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 / models.py

# -*- 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):
        return self.name

    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):
        if self.name:
            return self.name
        return "{} {}".format(
            self.method,
            self.url,
        )


## 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 / models.py

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
from .settings import PUSH_NOTIFICATIONS_SETTINGS as SETTINGS


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

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


@python_2_unicode_compatible
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, 
        on_delete=models.CASCADE
    )
    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"),
        help_text=_(
            "Opaque application identity, should be filled in for"
            " multiple key/certificate access"
        ),
        blank=True, null=True
    )

    class Meta:
        abstract = True

    def __str__(self):
        return (
            self.name or
            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
1. Introduction 2. Development Environments 3. Data 4. Web Development 5. Deployment 6. DevOps Changelog What Full Stack Means About the Author Future Directions Page Statuses Django Code Examples django.urls.path django.conf.urls.url django.contrib.admin django.db.models Model django.dispatch Signal django.db.models.signal django.core.mail.send_mail django.core.mail.messages EmailMessage django.conf settings django.forms django.contrib.admin.sites register django.core.management.base BaseCommand django.utils.timezone django.contrib.auth get_user_model django.contrib.auth.decorators login_required django.core.exceptions ImproperlyConfigured django.utils.html format_html django.contrib.auth.hashers make_password django.http Http404 django.http HttpResponse django.http HttpResponseForbidden django.http HttpResponseBadRequest django.contrib.admin.filters SimpleListFilter django.urls.exceptions NoReverseMatch django.http HttpResponsePermanentRedirect django.http HttpResponseNotModified django.http HttpResponseRedirect django.apps.config AppConfig django.db OperationalError flask_sqlalchemy.SQLAlchemy Model django.db.models CharField django.db.models TextField django.db.models BooleanField flask request flask redirect django.db.models DateTimeField django.db.models IntegerField django.db.models AutoField django.db.models DateField django.db.models FileField django.template.response TemplateResponse django.template.response SimpleTemplateResponse SQLAlchemy Model Examples django.urls reverse_lazy Flask Core and Extensions Code Examples ...or view the full table of contents.

Full Stack Python

Full Stack Python is an open book that explains concepts in plain language and provides helpful resources for those topics.
Updates via Twitter & Facebook.

Matt Makai 2012-2019