IRC log of #zope for Wednesday, 2013-02-27

« Tuesday, 2013-02-26 Index Thursday, 2013-02-28 »
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hoRnHi.01:03
hoRna short dumb question from a frontend gui writing some code in python: if I have a object and set it to a other context in zodb with _setObject this seems to be a reference - both are similar and editing affects both. Can I use this like 'symlink' or do I waste my ZODB with this?.01:08
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RichyBhoRn: if the object that you're referring to is Persistent, then two different references to it inside the ZODB will both point to the same object correctly.01:27
RichyB(i.e. it should usually be a subclass of Persistent, or or something like SimpleItem that subclasses Persistent)01:27
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RichyBHowever, I believe that if the object that you are referring to from two different references in the ZODB is not a Persistent object then… you will get just one copy shared by both for a little while and it'll appear to work, but as soon as your ZODB-using process restarts or the referring objects fall out of the ZODB cache, you'll get two completely separate copies of the same referred-to object which don't share memory nor any updates.01:31
RichyBI should double-check that behaviour.01:31
RichyBIn the ZODB, you generally want to only refer to objects that are either immutable, like strings, numbers and tuples, or that are Persistent.01:31
RichyBhoRn: but provided you make sure that classes descend from Persistent, sure, you can have shared references to a single object in ZODB. http://blog.startifact.com/posts/older/a-misconception-about-the-zodb.html01:32
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hoRnRichyB: Thanks for clarification - I will check this and read the recommended post ...02:31
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moumoutteHello all12:42
moumoutteI'm trying to use zope.sqlalchemy12:42
moumouttewith ZopeTransactionExtension12:42
moumoutteand I saw the new option12:42
moumouttekeep_session12:43
moumoutteI'm trying to using it12:43
moumoutteAnd its seems to work fine12:43
moumoutteBut12:43
moumoutteAt one moment the transaction.commit() expire all the object in session12:43
moumouttethere is any reason to do that ?12:43
moumoutteBecause in all the program the transaction.commit() maintains the object in session12:44
moumouttebut in one particular moment, It does'nt.12:44
moumouttehttp://paste.lisp.org/display/13566912:46
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