CharField - Django Models - GeeksforGeeks

12 Apr, 2022
CharField is a string field, for small- to large-sized strings. It is like a string field in C/C+++. CharField is generally used for storing small strings like first name, last name, etc. To store larger text TextField is used. The default form widget for this field is TextInput. 
CharField has one extra required argument: 
CharField.max_length
The maximum length (in characters) of the field. The max_length is enforced at the database level and in Django’s validation using MaxLengthValidator. 
Syntax:
field_name = models.CharField(max_length=200, **options) 
Illustration of CharField 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. 
Python3
from django.db import modelsfrom django.db.models import Model# Create your models here. class GeeksModel(Model):    geeks_field = models.CharField(max_length = 200)
Add the geeks app to INSTALLED_APPS 
Python3
# 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 
Python3
# 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.CharField(                  max_length = 200,                )),            ],        ),    ]
Now run, 
Python manage.py migrate
Thus, an geeks_field CharField is created when you run migrations on the project. It is a field to store small- to large-sized strings.
CharField is used for storing small sized strings in the database. One can store First Name, Last Name, Address Details, etc. CharField should be given an argument max_length for specifying the maximum length of string it is required to store. In production server, after the Django application is deployed, space is very limited. So it is always optimal to use max_length according to the requirement of the field. Let us create an instance of the CharField we created and check if it is working.
Python3
# importing the model# from geeks appfrom geeks.models import GeeksModel # creating a instance of# GeeksModelgeek_object = GeeksModel.objects.create(geeks_field ="GFG is Best")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 CharField will enable it to store empty values for that table in a relational database. Here are the field options and attributes that an CharField can use. 
NaveenArora
annianni
tankisingh7
Django-models
Python Django
Python
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