URLField — Django Models

Michael Zippo

Syntax

 field_name = models.URLField (max_length = 200,  ** options )

URLField has one additional optional argument:

 URLField.max_length

The maximum length (in characters) of the field. Maximum max_length applies at the database level and when validated by Django using MaxLengthValidator . If not specified, the default is 200.

Django URLField Model Explanation

Example URLField illustration. 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.

How to Create a Basic Project using MVT in Django?

How to Create an App in Django?

Enter the following code into the models.py file of the geeks application.

from django.db import models

from django.db.models import Model

# Create your models here.

class GeeksModel (Model):

geeks_field = models.URLField (max_length = 200 )

Add the geek app to INSTALLED_APPS

       # App 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 from the terminal,

  Python manage.py makemigrations 
  A new folder named migrations will be created in the  geeks  directory with a file named  0001_initial. py  
  
 
       # Generated by Django 2.2.5 at 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’  , 
     mode ls.AutoField (
   auto_created   =   True  , 
   primary_key   =   True  ,  
   serialize   =   False  , 
   verbose_name   =  ’ ID’  
    )), 
   (  ’geeks_field’  , 
     models.URLFie ld (
   max_length   =   200  , 
  )), 
  ],  
  ), 
    ]

Now run ,

 Python manage.py migrate

Thus, geeks_field geeks_field is generated when migrations are run in the project. This is a field for storing URLs validated by URLValidator .

How to use a URLField?

URLField is used to store URLs in the database. You can store any URLs, both internal and external. URLField must be given the max_length argument to specify the maximum length of the string that you want to store. On a production server, after deploying a Django app, space is very limited. Therefore, it is always optimal to use max_length as required by the field. Let’s instantiate the URLField we’ve created and see if it works.

# model import
# from a geek app

from geeks.models import GeeksModel

# instantiate
# GeeksModel

geek_object = GeeksModel.objects.create (geeks_field = " https://python.engineering / charfield-django-models / " )

ge ek_object.save ()

Now let’s check this on the admin server ... We have created a GeeksModel instance.

Field options

Field options — they are arguments given to each field to apply some constraint or to convey a particular characteristic to a particular field. For example, adding the null = True argument to the URLField will allow it to store null values for that table in a relational database.
Here are the field options and attributes that the URLField can use.

Field Options	Description
Null	If True , Django will store empty values as NULL in the database. Default is False.
Blank	If True , the field is allowed to be blank ... Default is False.
Choices	An iterable (eg, a list or tuple) of 2-tuples to use as choices for this field.
Default	The default value for the field. This can be a value or a callable object. If callable it will be called every time a new object is created.
help_text	Extra “help” text to be displayed with the form widget. It’s useful for documentation even if your field isn’t used on a form.
primary_key	If True, this field is the primary key for the model .
Unique	If True, this field must be unique throughout the table.

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URLField — Django Models

Django URLField Model Explanation

How to use a URLField?

Field options

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