primary_key — Django inline field validation

Michael Zippo

Note : primary_key = True means null = False and unique = True . Only one primary key is allowed per object.

Syntax

 field_name = models.Field (primary_key = True)

Django built-in field validation `primary_key = True` Explanation

Illustration of primary_key = True using example. Consider a project named pythonengineering that has an application named geeks .

Refer to the following articles to check how to create a project and an app in Django.

How to Create a Basic Project using MVT in Django?

How to Create an App in Django?

Enter the following code into the models.py file of the geeks application. We’ll use IntegerField to experiment with the primary_key.

from django.db import models

from django.db.models import Model

# Create your models here.

class GeeksModel (Model):

geeks_field = models.IntegerField (primary_key = True )

After starting As for the makemigrations and migrations to Django and the rendering of the above model, let’s try creating an instance using None from the Django shell. To start the Django shell, enter the command,

 Python manage.py shell

Now let’s try to create a GeeksModel instance using None .

# import required model

from geeks. models import GeeksModel

# instantiate GeeksModel

s = GeeksModel.objects.create (geeks_field = 12 )

# save the current instance of the model
s.save ()

Let’s check in the admin interface if the model is instantiated.

Therefore, primary_key = True changes the field to the PRIMARY KEY for this table. To learn more about the Primary Key,