UUIDField – Django Models

12 Feb, 2020
UUIDField is a special field to store universally unique identifiers. It uses Python’s UUID class. UUID, Universal Unique Identifier, is a python library that helps in generating random objects of 128 bits as ids. It provides the uniqueness as it generates ids on the basis of time, Computer hardware (MAC etc.). Universally unique identifiers are a good alternative to AutoField for primary_key. The database will not generate the UUID for you, so it is recommended to use default.
For example,
import uuidfrom django.db import models  class MyUUIDModel(models.Model):    id = models.UUIDField(         primary_key = True,         default = uuid.uuid4,         editable = False)    # other fields
Syntax
field_name = models.UUIDField(**options)
Illustration of UUIDField using an Example. Consider a project named geeksforgeeks having an app 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 models.py file of geeks app.
from django.db import modelsfrom django.db.models import Model# Create your models here.  class GeeksModel(Model):    geeks_field = models.UUIDField()
Add the geeks app to INSTALLED_APPS
# Application definition  INSTALLED_APPS = [    'django.contrib.admin',    'django.contrib.auth',    'django.contrib.contenttypes',    'django.contrib.sessions',    'django.contrib.messages',    'django.contrib.staticfiles',    'geeks',]
Now when we run makemigrations command from the terminal,
Python manage.py makemigrations
A new folder named migrations would be created in geeks directory with a file named 0001_initial.py
# Generated by Django 2.2.5 on 2019-09-25 06:00  from django.db import migrations, models  class Migration(migrations.Migration):      initial = True      dependencies = [    ]      operations = [        migrations.CreateModel(            name ='GeeksModel',            fields =[                ('id',                   models.AutoField(auto_created = True,                  primary_key = True,                  serialize = False,                   verbose_name ='ID'                )),                ('geeks_field',                   models.UUIDField()                 )),            ],        ),    ]
Thus, an geeks_field UUIDField is created when you run makemigrations on the project.It is a field to store python’s UUID instance.
UUID, Universal Unique Identifier, is a python library which helps in generating random objects of 128 bits as ids. To know more about UUID visit Generating Random id’s using UUID in Python. Let’s try to save a uuid object into the UUIDField.
# importing the model# from geeks appfrom geeks.models import GeeksModel  # importing uuidimport uuid  # creating an instance of# uuid objecttest = uuid.uuid4()  # creating a instance of # GeeksModelgeek_object = GeeksModel.objects.create(geeks_field = test)geek_object.save()
Now let’s check it in admin server. We have created an instance of GeeksModel
Field Options are the arguments given to each field for applying some constraint or imparting a particular characteristic to a particular Field. For example, adding an argument null = True to UUIDField will enable it to store empty values for that table in relational database.Here are the option and attributes that an UUIDField can use.
NaveenArora
Django-models
Python Django
Python
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