ActiveRecord->save_association() should use is_subclass_of(), not get_parent_class()

[Alderete]

In order to allow intermediate subclasses of ActiveRecord?, I propose that the save_association() method use is_subclass_of() instead of get_parent_class() to determine if the object is an ActiveRecord? and should be saved to the database.

Specifically, change line 1420 of active_record.php:

-  if(is_object($object) && get_parent_class($object) == __CLASS__ && $type) {		
+  if(is_object($object) && is_subclass_of($object, __CLASS__) && $type) {

Although normal usage of PHP on Trax does not require creating a subclass of ActiveRecord?, it is important for using ActiveRecord? in stand-alone mode. And it should make no difference to normal usage in Trax.

[sell]

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