[Sqlalchemy-tickets] Issue #3852: deepcopy on CollectionAdapter result in exception (zzzeek/sqlalchemy)

[ilan.gadassi <iss...@bi...>]

New issue 3852: deepcopy on CollectionAdapter result in exception
https://bitbucket.org/zzzeek/sqlalchemy/issues/3852/deepcopy-on-collectionadapter-result-in

ilan.gadassi:

version 
------------
SQLAlchemy (1.1.3)

Description
------------------
while calling deepcopy(destinationModel)  
i get the following exception 


```
#!python

File "research/detectors/tests/test_cnc_detector.py", line 391
in test_extend
    res = an.get_extension(Tick())
File "research/detectors/cnc_detector.py", line 271
in get_extension
    updated_destinations = deepcopy(self.destinations)
File "/anaconda/lib/python2.7/copy.py", line 190
in deepcopy
    y = _reconstruct(x, rv, 1, memo)
File "/anaconda/lib/python2.7/copy.py", line 352
in _reconstruct
    y.append(item)
File "/anaconda/lib/python2.7/site-packages/sqlalchemy/orm/collections.py", line 1043
in append
    item = __set(self, item, _sa_initiator)
File "/anaconda/lib/python2.7/site-packages/sqlalchemy/orm/collections.py", line 1015
in __set
    item = executor.fire_append_event(item, _sa_initiator)
File "/anaconda/lib/python2.7/site-packages/sqlalchemy/orm/collections.py", line 678
in fire_append_event
    if self.invalidated:
E   AttributeError: invalidated
```

the 
   destinationModel is of type InstrumentedList 

it seems that the deepcopy doesnt copy the invalidated attribute due to the CollectionAdapter.__getstate__
the invalidated attribute is used by  CollectionAdapter.fire_append_event