AppRegistryNotReady: Models aren't loaded yet.

[Sabine Maennel]

Hello, please help!

Some of my models throw this error, when I query them with object.all(). They coexist in apps that have other models that are just fine. I do not understand at all what the problem might be and could not google it. 

For example: this would be my models.py in the app "account":

from django.db import models

from django.contrib.auth.models import User

from apps.courseevent.models import CourseParticipation

from apps.transaction.models import Transaction

from model_utils.fields import SplitField

from model_utils.models import TimeStampedModel

from money import Money

class UserStatus(TimeStampedModel):

    status_code = models.CharField(max_length=20)

    title = models.CharField(max_length=100)

    text = models.TextField()

    def __unicode__(self):

        return u"%s" % (self.title)

class UserAccount(TimeStampedModel):

    user = models.ForeignKey(User, unique=True)

    about = SplitField()

    status = models.ForeignKey(UserStatus)

    def __unicode__(self):

        return u"%s %s" % (self.user.first_name, self.user.last_name)

    def balance(self):

        balance = Money(amount='0.00', currency='EUR')

        transactions = Transaction.objects.filter(user=self.user_id)

        for transaction in transactions:

            try:

               transaction_value = Money(amount=transaction.total , currency='EUR' )

               balance = balance + transaction_value

            except:

               pass

        return balance

    def participation_level(self):

        try:

            CourseParticipation.objects.filter(participant=self.user_id,

                role = CourseParticipation.ROLE_TEACHER)

            return CourseParticipation.ROLE_TEACHER

        except:

            try:

                CourseParticipation.objects.filter(participant=self.user_id,

                    role = CourseParticipation.ROLE_STUDENT)

                return CourseParticipation.ROLE_STUDENT

            except:

                return None

Then I try to call them via the Python.shell:

>>>>from apps.account.models import UserStatus, UserAccount 

>>>>x =  UserStatus.objects.all()
>>>>y = UserAccount.objects.all()
>>>>print x
[<UserStatus: Angemeldet>, <UserStatus: Lehrer-Anwaerter>]
>>>>print y

Traceback (most recent call last):

  File "<input>", line 1, in <module>

  File "/Users/sabinemaennel/VirtualEnvs/netteachers/lib/python2.7/site-packages/django/db/models/query.py", line 119, in __repr__

    return repr(data)

  File "/Users/sabinemaennel/VirtualEnvs/netteachers/lib/python2.7/site-packages/django/db/models/base.py", line 459, in __repr__

    u = six.text_type(self)

  File "/Users/sabinemaennel/PycharmProjects/netteachers/apps/account/models.py", line 23, in __unicode__

    return u"%s %s" % (self.user.first_name, self.user.last_name)

  File "/Users/sabinemaennel/VirtualEnvs/netteachers/lib/python2.7/site-packages/django/db/models/fields/related.py", line 557, in __get__

    val = self.field.get_local_related_value(instance)

  File "/Users/sabinemaennel/VirtualEnvs/netteachers/lib/python2.7/site-packages/django/db/models/fields/related.py", line 1429, in get_local_related_value

    return self.get_instance_value_for_fields(instance, self.local_related_fields)

  File "/Users/sabinemaennel/VirtualEnvs/netteachers/lib/python2.7/site-packages/django/db/models/fields/related.py", line 1422, in local_related_fields

    return tuple(lhs_field for lhs_field, rhs_field in self.related_fields)

  File "/Users/sabinemaennel/VirtualEnvs/netteachers/lib/python2.7/site-packages/django/db/models/fields/related.py", line 1413, in related_fields

    self._related_fields = self.resolve_related_fields()

  File "/Users/sabinemaennel/VirtualEnvs/netteachers/lib/python2.7/site-packages/django/db/models/fields/related.py", line 1406, in resolve_related_fields

    else self.rel.to._meta.get_field_by_name(to_field_name)[0])

  File "/Users/sabinemaennel/VirtualEnvs/netteachers/lib/python2.7/site-packages/django/db/models/options.py", line 416, in get_field_by_name

    cache = self.init_name_map()

  File "/Users/sabinemaennel/VirtualEnvs/netteachers/lib/python2.7/site-packages/django/db/models/options.py", line 445, in init_name_map

    for f, model in self.get_all_related_m2m_objects_with_model():

  File "/Users/sabinemaennel/VirtualEnvs/netteachers/lib/python2.7/site-packages/django/db/models/options.py", line 563, in get_all_related_m2m_objects_with_model

    cache = self._fill_related_many_to_many_cache()

  File "/Users/sabinemaennel/VirtualEnvs/netteachers/lib/python2.7/site-packages/django/db/models/options.py", line 577, in _fill_related_many_to_many_cache

    for klass in self.apps.get_models():

  File "/Users/sabinemaennel/VirtualEnvs/netteachers/lib/python2.7/site-packages/django/utils/lru_cache.py", line 101, in wrapper

    result = user_function(*args, **kwds)

  File "/Users/sabinemaennel/VirtualEnvs/netteachers/lib/python2.7/site-packages/django/apps/registry.py", line 168, in get_models

    self.check_models_ready()

  File "/Users/sabinemaennel/VirtualEnvs/netteachers/lib/python2.7/site-packages/django/apps/registry.py", line 131, in check_models_ready

    raise AppRegistryNotReady("Models aren't loaded yet.")

AppRegistryNotReady: Models aren't loaded yet.

[Tom Evans]

On Wed, Sep 24, 2014 at 1:12 PM, Sabine Maennel
<sabine....@gmail.com> wrote:
> Hello, please help!
>
> Some of my models throw this error, when I query them with object.all().
> They coexist in apps that have other models that are just fine. I do not
> understand at all what the problem might be and could not google it.

The failure is when django attempts to generate the unicode
representation of that model in order to fill in references to related
objects on those instances.

File "/Users/sabinemaennel/PycharmProjects/netteachers/apps/account/models.py",
line 23, in __unicode__
return u"%s %s" % (self.user.first_name, self.user.last_name)
File "/Users/sabinemaennel/VirtualEnvs/netteachers/lib/python2.7/site-packages/django/db/models/fields/related.py",
line 557, in __get__
val = self.field.get_local_related_value(instance)

Specifically, it happens when you attempt to access the
UserAccount.user atttribute, which references the User model.

At this point, django complains that this app is not ready and the
models aren't loaded. Do you have 'django.contrib.auth' in
settings.INSTALLED_APPS?

Cheers

Tom

[Sabine Maennel]

Thank you Tom,

that was very helpful. It all works if I throw these unicode representations out. I do have  'django.contrib.auth' installed. 

I can play around with what representations to use now. But from the error message I would not have guessed that it had this reason. So again thanks very much, you saved my day!

        with kind regards

            Sabine

[Collin Anderson]

Are you using a plain python shell or ./manage.py shell? If you are using a plain python shell, you must call django.setup() first.

[Sabine Maennel]

I am using Pycharm and I did declare my project as a Django project. So how can call django.setup()? Do I do that in my settings-file?

On Wed, Sep 24, 2014 at 4:38 PM, Collin Anderson <cmawe...@gmail.com> wrote:

Are you using a plain python shell or ./manage.py shell? If you are using a plain python shell, you must call django.setup() first.

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Sabine Maennel

Leimbachstr. 223

8041 Zürich

Tel. +41 (0) 43 53 778 74

Mathematikerin / Softwareingenieurin

sabine....@gmail.com

Blog: http://sabinemaennel.ch

Startup: http://net-teachers.com

[Russell Keith-Magee]

Hi Sabine,

No - you don't put it in your settings file; the settings file is loaded as part of the setup call.

As a completely manual process, you can just run the following:

import django

django.setup()

as the first two commands in your Python shell. If PyCharm has any hooks you can tie into for providing shell startup logic, that would be a good place to put these two lines. 

Yours,

Russ Magee %-)

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[Sabine Maennel]

Thanks Rusell, that helps.

To view this discussion on the web visit https://groups.google.com/d/msgid/django-users/CAJxq84-f99%2BfSxV47JL9Y2rALf%3DP0Ed7XWoOcDtiADep5HaNQg%40mail.gmail.com.

For more options, visit https://groups.google.com/d/optout.