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

Question

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] 

Answer 1

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)     ...