Re: Do MappingStorage is able to solve conflicts

MappingStorage does not extend ConflictResolvingStorage and I wouldn't expect it to resolve conflicts.

If you want an in-memory storage that does resolve conflicts, try DemoStorage (if not given a base or changes storage, it uses MappingStorage objects).

> On Oct 12, 2018, at 05:02, Éloi Rivard <[email protected]> wrote:
> 
> Hi. I have a very simple piece of code with a different behavior depending on it is running on a MappingStorage or a ClientStorage. Conflicts do not seem to be solved when I use a MappingStorage.
> 
> import ZODB, transaction, persistent
> from ZEO.ClientStorage import ClientStorage
> 
> class MyMapping(persistent.mapping.PersistentMapping):
>     def _p_resolveConflict(self, old, saved, new):
>         return {"conflict": "happened"}
> 
> 
> db = ZODB.DB(None)
> #db = ZODB.DB(ClientStorage(("localhost", 9999)))
> with db.transaction() as conn:
>     conn.root.x = MyMapping()
> 
> my_transaction_manager = transaction.TransactionManager()
> conn1 = db.open(my_transaction_manager)
> my_transaction_manager.commit()
> 
> with db.transaction() as conn2:
>     conn2.root.x["a"] = 1
> 
> conn1.root.x["b"] = 2
> my_transaction_manager.commit()
> 
> This piece of code is stupid, but just shows that a conflict is raised with a MappingStorage, and not with a ClientStorage.
> 
> Éloi
> 
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