Auto-create primary key used when not defining a primary key type warning in Django

I just updated my python from 3.9.1 to 3.9.4. When I tried to run the server. The console gave me a warning for this:

WARNINGS:
learning_logs.Entry: (models.W042) Auto-created primary key used when not defining a primary key type, by default 'django.db.models.AutoField'.
HINT: Configure the DEFAULT_AUTO_FIELD setting or the LearningLogsConfig.default_auto_field attribute to point to a subclass of AutoField, e.g. 'django.db.models.BigAutoField'.
learning_logs.Topic: (models.W042) Auto-created primary key used when not defining a primary key type, by default 'django.db.models.AutoField'.
HINT: Configure the DEFAULT_AUTO_FIELD setting or the LearningLogsConfig.default_auto_field attribute to point to a subclass of AutoField, e.g. 'django.db.models.BigAutoField'.
No changes detected in app 'learning_logs'

May I please know how do I fix this.
I read the documentation about this, but I don’t understand how this part this page relates to this.

Models.py

from django.db import models
from django.contrib.auth.models import User
# Create your models here.

class Topic(models.Model):
    text = models.CharField(max_length = 200)
    date_added = models.DateTimeField(auto_now_add = True)
    image = models.ImageField(upload_to = 'backgroud_images', null = True, blank = True)
    owner = models.ForeignKey(User,on_delete = models.CASCADE)
    def __str__(self):
        return self.text



class Entry(models.Model):
    topic = models.ForeignKey(Topic,on_delete = models.CASCADE)
    text = models.TextField()
    date_added = models.DateTimeField(auto_now_add = True)

    class Meta:
        verbose_name_plural = "Entries"

    def __str__(self):
        return self.text[:50]

Solution

Your models do not have primary keys. But they are being created automatically by django.

You need to choose type of auto-created primary keys
https://docs.djangoproject.com/en/3.2/releases/3.2/#customizing-type-of-auto-created-primary-keys (new in Django 3.2)

Either add this into settings.py
DEFAULT_AUTO_FIELD='django.db.models.AutoField'

or

class Topic(models.Model):
    id = models.AutoField(primary_key=True)
    ...

Source: StackOverflow.com