DeleteView - Class Based Views Django

A DeleteView is a built-in class-based view used to remove a record from the database. It automatically fetches the record, shows a confirmation page, deletes the record, and redirects.

• Specify the model that contains the record to be deleted.
• Provide a template to show the delete confirmation page.
• Set a success URL to redirect after the record is deleted.

Example: Consider a project named 'geeksforgeeks' having an app named 'geeks'.  After you have a project and an app, let's create a model of which we will be creating instances through our view.

In geeks/models.py:

from django.db import models
 
# declare a new model with a name "GeeksModel"
class GeeksModel(models.Model):

    # fields of the model
    title = models.CharField(max_length = 200)
    description = models.TextField()

    # renames the instances of the model
    # with their title name
    def __str__(self):
        return self.title

After creating this model, we need to run two commands in order to create Database for the same:

Python manage.py makemigrations
Python manage.py migrate

Let's create some instances of this model using shell, enter the following command to launch Python shell:

Python manage.py shell

Enter following commands to create entries in database:

>>> from geeks.models import GeeksModel
>>> GeeksModel.objects.create( title="title1", description="description1")
>>> GeeksModel.objects.create(title="title2", description="description2")
>>> GeeksModel.objects.create(title="title3", description="description3")

Now we have everything ready for back end. Verify that instances have been created from http://localhost:8000/admin/geeks/geeksmodel/ 

Class Based Views automatically setup everything. One just needs to specify which model to create DeleteView for, then Class based DeleteView will automatically try to find a template in app_name/modelname_confirm_delete.html. In our case it is geeks/templates/geeks/geeksmodel_confirm_delete.html.

Create class based view in geeks/views.py:

from django.views.generic.edit import DeleteView

# Relative import of GeeksModel
from .models import GeeksModel

class GeeksDeleteView(DeleteView):
    # specify the model you want to use
    model = GeeksModel
    
    # can specify success url
    # url to redirect after successfully
    # deleting object
    success_url ="/"
    
    template_name = "geeks/geeksmodel_confirm_delete.html"

Now create a url path to map the view. In geeks/urls.py: 

from django.urls import path

# importing views from views..py
from .views import GeeksDeleteView
urlpatterns = [
    # <pk> is identification for id field,
    # slug can also be used
    path('<pk>/delete/', GeeksDeleteView.as_view()),
]

Create a template in templates/geeks/geeksmodel_confirm_delete.html:

<form method="post">{% csrf_token %}
    
<p>Are you sure you want to delete "{{ object }}"?</p>

    <input type="submit" value="Confirm">
</form>

Check what is there on: http://localhost:8000/1/delete 
 

Tap confirm and object will redirect to "success_url" defined in the view. Let's check if title1 is deleted from database. 

Suggested Quiz

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3 Questions

What is the main purpose of DeleteView in Django?

• A

  To display a list of objects

• B

  To create a new object

• C

  To remove an existing record from the database

• D

  To update an existing record

Explanation:

DeleteView handles deletion of a model instance from the database after confirmation.

What does DeleteView do when it receives a GET request by default?

• A

  Immediately deletes the object

• B

  Redirects to home page

• C

  Displays a confirmation page before deletion

• D

  Shows an error

Explanation:

On GET request DeleteView shows a confirmation template asking user to confirm before deleting.

After a successful deletion by DeleteView what must be provided so that user is redirected properly?

• A

  A success message only

• B

  A new database record

• C

  A list of all objects

• D

  A success_url specifying where to redirect

Explanation:

DeleteView requires a success_url attribute so that after deletion the response redirects to a given URL.

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