IRC log of #zope3-dev for Monday, 2009-01-05

« Sunday, 2009-01-04 Index Tuesday, 2009-01-06 »
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pyqwerHi, does anyone know if it's allowed to store a normal list into a session object (persistent session data container)?16:14
pyqwerI do something like this: mysession['mylist'].append('xyz'); mysession['mylist'].append('abc')16:15
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pyqwerAn I have a page template that displays this list - what's weird is, that the second entry is not always displayed, if I hit the reload button.16:16
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thekryzwow16:33
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mcdoncpyqwer: you want to do instead19:06
mcdoncL = mysession.get('mylist', []); L.append('xyz'); mysession['mylist'] = L19:07
mcdonce.g. make sure the session object's __setitem__ is called19:07
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pyqwermcdonc: Hmmm, but where's the difference to mysession.setdefault ?19:11
mcdoncbecause with setdefault you mutate it after you set it19:12
mcdoncyou need to call __setitem__ after every mutation19:12
pyqwerAh, I see.19:12
mcdonc(for nonpersistent mutable objects)19:12
pyqwerAnd if I use PersistentList instead, I don't have this problem, right?19:12
mcdoncright19:14
pyqwerWhat I furthermore wonder is, that there's a difference between a normal page load and a page reload, any clue why that happens?19:14
mcdoncpage?19:14
pyqwer(So, if you just enter the URL in the browser and press <enter>, in comparison to pressing the reload button)19:14
mcdoncwhat about it?19:15
pyqwerIn my example, I did something like that: mysession['mylist'] = []; mysession['mylist'].append('A'), mysession['mylist'].append('B'), mysession['mylist'].append('C').19:16
pyqwer(Which is not allowed as __setitem__ is not called, I assume).19:16
pyqwerNevertheless, when I afterwards do a page load and display the list contents, it looks good.19:16
mcdoncoh19:16
pyqwerBut when I press "Reload", it displays something like ['A'] or ['A','B'], but not ['A','B','C']19:16
pyqwerSo I'm wondering where the difference between page load/reload is.19:17
mcdoncright... well, it's not connected to page loads vs. reloads in any hard-and-fast way, but when you mutate a nonpersistent object, the changes will stick around for some period of time, until the object is "ghosted" (removed from memory)... when it's loaded back from the zodb again ("unghosted"), the changes will be gone19:17
mcdonczodb has an object cache19:18
mcdoncand essentially what's happening is that your changes stick around while the object is still in the cache19:18
mcdoncbut disappear when it's evicted19:18
pyqwerAh, I see, so therefore I sometimes see these "ghost" data.19:18
mcdonchow that's related to page loads, i dunno, but that's what's happening under the covers19:18
mcdoncyeah19:18
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pyqwerOk, that explains, why - when I restart the instance, only ['A'] is available.19:19
mcdoncright... yeah, the changes are just in memory for some period of time, but they didnt get persisted19:19
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pyqwerI assume, the same thing applies to dictionaries, hence, PersistentDict should be used instead?19:19
mcdoncpyqwer: i almost never use persistentlist or persistentdict personally (i just obey the rules of persistence "by hand") but that would be one thing to do19:20
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pyqwermcdonc: Ok, many thinks, I got it, I think!19:21
mcdoncpyqwer: good!19:21
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