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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