Web Dakaar Digital Consultancy Interview Questions and Answers

To fetch API data in Django from server using params dynamically.

• Use Django's HttpRequest object to access query parameters

• Extract the query parameter value using request.GET.get('querydata')

• Use the extracted value to dynamically fetch data from the server

To revert changes made in Django migrations, use the command 'python manage.py migrate <app_name> <migration_name>'.

• Use the command 'python manage.py showmigrations' to list all migrations and their names.

• Identify the migration name you want to revert (e.g., 'app_name', '0002_migration_name').

• Run the command 'python manage.py migrate <app_name> <migration_name>' to revert the specific migration.

Decorators in Django are used to modify the behavior of functions or methods. @login_required ensures user authentication, while @permission_required checks for specific permissions.

• Decorators are functions that wrap another function to modify its behavior.

• @login_required decorator ensures that the user is authenticated before accessing a view.

• @permission_required decorator checks if the user has specific permissions before allowing access.

• Example: @login_required def my_view...read more

SQL Procedures are stored SQL code that can be executed on demand. Triggers are special types of stored procedures that are automatically executed when certain events occur.

• SQL Procedures are reusable blocks of SQL code that can be called by other programs or scripts.

• Triggers are special types of stored procedures that are automatically executed when specific events occur in the database.

• Triggers are commonly used for enforcing business rules, auditing changes, and maintainin...read more

Message queues and caching systems are used to improve performance and scalability in web applications.

• Message queues help in decoupling components by allowing asynchronous communication between them.

• Caching systems store frequently accessed data in memory to reduce database load and improve response times.

• Popular message queue systems include RabbitMQ, Kafka, and Redis.

• Common caching systems include Memcached and Redis.

• Django provides built-in support for caching using the c...read more

REST API is a set of rules and conventions for building and interacting with web services.

• REST stands for Representational State Transfer

• Methods available in REST API are GET, POST, PUT, DELETE

• GET - Used to retrieve data from a server

• POST - Used to send data to a server to create a new resource

• PUT - Used to update an existing resource on the server

• DELETE - Used to remove a resource from the server

• Example: GET request to fetch a list of users from a database

Custom middleware in Django allows for processing requests and responses before reaching views.

• Custom middleware is a Python class that defines methods to process requests and responses in Django.

• To create custom middleware, define a class with methods like process_request, process_response, etc.

• Register the custom middleware in the Django settings.py file under the MIDDLEWARE key.

• Example code: class CustomMiddleware: def __init__(self, get_response): self.get_response = get_...read more

Django supports multiple databases through its database router feature.

• Django allows defining multiple database connections in settings.py

• Use database routers to route specific models to different databases

• Example: routing user data to a separate database for better performance