On 09/27/06 16:45, Tom Smith wrote:
> Hello
>
> currently I am storing a list of python instances in the
> request.session but would like to make a persistent copy of this list
> and store it permanently...
>
> I don't want to just make the timeout of the session a long time in
> the future, because each user could have multiple lists of objects
> saved.
>
> How do I take a list of python instances and save them simply to a
> Table? Should I somehow serialize/pickle the list into a TEXT field
> or is there a better way?
>
> Thanks
>
> tom
The below class is from one of my projects. Works fine so far.
The data is first pickled, then base64 encoded, the result is then
stored in the db. By using the 'data' property instead of the real field
it all happens transparently.
I found some snippets that got me started in the code of the admin's
loginform implementation.
Hope this helps.
class PortletPreference(models.Model):
"""Persistant storage of portlet preferences.
"""
portlet = models.ForeignKey(Portlet, unique=True)
# don't access 'encoded_data' directly, use the 'data' property instead
encoded_data = models.TextField(_('Encoded Data.'), blank=True,
null=True)
def _get_data(self):
return self._decode(self.encoded_data)
def _set_data(self, data):
self.encoded_data = self._encode(data)
data = property(_get_data, _set_data)
def __str__(self):
return '%s' % self.portlet
class Meta:
verbose_name = _('PortletPreference')
verbose_name_plural = _('PortletPreferences')
def _decode(self, data):
pickled = base64.decodestring(data)
try:
return pickle.loads(pickled)
except:
return {}
def _encode(self, preferences_dict):
pickled = pickle.dumps(preferences_dict)
encoded_data = base64.encodestring(pickled)
return encoded_data
# Only for testing/debugging. This model should _not_ be edited in
the admin.
class Admin:
pass
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