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import uuid
from django.db import models
from django.core import validators
from django.contrib.auth.models import User
from django.db.models.base import Model
from django.db.models.deletion import SET, SET_NULL
from django.db.models.fields.related import ManyToManyField, OneToOneField

class Author(models.Model):

    class Meta:
        verbose_name = 'Автор'
        verbose_name_plural = 'Авторы'
        ordering = ['id']
        unique_together = ('name', 'age')

    TYPES = (
        ('a', 'forein'),
        ('b', 'domestic'),
        ('c', 'other')
    id = models.UUIDField(primary_key=True, db_index=True, default=uuid.uuid4)
    name = models.CharField(verbose_name='Имя автора', 
     validators=[validators.RegexValidator(regex='^.*em$', message='Wrong')])
    age = models.PositiveIntegerField(verbose_name='Возраст автора')
    email = models.EmailField(verbose_name='Почта автора')
    lit_type = models.CharField(max_length=1, verbose_name='Тип литиратуры', choices=TYPES, default='a')
    def __str__(self):

class Book(models.Model):

    class Meta:
        verbose_name = 'Книга'
        verbose_name_plural = 'Книги'
        get_latest_by = 'published'

    title = models.CharField(max_length=200)
    description = models.TextField()
    page_num = models.PositiveIntegerField()
    published = models.DateTimeField(auto_now_add=True)
    author = models.ForeignKey(Author, on_delete=models.CASCADE)

    def __str__(self):
        return self.title

class ExtUser(models.Model):
    desc = models.CharField(max_length=200)
    is_loggen = models.BooleanField(default=True)
    user = OneToOneField(User, on_delete=SET_NULL, null=True)

    def __str__(self):
        return self.desc

class Product(models.Model):
    name = models.CharField(max_length=200)

    def __str__(self):

class Store(models.Model):
    name = models.CharField(max_length=200) 
    products = ManyToManyField(Product, related_name="Магазин")

    def __str__(self):

What I have tried:

When I try to access the key, I get this error, how can I fix it?

<pre>>>> b_1 = Book.objects.get(pk=1)
Traceback (most recent call last):
  File "<console>", line 1, in <module>
  File "C:\Users\user\Desktop\dz\new_pr\venv\lib\site-packages\django\db\models\", line 85, in manager_method
    return getattr(self.get_queryset(), name)(*args, **kwargs)
  File "C:\Users\user\Desktop\dz\new_pr\venv\lib\site-packages\django\db\models\", line 650, in get
    raise self.model.DoesNotExist(
web_lib.models.Book.DoesNotExist: Book matching query does not exist.
>>> b1 = Book.objects.get(pk=1)  
Traceback (most recent call last):
web_lib.models.Book.DoesNotExist: Book matching query does not exist.
Updated 23-Nov-22 5:17am

1 solution

The message is telling you that the database could not find a Book record with a pk of 1. Check the contents of the database tables to see exactly what it does have.
Share this answer
Eva Smirnova 23-Nov-22 11:38am    
I have books in the database, I don't understand where else to look?
Richard MacCutchan 23-Nov-22 11:49am    
Try this in the shell:
for book in Books.objects.all():

That should display the ids of all the Book records in the database. I don't know what the names of the other fields are but you could print the title or name alongside the id number.
Eva Smirnova 23-Nov-22 12:15pm    
I found the cause of the error, it turns out I had two identical elements in the database, that's why it didn't work, I wanted to add two books to the author, now everything worked.

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