It would be safer to also use base64.encodestring(pickle.dumps(python_data)) and pickle.loads(base64.decodestring(db_data)) just like Django's db cache does. Pickle data is binary and is not good for TextField
On 17 дек, 15:08, Ned Batchelder <[EMAIL PROTECTED]> wrote: > If I understand what you're doing here, you need to be very careful. > Converting a dictionary to a string (or pickle) does not guarantee that > two equal dictionaries convert into two equal strings (or pickles), > especially if your version of Python changes. For example, your code > below may create a pickle with the key 'foo' first, or it may create a > pickle with the key 'bar' first. Both pickles un-pickle to an > equivalent dictionary, but the pickles won't compare as equal, and your > queries will fail. > > I could be wrong, and the pickle module provides some guarantee about > the equivalency of pickles, but I don't think so. > > --Ned.http://nedbatchelder.com/blog > > > > [EMAIL PROTECTED] wrote: > > I fixed this -- not Django's fault at all. For the full field code, go > > tohttp://www.djangosnippets.org/snippets/513/ > > > On Dec 13, 8:08 pm, "[EMAIL PROTECTED]" <[EMAIL PROTECTED]> wrote: > > >> Hey All, > > >> I've just written a custom model field for storing anything which is > >> pickle-able (generally this will be used for storing dictionaries). It > >> all works great, apart from when I want to perform a query on objects > >> using the field as an argument. When doing something like: > > >> SomeModel.objects.filter(my_field={'foo': 'bar', 'bar': 'baz'}) > > >> However, it seems to reduce my dictionary to an iterable containing > >> just the dictionary keys (so, in this case ['foo', 'bar']). I presume > >> Django is doing this by iterating over the dictionary, but obviously > >> this doesn't work for my field. Is there any way to stop Django from > >> doing this, away from overriding query methods in the manager to > >> convert the dictionary to something non-iterable? > > >> Any help much appreciated! > > >> Thanks, > >> O > > -- > Ned Batchelder,http://nedbatchelder.com --~--~---------~--~----~------------~-------~--~----~ You received this message because you are subscribed to the Google Groups "Django users" group. To post to this group, send email to django-users@googlegroups.com To unsubscribe from this group, send email to [EMAIL PROTECTED] For more options, visit this group at http://groups.google.com/group/django-users?hl=en -~----------~----~----~----~------~----~------~--~---
