Re: natural keys for auth.user and group
Hi, your above example helped me a lot, thank you! But there is a small error. natural_key must always return a tuple. So this part: def gnatural_key(self): return self.name def unatural_key(self): return self.username Has to be changed: def gnatural_key(self): return (self.name,) def unatural_key(self): return (self.username,) And this works perfectly fine. Thanks again, Anna Warzecha -- 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 django-users+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/django-users?hl=en.
Re: natural keys for auth.user and group
Unfortunately, according to the Django ticket for this (https://code.djangoproject.com/ticket/13914) it seems that we aren't going to get this functionality built-in any time soon. However, after many hours of inspection in the Django source, I think I have found a solution... 1. In Django 1.3 the User model already has it's own UserManager, so we must update that instead of overwriting it. This makes adding natural keys for Users much easier. 2. The ValidationError is because it's not even trying to use the natural keys- this code uses private fields like _default_manager, which were initialised before the manager was replaced. In the end, since we are only adding a method and nothing else, the most appropriate way to fix this is to change the __class__ of the objects member in Group. 3. I don't appear to need add_to_class(), but YMMV. An example would be good. def uget_by_natural_key(self, username): return self.get(username=username) def gnatural_key(self): return self.name def unatural_key(self): return self.username class GroupManager(models.Manager): def get_by_natural_key(self, name): return self.get(name=name) UserManager.get_by_natural_key = uget_by_natural_key Group.objects.__class__ = GroupManager User.natural_key = unatural_key Group.natural_key = gnatural_key For reference, I put this code in models.py. Disclaimer: This kind of hackery may have serious side-effects, especially since Django has done a lot of initialisation by the time we get to this point. -- You received this message because you are subscribed to the Google Groups "Django users" group. To view this discussion on the web visit https://groups.google.com/d/msg/django-users/-/v5rH2CqDHHoJ. To post to this group, send email to django-users@googlegroups.com. To unsubscribe from this group, send email to django-users+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/django-users?hl=en.
Re: natural keys for auth.user and group
I fixed the earlier issue, which was happening during serialization, by using add_to_class() class method, but now I'm running into an issue with deserialize(): [...] for deobj in deserialize(fmt, val, ensure_ascii=False, use_natural_keys=True): File "/usr/local/lib/python2.6/dist-packages/django/core/serializers/ json.py", line 38, in Deserializer for obj in PythonDeserializer(simplejson.load(stream), **options): File "/usr/local/lib/python2.6/dist-packages/django/core/serializers/ python.py", line 127, in Deserializer data[field.attname] = field.rel.to._meta.get_field(field.rel.field_name).to_python(field_value) File "/usr/local/lib/python2.6/dist-packages/django/db/models/fields/ __init__.py", line 471, in to_python raise exceptions.ValidationError(self.error_messages['invalid']) django.core.exceptions.ValidationError: [u'This value must be an integer.'] This happens on a user value that's a natural key; in serializers/ python.py, the code looks for get_by_natural_key() method, does not find it and tries to process the id as int, which causes this exception. How can it be that dynamically updated manager works fine on serialization but not on deserialize? Thanks, any hints / ideas are appreciated. -ak -- 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 django-users+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/django-users?hl=en.
natural keys for auth.user and group
Hi, I know natural keys possibly will be added to auth.user and group in 1.4. I'm using 1.2 currently and I'm trying to add them dynamically: class UserManager(models.Manager): def get_by_natural_key(self, username, first_name): return self.get(username=username, first_name=first_name) class GroupManager(models.Manager): def get_by_natural_key(self, name): return self.get(name=name) def unatural_key(self): return (self.username, self.first_name) def gnatural_key(instance): return (self.name,) User.objects = UserManager() Group.objects = GroupManager() User.natural_key = unatural_key Group.natural_key = gnatural_key It seems like it should work.. (?) but I get this error when trying to serialize using natural keys: Traceback (most recent call last): File "data.py", line 362, in Backup().main() File "data.py", line 333, in main if options.dump: self.do_dump(default_datafile, self.classes) File "data.py", line 232, in do_dump use_natural_keys=True) File "/usr/local/lib/python2.6/dist-packages/django/core/serializers/ __init__.py", line 87, in serialize s.serialize(queryset, **options) File "/usr/local/lib/python2.6/dist-packages/django/core/serializers/ base.py", line 39, in serialize for obj in queryset: File "/usr/local/lib/python2.6/dist-packages/django/db/models/ query.py", line 106, in _result_iter self._fill_cache() File "/usr/local/lib/python2.6/dist-packages/django/db/models/ query.py", line 760, in _fill_cache self._result_cache.append(self._iter.next()) File "/usr/local/lib/python2.6/dist-packages/django/db/models/ query.py", line 230, in iterator fields = self.model._meta.fields AttributeError: 'NoneType' object has no attribute '_meta' Is there a way to do this without patching django? thanks, -ak -- 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 django-users+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/django-users?hl=en.
