Django 'migrate' command suggesting errors related to packages - python-3.x

Question

I am new to Django and python and am presently taking a course on full stack web development, after following the course exactly the way it shows I have typed the following code within the models.py file:
from django.db import models
# Create your models here.
class Topic(models.Model):
top_name = models.CharField(max_length=264,unique=True)
def __str__(self):
return self.top_name
class Webpage(models.Model):
topic = models.ForeignKey(Topic)
name = models.CharField(max_length=264,unique=True)
url = models.URLField(unique=True)
def __str__(self):
return self.name
class AccessRecord(models.Model):
name = models.ForeignKey(Webpage)
date = models.DateField()
def __str__(self):
return str(self.date)
And have tried to execute the command:
python manage.py migrate
The following is the error I get when calling this command:
Traceback (most recent call last):
File "C:\Users\Naseem\desktop\my_django_stuff\first_project\manage.py", line 22, in <module>
main()
File "C:\Users\Naseem\desktop\my_django_stuff\first_project\manage.py", line 18, in main
execute_from_command_line(sys.argv)
File "C:\Users\Naseem\anaconda3\envs\MyDjangoEnv\lib\site-packages\django\core\management\__init__.py", line 419, in execute_from_command_line
utility.execute()
File "C:\Users\Naseem\anaconda3\envs\MyDjangoEnv\lib\site-packages\django\core\management\__init__.py", line 395, in execute
django.setup()
File "C:\Users\Naseem\anaconda3\envs\MyDjangoEnv\lib\site-packages\django\__init__.py", line 24, in setup
apps.populate(settings.INSTALLED_APPS)
File "C:\Users\Naseem\anaconda3\envs\MyDjangoEnv\lib\site-packages\django\apps\registry.py", line 91, in populate
app_config = AppConfig.create(entry)
File "C:\Users\Naseem\anaconda3\envs\MyDjangoEnv\lib\site-packages\django\apps\config.py", line 224, in create
import_module(entry)
File "C:\Users\Naseem\anaconda3\envs\MyDjangoEnv\lib\importlib\__init__.py", line 127, in import_module
return _bootstrap._gcd_import(name[level:], package, level)
File "<frozen importlib._bootstrap>", line 1030, in _gcd_import
File "<frozen importlib._bootstrap>", line 1007, in _find_and_load
File "<frozen importlib._bootstrap>", line 984, in _find_and_load_unlocked
The following is the settings.py file, installed_apps:
INSTALLED_APPS = [
'django.contrib.admin',
'django.contrib.auth',
'django.contrib.contenttypes',
'django.contrib.sessions',
'django.contrib.messages',
'django.contrib.staticfiles',
'first_app',
]
And the admin.py file:
from django.contrib import admin
The course showed the models.py file working without adding anything to admin.py, I am not sure why it is showing these errors.

Answer 1

When using foreign keys in your models, you have to set the on_delete parameter so django knows what to do with the entries when the model entry your foreign key is pointing to is deleted.
You could fix your models.py like this:
# Create your models here.
class Topic(models.Model):
top_name = models.CharField(max_length=264,unique=True)
def __str__(self):
return self.top_name
class Webpage(models.Model):
topic = models.ForeignKey(Topic, on_delete=models.CASCADE)
name = models.CharField(max_length=264,unique=True)
url = models.URLField(unique=True)
def __str__(self):
return self.name
class AccessRecord(models.Model):
name = models.ForeignKey(Webpage, on_delete=models.CASCADE)
date = models.DateField()
def __str__(self):
return str(self.date)
You can read more about the different choices you have for this field here and what they are doing.

Answer 2

First of all, in your installed_app list write
INSTALLED_APPS = [
.........
'first_app.apps.FirstAppConfig',
]
insted of just 'first_app'
then in admin.py file add this
from django.contrib import admin
from .models import *
myModels = [models.modelname, models.modelname.......]
admin.site.register(myModels)
then in your cmd first write
python manage.py makemigrations
and then write
python manage.py migrate
Hope this will work.