django.db.models CharField Example Code

CharField is a commonly-defined field used as an attribute to reference a text-based database column when defining Model classes with the Django ORM.

The Django project has wonderful documentation for CharField and all of the other column fields.

Note that CharField is defined within the django.db.models.fields module but is typically referenced from django.db.models rather than including the fields module reference.

Example 1 from django-smithy

django-smithy is a code library for Django that allows users to send HTTP requests from the Django admin user interface. The code for the project is open source under the MIT license.

django-smithy / smithy /

# -*- coding: utf-8 -*-

from django.db import models
from django.db.models.signals import post_save
from django.dispatch import receiver
from requests import Request as HTTPRequest, Session
from requests.cookies import create_cookie, RequestsCookieJar
from urllib.parse import parse_qs, urlparse, urlencode
from requests_toolbelt.utils import dump

from model_utils.models import TimeStampedModel

from smithy.helpers import render_with_context, parse_dump_result

class NameValueModel(TimeStampedModel):
    name = models.CharField(max_length = 200)
    value = models.TextField(blank = True)

    def __str__(self):

    class Meta:
        abstract = True

class Request(TimeStampedModel):
    A base model shared by RequestBlueprint and
    RequestRecord. Used solely to reduce
    METHODS = (
        ('GET', 'GET'),
        ('POST', 'POST'),
        ('PUT', 'PUT'),
        ('DELETE', 'DELETE'),
        ('OPTIONS', 'OPTIONS'),
        ('HEAD', 'HEAD'),
    BODY_TYPES = (
        ('', 'Other'),
        ('application/x-www-form-urlencoded', 'x-www-form-urlencoded'),
        ('application/json', 'JSON'),
        ('text/plain', 'Text'),
        ('application/javascript', 'JavaScript'),
        ('application/xml', 'XML (application/xml)'),
        ('text/xml', 'XML (text/xml)'),
        ('text/html', 'HTML'),
    method = models.CharField(
        max_length = 7, choices = METHODS,
        blank = False, null = False)
    name = models.CharField(max_length = 500, blank = False)
    url = models.CharField(max_length = 2083)
    body = models.TextField(blank = True)
    content_type = models.CharField(
        default = BODY_TYPES[0][0],
        blank = True, null = True,
        max_length = 100, choices = BODY_TYPES)

    def __str__(self):
        return "{} {}".format(

## source file continues from here without further CharField examples

Example 2 from django-push-notifications

django-push-notifications is a Django app for storing and interacting with push notification services such as Google's Firebase Cloud Messaging and Apple Notifications. The django-push-notification project's source code is available open source under the MIT license.

django-push-notifications / push_notifications /

from __future__ import unicode_literals

from django.db import models
from django.utils.encoding import python_2_unicode_compatible
from django.utils.translation import ugettext_lazy as _

from .fields import HexIntegerField

    ("FCM", "Firebase Cloud Message"),
    ("GCM", "Google Cloud Message"),

    ("CHROME", "Chrome"),
    ("FIREFOX", "Firefox"),
    ("OPERA", "Opera"),

class Device(models.Model):
    name = models.CharField(max_length=255, verbose_name=_("Name"), 
                            blank=True, null=True)
    active = models.BooleanField(
        verbose_name=_("Is active"), default=True,
        help_text=_("Inactive devices will not be sent notifications")
    user = models.ForeignKey(
        SETTINGS["USER_MODEL"], blank=True, null=True, 
    date_created = models.DateTimeField(
        verbose_name=_("Creation date"), auto_now_add=True, null=True
    application_id = models.CharField(
        max_length=64, verbose_name=_("Application ID"),
            "Opaque application identity, should be filled in for"
            " multiple key/certificate access"
        blank=True, null=True

    class Meta:
        abstract = True

    def __str__(self):
        return (
            str(self.device_id or "") or
            "%s for %s" % (self.__class__.__name__, 
                           self.user or "unknown user")

## source file continues from here with a few other simple CharField examples
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