how to use validate_ipv4_address in django
Last Updated :
02 Oct, 2023
A validator is a callable that takes a value and raises a ValidationError if it doesn’t meet the criteria. Validators can be useful for re-using validation logic between different types of fields. In this article, we will learn how to use the 'validate_ipv4_address' validator in Django.
Required Modules
Use of validate_ipv4_address in Django
To start the project use this command
django-admin startproject queryexpressionsproject
cd app
To start the app use this command
python manage.py startapp app
Now add this app to the 'settings.py'
Starting the Project
model.py: This code snippet demonstrates how to define a Django model with custom validators for specific fields. It enforces data integrity by ensuring that the ip_address field, the ip_address field contains a valid IPv4 address.'ip_address' as a character field with a maximum length of 15 characters. It uses the built-in 'validate_ipv4_address' validator to validate that the input data is a valid IPv4 address.
Python3
from django.db import models
from django.core.exceptions import ValidationError
from django.core.validators import validate_ipv4_address
class Product(models.Model):
name = models.CharField(max_length=100)
price = models.DecimalField(max_digits=10, decimal_places=2)
quantity = models.PositiveIntegerField()
ip_address = models.CharField(max_length=15,
validators=[validate_ipv4_address])
def __str__(self):
return self.name
form.py: This custom validation method if any part of the input is not a valid integer, it raises a validation error. Otherwise, it returns the cleaned data as a string with valid integers.
Python3
from django import forms
from .models import Product
class ProductForm(forms.ModelForm):
class Meta:
model = Product
fields = ['name', 'price', 'quantity', 'ip_address']
view.py: Overall, this code represents a Django application with views that display expensive products and allow users to create new products through a form. The 'Product' model is used to interact with the database, and the views handle the logic for rendering templates and processing form submissions.
Python3
# app/views.py
from django.http import HttpResponse
from django.db import models
from .models import Product
from django.shortcuts import render, redirect
from .forms import ProductForm
def home(request):
return HttpResponse('Hello, World!')
def expensive_products(request):
# Calculate the total value and filter for expensive products
expensive_products = Product.objects.annotate(
total_value=models.ExpressionWrapper(models.F('price') * models.F('quantity'),
output_field=models.DecimalField())
).filter(total_value__gt=1000)
return render(request, 'myapp/index.html',
{'expensive_products': expensive_products})
def create_product(request):
if request.method == 'POST':
form = ProductForm(request.POST)
if form.is_valid():
form.save()
# Redirect to the expensive products
# page or another appropriate page
return redirect('expensive_products')
else:
form = ProductForm()
return render(request, 'myapp/index2.html', {'form': form})
Setting up GUI
index.html: The index.html template to display the categories for each product.
HTML
<!DOCTYPE html>
<html>
<head>
<title>Expensive Products</title>
</head>
<body>
<h1>Expensive Products</h1>
<ul>
{% for product in expensive_products %}
<li>
<strong>{{ product.name }}</strong><br>
Price: ${{ product.price }}<br>
Quantity: {{ product.quantity }}<br>
Total Value: ${{ product.total_value }}<br>
Valid IP4: ${{ product.ip_address }}
</li>
{% endfor %}
</ul>
</body>
</html>
index2.html: This template renders the product creation form.
HTML
<!DOCTYPE html>
<html>
<head>
<title>Create Product</title>
</head>
<body>
<h1>Create Product</h1>
<form method="post">
{% csrf_token %}
{{ form.as_p }}
<button type="submit">Create</button>
</form>
{% if form.errors %}
<div class="alert alert-danger">
<strong>Error:</strong>
<ul>
{% for error in form.errors %}
<li>{{ error }}</li>
{% endfor %}
</ul>
</div>
{% endif %}
</body>
</html>
urls.py: It include a new URL pattern for the product creation view.
Python3
# pdfapp/urls.py
from django.urls import path
from . import views
urlpatterns = [
path('hello/', views.home, name='home'),
path('expensive-products/', views.expensive_products, name='expensive_products'),
path('create-product/', views.create_product, name='create_product'),
]
urls.py: Include the 'products' app's URLs in the project's main urls.py file.
Python3
# pdfgenerator/urls.py
from django.contrib import admin
from django.urls import path, include
urlpatterns = [
path('admin/', admin.site.urls),
path('', include('mini.urls')),
]
Deployement of the Project
Run these commands to apply the migrations:
python3 manage.py makemigrations
python3 manage.py migrate
Run the server with the help of following command:
python3 manage.py runserver
Output
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