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| valleedelisle | ping zope I'm new to ZODB and for some reason, when I save an objects created with Persistence.Persistent, only the key name is saved in the ZODB, not the objects attributes | 17:36 |
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| mgedmin | valleedelisle: pastebin your code please | 17:36 |
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| valleedelisle | mgedmin, https://pastebin.com/az7Ky7ww | 17:43 |
| valleedelisle | so cases=case_db.root["cases"] returns a dict with keys defined, but the objects are all empty | 17:43 |
| valleedelisle | that's the problem | 17:43 |
| mgedmin | valleedelisle: careful about accessing self.__dict__ directly in Persistent objects | 17:44 |
| mgedmin | this sidesteps the Persistent machinery that notices changes | 17:44 |
| mgedmin | and thus changes get lost | 17:44 |
| valleedelisle | oh | 17:44 |
| valleedelisle | that makes sense | 17:44 |
| mgedmin | be sure to set self._p_changed = True afterwards | 17:44 |
| mgedmin | do read the documentation, this is explained somewhere, I'm sure | 17:44 |
| valleedelisle | ack, will do | 17:45 |
| mgedmin | there are more gotchas you should know about! | 17:45 |
| mgedmin | also, starting a python 2 project in 2018 is risky | 17:45 |
| mgedmin | python 2 end-of-life is scheduled for jan 1 2020 | 17:45 |
| mgedmin | migrating ZODB databases from python 2 to python 3 is a non-trivial problem that requires very custom code, tailored to a specific application | 17:46 |
| valleedelisle | mgedmin, yeah I think I had problems with instance the persistence module in python3 | 17:46 |
| mgedmin | you may safe yourself future trouble if you start on python 3 | 17:46 |
| valleedelisle | this is not going to be a huge project, it's just a little tool we need | 17:46 |
| valleedelisle | * said everyone that worked on a huge project | 17:47 |
| valleedelisle | mgedmin, even with _p_changed = True, the attributes are not saved | 17:48 |
| valleedelisle | mgedmin, how do you recommend dynamic attributes with Persistent ? Loop through kwargs and setattr ? | 17:49 |
| mgedmin | kwargs + setattr seems fine | 17:50 |
| valleedelisle | mgedmin, yeah even with this it doesnt work | 17:51 |
| mgedmin | ok, the other issue | 17:51 |
| mgedmin | case_db.root["cases"] = {} | 17:51 |
| mgedmin | you see that {}? that's a dict | 17:51 |
| valleedelisle | yup | 17:51 |
| mgedmin | the persistence machinery cannot see dict modifications (or list modifications, etc) | 17:51 |
| valleedelisle | oh yeah I read that somewhere | 17:51 |
| mgedmin | so whenever you change it, you have to do case_db.root["cases"] = case_db.root["cases"] or something similar | 17:51 |
| mgedmin | or you could use persistent.dict.PersistentDict() instead of {} and it would JustWork | 17:52 |
| mgedmin | (or you could/should use a BTree, if this dict is expected to grow large -- say more than 100 items) | 17:52 |
| betabug | BTree is what we use for those cases | 17:52 |
| mgedmin | this sort of detail is why I recommended reading the documentation | 17:52 |
| betabug | no matter if it's expected to grow or not | 17:52 |
| betabug | just use BTree and the one time where it will grow and you didn't expect it, you're still covered | 17:53 |
| mgedmin | hm, I see you already repeat the root["cases"] = cases before your transaction.commit() | 17:53 |
| mgedmin | so I don't understand what's not getting persisted | 17:54 |
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| valleedelisle | mgedmin, I tried to self.connection.setDebugInfo(True) | 17:58 |
| valleedelisle | mgedmin, but I don't get more information | 17:58 |
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| mgedmin | no idea what that is | 17:59 |
| valleedelisle | mgedmin, I found that in the doc, actually, that's the only thing about debug in the ZODB doc | 17:59 |
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