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Django Interview Questions and Answers

Test your skills through the online practice test: Django Quiz Online Practice Test

Ques 41. How is the “migrate” command used in Django?

In Django, migrations are used for propagating the changes made to models. You can use the migrate command to apply and remove the migration changes made to models.

This command helps synchronize the current set of models and migrations with the database state. You can also use this command with or without passing the parameters. If you do not specify any parameters, all apps will have all their migrations running.

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Ques 42. What is the response cycle in Django?

Whenever a user requests a web page, Django will create an HttpRequest object containing the important metadata about that request. After that, Django will load a particular view, passing the HttpRequest as its first argument to the view function. Each view then returns an HttpResponse object.


The following are the steps that take place when a request is received by Django:

  • Firstly, the settings.py file, which contains various middleware classes, is loaded
  • All the middleware classes get executed in the same order in which they are mentioned
  • Now, the request will be moved to the URL Router. The URL Router gets the URL path from the request and later tries to map with the given URL paths within the urls.py.
  • After mapping, it calls the equivalent view function, from where the corresponding response is generated.
  • The response now passes through the response middleware and is sent back to the client/browser

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Ques 43. What is the difference between select_related and prefetch_related?

select_related()

prefetch_related()

The select_related() is lookup for a queryset, it adds the additional forward foreignkey data to the return queryset.

The prefetch_related() is another lookup for a queryset, it add the additional forward ForeignKey, OneToOne and backward OneToOne data to the return queryset.

It reduces the background SQL query using JOIN statements.

It uses the SQL joins and SELECT command to reduce the complex query set.

It works when we are selecting single objects.

It is used to select a set of multiple objects.

Example

queryset = Blog.objects.select_related('Author').all()

Example

queryset = Blog.objects.prefetch_related('Categories').all()

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Ques 44. What are the different tasks that can be performed using Django-admin?

Django-admin is the command-line utility of Django used for carrying out administrative tasks. The below table highlights various tasks performed using Django-admin:


Task

Command

Displaying the usage information and the list of commands provided by each application.

django-admin help

Displaying the list of available commands

django-admin help –command

Getting the description of a specific command and the list of its available options

django-admin help <command>

Checking the version of Django

django-admin version

Creating new migrations depending on the changes made in the models

django-admin makemigrations

Synchronizing a database state with its current set of models and migrations

django-admin migrate

Starting the development server

django-admin runserver

Sending a test email to confirm if Django is working

django-admin sendtestemail

Starting the Python interactive interpreter

django-admin shell

Displaying all migrations in your project

django-admin showmigrations

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Ques 45. How can you connect the Django project with the database?

By default the Djagno connected to the SQLite database, with the following setting:

DATABASES = {    'default': {        'ENGINE': 'django.db.backends.sqlite3',        'NAME': BASE_DIR / 'db.sqlite3',    }}

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