Python, dJango & ReactJS

Section 1: Python with Django

1. Implement logging and exception handling mechanism in python with Django, use well known concepts and design patterns.

Implement database interaction using Django ORM, consider 2 entities - Author (name and age) and Book (name, pulication_date and Author), show all CRUD operations and some complex queries.

You are tasked with creating a simple RESTful API using Django and Django REST Framework (DRF) to manage a blog.
The API should allow clients to perform CRUD (Create, Read, Update, Delete) operations on blog posts.
Each blog post has a title, content, and publication date. How would you implement this?

State Management, Create a React component for a dynamic form where the number of input fields can be increased by the user.

Manage the state of all input fields using a single-state object.

React Hooks, Create a component that uses react hooks to update the document title every time the component updates, based on a piece of state.

Create a component that fetches data from an API using HTTP client and displays it. Include error handling and loading state.

Write a function in (in any code) that finds the factorial of a given integer using recursion.

Given a sorted array from 1 to N, there is a bug that somewhere in the array there is a jump of 1 number, Write an algorithm in Python/React to find the index of the jump.

Example:

index 0 1 2 3 4 5 6 7 8 9

value 0 1 2 3 5 6 7 8 9 10

Write a SQL query to retrieve all unique customers who have made purchases in the last month from a "Customers" table and an "Orders" table.

Assuming you have a "Customers" table with a unique "CustomerID" and an "Orders" table with a "CustomerID" and a "OrderDate" column, here's a SQL query.

Imagine you are building a feature for a real-time collaborative document editor (like Google Docs) where multiple users can edit the same document simultaneously.

Describe how you would approach implementing this feature, considering aspects like conflict resolution, performance, and user experience.

Also, discuss the technologies or algorithms you might use.

Create a basic prototype of a real-time text editor.

Focus on setting up a WebSocket server and enabling live text updates across multiple clients.