Hi!
Your Posting says:
name=models.IntegerField()
Thats an Integer field thats can hold numbers like 1 or 98722
But then you do this:
Group.objects.filter(name='blah')
'blah' is an Character-String and not an Number.
I belive that the name should contains something with letters so you shoud
change it to
name=models.CharField(max_length=50)
or maybe
name=models.SlugField()
The whole thing you are doing here looks pretty much like the contrib.auth
module in Django.
Maybe you shound use this instead, it saves you lot of redudant work.
(D.R.Y.!)
On Wed, 22 Apr 2009 06:33:28 -0700 (PDT), robin <robinc...@gmail.com>
wrote:
> I have an unexplainable problem involving importing from 3 apps and
> one python script.
> Thank you to those who took the time to understand this problem.
>
> Sorry I cannot explain this problem, I tried to make it as simple as
> possible below.
>
> 'acc' has many 'numbers' which has a one-to-one relationship with
> 'two'.
>
> 'python run.py' tries to import from 'numbers' but causes import
> errors when 'acc' modelchoicefield queryset changes from 'all' to
> 'filter'
>
> ----------------acc/models.py--------------
>
> from django.db import models
> from django import forms
>
> class Group(models.Model):
> name=models.IntegerField()
>
> class User(models.Model):
> group=models.ForeignKey(Group)
>
> class UserForm(forms.ModelForm):
> group=forms.ModelChoiceField(Group.objects.all()) #causes problem if
> changed to Group.objects.filter(name='blah')
> class Meta:
> model=User
>
> ----------------number/models.py------------
>
> from django.db import models
> from acc.models import User
>
> class Number(models.Model):
> name=models.IntegerField()
>
> -------------------two/models.py-----------------
>
> from django.db import models
> from numbers.models import Number
>
> class Two(models.Model):
> number=models.OneToOneField(Number,primary_key=True) #potential
> problem line
>
> ---------------run.py-----------------------
>
> #!/usr/bin/env python
> from django.core.management import setup_environ
> import settings
> setup_environ(settings)
> from numbers.models import Number
>
> #######PROBLEM-#######
>
> With the above setup, if i execute: python run.py, it should be fine.
> BUT the problem occurs the moment i change acc.models from:
>
> group=forms.ModelChoiceField(Group.objects.all())
> #TO#
> group=forms.ModelChoiceField(Group.objects.filter(name='blah'))
>
> The last error it will show is:
>
> File "/home/robin/test/toast/two/models.py", line 2, in <module>
> from numbers.models import Number
> ImportError: cannot import name Number
>
>
> Thanks a lot,
> Robin
>
>
> The complete errors are below:
>
> Traceback (most recent call last):
> File "expire_listing.py", line 6, in <module>
> from numbers.models import Number
> File "/home/robin/test/toast/numbers/models.py", line 2, in <module>
> from acc.models import User
> File "/home/robin/test/toast/acc/models.py", line 11, in <module>
> class UserForm(forms.ModelForm):
> File "/home/robin/test/toast/acc/models.py", line 12, in UserForm
> group=forms.ModelChoiceField(Group.objects.filter(name__in=[0,1]))
> File "/usr/lib/python2.5/site-packages/django/db/models/manager.py",
> line 102, in filter
> return self.get_query_set().filter(*args, **kwargs)
> File "/usr/lib/python2.5/site-packages/django/db/models/query.py",
> line 489, in filter
> return self._filter_or_exclude(False, *args, **kwargs)
> File "/usr/lib/python2.5/site-packages/django/db/models/query.py",
> line 507, in _filter_or_exclude
> clone.query.add_q(Q(*args, **kwargs))
> File "/usr/lib/python2.5/site-packages/django/db/models/sql/
> query.py", line 1258, in add_q
> can_reuse=used_aliases)
> File "/usr/lib/python2.5/site-packages/django/db/models/sql/
> query.py", line 1133, in add_filter
> negate=negate, process_extras=process_extras)
> File "/usr/lib/python2.5/site-packages/django/db/models/sql/
> query.py", line 1309, in setup_joins
> field, model, direct, m2m = opts.get_field_by_name(name)
> File "/usr/lib/python2.5/site-packages/django/db/models/options.py",
> line 281, in get_field_by_name
> cache = self.init_name_map()
> File "/usr/lib/python2.5/site-packages/django/db/models/options.py",
> line 311, in init_name_map
> for f, model in self.get_all_related_m2m_objects_with_model():
> File "/usr/lib/python2.5/site-packages/django/db/models/options.py",
> line 388, in get_all_related_m2m_objects_with_model
> cache = self._fill_related_many_to_many_cache()
> File "/usr/lib/python2.5/site-packages/django/db/models/options.py",
> line 402, in _fill_related_many_to_many_cache
> for klass in get_models():
> File "/usr/lib/python2.5/site-packages/django/db/models/loading.py",
> line 136, in get_models
> self._populate()
> File "/usr/lib/python2.5/site-packages/django/db/models/loading.py",
> line 57, in _populate
> self.load_app(app_name, True)
> File "/usr/lib/python2.5/site-packages/django/db/models/loading.py",
> line 72, in load_app
> mod = __import__(app_name, {}, {}, ['models'])
> File "/home/robin/test/toast/two/models.py", line 2, in <module>
> from numbers.models import Number
> ImportError: cannot import name Number
>
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