Add missing items to collection.__getstate__

the refactor in b606e47ddc54 / ticket:3457 failed
to adjust __getstate__ / __setstate__.  need to memoize
a few more things including the class itself so that we
can navigate back to "attr".

Change-Id: I4ece2a616cb8b9dac7b50763ca59e47d0f26cfdf
Fixes: #3852

1 files changed, 7 insertions, 1 deletions

diff --git a/lib/sqlalchemy/orm/collections.py b/lib/sqlalchemy/orm/collections.py
index 1e022e1dd..47cd774d6 100644
--- a/lib/sqlalchemy/orm/collections.py
+++ b/lib/sqlalchemy/orm/collections.py
@@ -714,12 +714,18 @@ class CollectionAdapter(object):
     def __getstate__(self):
         return {'key': self._key,
                 'owner_state': self.owner_state,
-                'data': self.data}
+                'owner_cls': self.owner_state.class_,
+                'data': self.data,
+                'invalidated': self.invalidated}
 
     def __setstate__(self, d):
         self._key = d['key']
         self.owner_state = d['owner_state']
         self._data = weakref.ref(d['data'])
+        self._converter = d['data']._sa_converter
+        d['data']._sa_adapter = self
+        self.invalidated = d['invalidated']
+        self.attr = getattr(d['owner_cls'], self._key).impl
 
 
 def bulk_replace(values, existing_adapter, new_adapter):