Chapter 1 page 33 - Githubissues

I'm trying to add custom Manager to the Post model and getting the next traceback:

\Traceback (most recent call last):
  File "/home/alex/Code/django_4_by_example/blog/env/lib/python3.10/site-packages/django/db/models/options.py", line 654, in get_field
    return self._forward_fields_map[field_name]
KeyError: 'published'

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "/home/alex/Code/django_4_by_example/blog/mysite/manage.py", line 22, in <module>
    main()
  File "/home/alex/Code/django_4_by_example/blog/mysite/manage.py", line 18, in main
    execute_from_command_line(sys.argv)
  File "/home/alex/Code/django_4_by_example/blog/env/lib/python3.10/site-packages/django/core/management/__init__.py", line 446, in execute_from_command_line
    utility.execute()
  File "/home/alex/Code/django_4_by_example/blog/env/lib/python3.10/site-packages/django/core/management/__init__.py", line 420, in execute
    django.setup()
  File "/home/alex/Code/django_4_by_example/blog/env/lib/python3.10/site-packages/django/__init__.py", line 24, in setup
    apps.populate(settings.INSTALLED_APPS)
  File "/home/alex/Code/django_4_by_example/blog/env/lib/python3.10/site-packages/django/apps/registry.py", line 116, in populate
    app_config.import_models()
  File "/home/alex/Code/django_4_by_example/blog/env/lib/python3.10/site-packages/django/apps/config.py", line 269, in import_models
    self.models_module = import_module(models_module_name)
  File "/usr/lib/python3.10/importlib/__init__.py", line 126, in import_module
    return _bootstrap._gcd_import(name[level:], package, level)
  File "<frozen importlib._bootstrap>", line 1050, in _gcd_import
  File "<frozen importlib._bootstrap>", line 1027, in _find_and_load
  File "<frozen importlib._bootstrap>", line 1006, in _find_and_load_unlocked
  File "<frozen importlib._bootstrap>", line 688, in _load_unlocked
  File "<frozen importlib._bootstrap_external>", line 883, in exec_module
  File "<frozen importlib._bootstrap>", line 241, in _call_with_frames_removed
  File "/home/alex/Code/django_4_by_example/blog/mysite/blog/models.py", line 12, in <module>
    class Post(models.Model):
  File "/home/alex/Code/django_4_by_example/blog/env/lib/python3.10/site-packages/django/db/models/base.py", line 363, in __new__
    new_class._prepare()
  File "/home/alex/Code/django_4_by_example/blog/env/lib/python3.10/site-packages/django/db/models/base.py", line 424, in _prepare
    index.set_name_with_model(cls)
  File "/home/alex/Code/django_4_by_example/blog/env/lib/python3.10/site-packages/django/db/models/indexes.py", line 165, in set_name_with_model
    column_names = [
  File "/home/alex/Code/django_4_by_example/blog/env/lib/python3.10/site-packages/django/db/models/indexes.py", line 166, in <listcomp>
    model._meta.get_field(field_name).column
  File "/home/alex/Code/django_4_by_example/blog/env/lib/python3.10/site-packages/django/db/models/options.py", line 659, in get_field
    raise FieldDoesNotExist(
django.core.exceptions.FieldDoesNotExist: Post has no field named 'published'. The app cache isn't ready yet, so if this is an auto-created related field, it won't be available yet.
This is my models.py file:

from django.contrib.auth.models import User
from django.db import models
from django.utils import timezone

class PublishedManager(models.Manager):
    def get_queryset(self):
        return super().get_queryset()\
            .filter(status=Post.Status.PUBLISHED)

class Post(models.Model):

    class Status(models.TextChoices):
        DRAFT = 'DF', 'Draft'
        PUBLISHED = 'PB', 'Published'

    title = models.CharField(max_length=250)
    slug = models.SlugField(max_length=250)
    body = models.TextField()
    published = models.DateTimeField(default=timezone.now)
    created = models.DateTimeField(auto_now_add=True)
    updated = models.DateTimeField(auto_now=True)
    status = models.CharField(max_length=2,
                              choices=Status.choices,
                              default=Status.DRAFT)
    author = models.ForeignKey(User,
                               on_delete=models.CASCADE,
                               related_name="blog_posts")

    objects = models.Manager()
    published = PublishedManager()

    class Meta:
        ordering = ['-published']
        indexes = [
            models.Index(fields=['-published']),
        ]

    def __str__(self):
        return self.title

pip freeze
asgiref==3.5.2
autopep8==2.0.0
Django==4.1.3
pycodestyle==2.9.1
sqlparse==0.4.3
tomli==2.0.1

I've changed the status of one of my posts to 'published' in admin interface, so I have no idea why it is not working. The code is exactly as in the book.

PacktPublishing / Django-4-by-example

Chapter 1 page 33 #20