100644
--- a/activerecord/lib/active_record/connection_adapters/postgresql/oid/array.rb
+++ b/activerecord/lib/active_record/connection_adapters/postgresql/oid/array.rb
@@ -45,6 +45,11 @@ module ActiveRecord
               delimiter == other.delimiter
           end
 
+          def type_cast_for_schema(value)
+            return super unless value.is_a?(::Array)
+            "[" + value.map { |v| subtype.type_cast_for_schema(v) }.join(", ") + "]"
+          end
+
           private
 
           def type_cast_array(value, method)
diff --git a/activerecord/lib/active_record/persistence.rb b/activerecord/lib/active_record/persistence.rb
index 437ba31711..0a6e4ac0bd 100644
--- a/activerecord/lib/active_record/persistence.rb
+++ b/activerecord/lib/active_record/persistence.rb
@@ -211,8 +211,7 @@ module ActiveRecord
     def becomes(klass)
       became = klass.new
       became.instance_variable_set("@attributes", @attributes)
-      changed_attributes = @changed_attributes if defined?(@changed_attributes)
-      became.instance_variable_set("@changed_attributes", changed_attributes || {})
+      became.instance_variable_set("@changed_attributes", attributes_changed_by_setter)
       became.instance_variable_set("@new_record", new_record?)
       became.instance_variable_set("@destroyed", destroyed?)
       became.instance_variable_set("@errors", errors)
diff --git a/activerecord/lib/active_record/railtie.rb b/activerecord/lib/active_record/railtie.rb
index 5af64b717a..da6b8447d3 100644
--- a/activerecord/lib/active_record/railtie.rb
+++ b/activerecord/lib/active_record/railtie.rb
@@ -156,8 +156,8 @@ end_warning
       ActiveSupport.on_load(:active_record) do
         ActionDispatch::Reloader.send(hook) do
           if ActiveRecord::Base.connected?
-            ActiveRecord::Base.clear_reloadable_connections!
             ActiveRecord::Base.clear_cache!
+            ActiveRecord::Base.clear_reloadable_connections!
           end
         end
       end