Django module object is not iterable

Question

I'm currently trying to build a blog using Django. I've been facing this error for a few hours now. I'm not quite sure if this has anything to do with the directories but the error occurs when I try to register my model in the admin.py file.

from django.contrib import admin
from .models import Post

# Register models
admin.site.register(Post)

The directories look as follows:

blog
   models
        Post
        Category
   admin.py
settings
static
templates

Trace:

Unhandled exception in thread started by <function check_errors.<locals>.wrapper at 0x7ffb589a67b8>
Traceback (most recent call last):
  File "/usr/lib/python3.6/site-packages/django/utils/autoreload.py", line 225, in wrapper
    fn(*args, **kwargs)
  File "/usr/lib/python3.6/site-packages/django/core/management/commands/runserver.py", line 112, in inner_run
    autoreload.raise_last_exception()
  File "/usr/lib/python3.6/site-packages/django/utils/autoreload.py", line 248, in raise_last_exception
    raise _exception[1]
  File "/usr/lib/python3.6/site-packages/django/core/management/__init__.py", line 327, in execute
    autoreload.check_errors(django.setup)()
  File "/usr/lib/python3.6/site-packages/django/utils/autoreload.py", line 225, in wrapper
    fn(*args, **kwargs)
  File "/usr/lib/python3.6/site-packages/django/__init__.py", line 24, in setup
    apps.populate(settings.INSTALLED_APPS)
  File "/usr/lib/python3.6/site-packages/django/apps/registry.py", line 120, in populate
    app_config.ready()
  File "/usr/lib/python3.6/site-packages/django/contrib/admin/apps.py", line 23, in ready
    self.module.autodiscover()
  File "/usr/lib/python3.6/site-packages/django/contrib/admin/__init__.py", line 26, in autodiscover
    autodiscover_modules('admin', register_to=site)
  File "/usr/lib/python3.6/site-packages/django/utils/module_loading.py", line 47, in autodiscover_modules
    import_module('%s.%s' % (app_config.name, module_to_search))
  File "/usr/lib/python3.6/importlib/__init__.py", line 126, in import_module
    return _bootstrap._gcd_import(name[level:], package, level)
  File "<frozen importlib._bootstrap>", line 994, in _gcd_import
  File "<frozen importlib._bootstrap>", line 971, in _find_and_load
  File "<frozen importlib._bootstrap>", line 955, in _find_and_load_unlocked
  File "<frozen importlib._bootstrap>", line 665, in _load_unlocked
  File "<frozen importlib._bootstrap_external>", line 678, in exec_module
  File "<frozen importlib._bootstrap>", line 219, in _call_with_frames_removed
  File "/home/hallak/Projects/hallak.io/hallak_blog/admin.py", line 5, in <module>
    admin.site.register(Post)
  File "/usr/lib/python3.6/site-packages/django/contrib/admin/sites.py", line 102, in register
    for model in model_or_iterable:
TypeError: 'module' object is not iterable

Post:

from django.db import models
from django.utils import timezone


class Post(models.Model):
    # Auto-generated ID
    id = models.AutoField(primary_key=True)

    # Title
    title = models.CharField(max_length=100)

    # Slug
    slug = models.SlugField(max_length=100)

    # Content
    body = models.TextField()

    # Timestamps
    created_on = models.DateField(auto_now_add=True)
    published_on = models.DateTimeField(blank=True, null=True)

    # Category
    category = models.ForeignKey('.Category', on_delete=models.DO_NOTHING)

    # Author
    author = models.ForeignKey('auth.User', on_delete=models.DO_NOTHING)

    # Publish post
    def publish(self):
        self.published_date = timezone.now()
        self.save()

    def __str__(self):
        return self.title

Category:

from django.db import models


class Category(models.Model):
    # Auto-generated ID
    id = models.AutoField(primary_key=True)

    # Title
    title = models.CharField(max_length=100)

    # Slug
    slug = models.SlugField(max_length=100)

    # Timestamps
    created_on = models.DateField(auto_now_add=True)

The error is happening here: https://github.com/django/django/blob/master/django/contrib/admin/sites.py#L100-L101

Whenever I comment the register line everything works fine.

Answer 1

Instead of writing "from .models import Post" you should write "from .models.Post import Post".

First "Post" is a modulename (file name), second one is a class name.