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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