Styjun

I have a basic django practice assignment for my Python courses. It is to write a model for the hypothetical Internet shop application. I have written a model but cannot submit it until it is checked properly by a compiler in the virtual environment. I am aware that as it is the code itself is imperfect from the point of view of business logic. But the compiler's mistake is the main thing now because I cannot move forward with it.
I have followed the django official tutorial to create a project. I have started the project and ran a server.
I wrote not so good code for the model and made migrations. Then I almost completely rewrote it and tried to use manage.py shell. But now the compiler gave a mistake. It was the django.core raising one of its errors concerning the settings file. It didn't work out and thought I have to make migrations again. Now it gave the db API mistake saying the path to the file is too long (I am using postgressql). Important detail - I have moved the files one level and renamed the folder containing them. From that point I have tried everything. I have edited settings file few times and made different imports in the file of the model itself. The result is the same compilers mistake:

ImportError: cannot import name 'DEFAULT_SETTINGS_MODULE' from 'manage' (/home/bodhi/PycharmProjects/Internet_shop/manage.py)

I have found similar problems with the models migrations for django here, at stackoverflow but no advice from them worked for me.
The code for my model:

import sys, os
sys.path.insert(0, "/home/bodhi/PycharmProjects/Internet_shop/manage.py")

from manage import DEFAULT_SETTINGS_MODULE
os.environ.setdefault(DJANGO_SETTINGS_MODULE="/home/bodhi/PycharmProjects/Internet_shop/internet/settings.py")

import django
django.setup()

from django.db import models


class Categories (models.Model):
 name = models.CharField(max_length=200, unique=True)
 add_category = models.CharField(max_length=200, unique=True)
 remove_category = models.CharField(max_length=200, unique=True)


class Item (models.Model):
 name = models.CharField(max_length=200, unique=True)
 price = models.DecimalField(max_length=9, max_decimal_places=2)
 quantity = models.DecimalField(max_length=9, max_decimal_places=2)
 category_name = models.ForeignKey(Categories, on_delete=models.CASCADE)
 add_item = models.CharField(max_length=200, unique=True)
 remove_item = models.CharField(max_length=200, unique=True)


class OrderBasket (models.Model):
 add_item = models.ForeignKey(Item, on_delete=models.CASCADE)
 remove_item = models.ForeignKey(Item, on_delete=models.CASCADE)
 delete_all = models.CharField(on_delete=models.CASCADE)
 count_order = models.ForeignKey(Item.price, on_delete=models.CASCADE)


class User (models.Model):
 user_login = models.EmailField(max_length=200, unique=True)
 money = models.DecimalField(max_length=9)
 order_history = models.ForeignKey(OrderBasket, on_delete=models.CASCADE)