Django is an open-source high-level Python web framework that encourages rapid development and clean, pragmatic design.
ModelFormSets?In Django, ModelFormsets is an advanced way to handle multiple forms created with a model. ModelFormSets uses the model to create model instances.
Just as standard Django forms can be grouped together as a set in a Django FormSet, Django model forms can be grouped into a ModelFormSet.
ModelFormSet also has a lot of similarities with the standard FormSet.
ModelFormSet can be used to initialize multiple forms, involving POST requests on some or all of them, on a single page.
The example below demonstrates how ModelFormSet can be used.
pip install pipenv
pipenv shell
pipenv install django
Then:
django-admin startproject DjangoFormset ./
python manage.py startapp codebase
python manage.py migrate
python manage.py runserver
Once the settings have been initialized, the following changes should be made.
Go to settings.py and enter the following:
INSTALLED_APPS = ['django.contrib.admin','django.contrib.auth','django.contrib.contenttypes','django.contrib.sessions','django.contrib.messages','django.contrib.staticfiles','codebase']
In the codebase app folder, the code below is added to the model.py file.
from django.db import models# adding the modelclass ModelFormSetModel(models.Model):name = models.CharField(max_length = 200)email = models.CharField(max_length=200)department = models.TextField()# the name of the model that will be showing in the admin panelclass Meta:verbose_name_plural = 'data'#so it will use emaill to reference a particular datadef __str__(self):return self.email
This is the main part that focuses on ModelFormSet and explains how it is implemented.
In order to use ModelFormSet, Django makes use of modelformset_factory.
For example:
from .models import ModelFormsetModel
from django.forms import modelformset_factory
DjangoFormset = modelformset_factory(ModelFormsetModel, fields = '__all__')
This is the main code for views.py:
from django.shortcuts import render#importing the modelfrom .models import ModelFormSetModel# importing django modelformset_factory used for modelformsetfrom django.forms import modelformset_factorydef home(request):#displaying the neccessary fields needed to be displayed on the frontendDjangoFormSet = modelformset_factory(ModelFormSetModel, fields =['name', 'email','department'])# refrencing the DjangoFormset as a methodformset = DjangoFormSet()# Add the formset to context dictionarycontext = {'formset':formset}return render(request, "app/home.html", context)
In the codebase app, create a folder and name it templates. Inside the templates folder, create another folder and name it app, and inside the app folder, create a home.html file.
<!DOCTYPE html><html lang="en"><head><meta charset="UTF-8"><meta http-equiv="X-UA-Compatible" content="IE=edge"><meta name="viewport" content="width=device-width, initial-scale=1.0"><title>Django ModelFormSets</title></head><body><form method="POST" enctype="multipart/form-data"><!-- csrf token -->{% csrf_token %}<!-- displaying the form from the backend -->{{ formset.as_p }}<input type="submit" value="Submit"></form></body></html>
In the urls.py file in the DjangoFormset folder, add the following:
from django.contrib import adminfrom django.urls import path, includeurlpatterns = [path('admin/', admin.site.urls),# including the codebase urls.py filepath('', include('codebase.urls'))]
Then, in the codebase folder, create a file and name it urls.py.
from django.urls import pathfrom .views import homeurlpatterns = [path('', home, name='home'),]
Run the following commands:
python manage.py makemigrations
python manage.py migrate
After this, run:
python manage.py runserver
Then, go to:
http://127.0.0.1:8000