Change language

primary_key — Django inline field validation

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.

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,

Shop

Gifts for programmers

Learn programming in R: courses

$FREE
Gifts for programmers

Best Python online courses for 2022

$FREE
Gifts for programmers

Best laptop for Fortnite

$399+
Gifts for programmers

Best laptop for Excel

$
Gifts for programmers

Best laptop for Solidworks

$399+
Gifts for programmers

Best laptop for Roblox

$399+
Gifts for programmers

Best computer for crypto mining

$499+
Gifts for programmers

Best laptop for Sims 4

$

Latest questions

PythonStackOverflow

Common xlabel/ylabel for matplotlib subplots

1947 answers

PythonStackOverflow

Check if one list is a subset of another in Python

1173 answers

PythonStackOverflow

How to specify multiple return types using type-hints

1002 answers

PythonStackOverflow

Printing words vertically in Python

909 answers

PythonStackOverflow

Python Extract words from a given string

798 answers

PythonStackOverflow

Why do I get "Pickle - EOFError: Ran out of input" reading an empty file?

606 answers

PythonStackOverflow

Python os.path.join () method

384 answers

PythonStackOverflow

Flake8: Ignore specific warning for entire file

360 answers


Wiki

Python | How to copy data from one Excel sheet to another

Common xlabel/ylabel for matplotlib subplots

Check if one list is a subset of another in Python

How to specify multiple return types using type-hints

Printing words vertically in Python

Python Extract words from a given string

Cyclic redundancy check in Python

Finding mean, median, mode in Python without libraries

Python add suffix / add prefix to strings in a list

Why do I get "Pickle - EOFError: Ran out of input" reading an empty file?

Python - Move item to the end of the list

Python - Print list vertically