A Developer's Diary: {name: 'Arun Prasher'}

Implementing Throttling in Django REST Framework to Manage High Traffic and Prevent Abuse Introduction In high-traffic applications, it’s essential to protect server resources and ensure fair usage among users. Throttling is a method used in Django REST Framework (DRF) to limit the rate of requests, helping prevent abuse and manage load. In this article, we’ll explore how to implement throttling in DRF, including ways to apply it to specific views and dynamically whitelist IPs. What is Throttling? Throttling controls the rate of requests an API endpoint can receive from a single client. It’s a valuable tool for: Preventing abuse by limiting request rates for each user or IP address. Managing server load by avoiding high request volumes that can overwhelm the application. In Django REST Framework, throttling is easy to configure with built-in classes like UserRateThrottl...

As web applications grow, handling a high volume of concurrent requests becomes essential. Traditional Django views, which are synchronous, can slow down the system by tying up resources for each request. Fortunately, starting with Django 3.1, asynchronous views were introduced. By leveraging async views, Django can serve more requests concurrently, improving scalability and responsiveness. Understanding Asynchronous Views in Django Asynchronous views allow Django to handle tasks that involve waiting, like database queries or API calls, without blocking threads. This approach allows the server to handle additional requests in the meantime. In Django, async views use the async and await keywords to enable non-blocking behavior. Example: Fetching Data from an External API Here’s an example of an asynchronous view in Django that fetches weather data from an external API. Instead of blocking while waiting for the API response, Django can handle oth...

In Python, lists, dictionaries, and tuples are all built-in data structures that store collections of items. While they share similarities, each has its distinct characteristics and use cases. This post provides a comprehensive comparison. Comparison Table Aspect List Dictionary Tuple Definition An ordered collection of elements. A collection of key-value pairs. An ordered and immutable collection of elements. Access Method Index-based access ( my_list[0] ). Key-based access ( my_dict['key'] ). Index-based access ( my_tuple[0] ). Mutability Mutable: Elements can be added, removed, or changed. Mutable (for values): Keys/values can be added, modified, or removed, but keys must be immutable. Immutable: Elements cannot be changed once assigned. Order Guarantee Maintains th...

Introduction Integrating Firebase App Check with Firestore enhances your app's security by ensuring that only legitimate app instances can access your backend resources. However, developers often encounter the "Missing or insufficient permissions" error when setting up App Check with Firestore. This error typically indicates issues with initialization order, configuration, or security rules. In this blog post, we'll explore the common causes of this error and provide a step-by-step guide to troubleshoot and resolve it, ensuring your app interacts securely and seamlessly with Firestore. Understanding Firebase App Check and Firestore Security Rules Firebase App Check helps protect your backend resources from abuse by verifying that incoming traffic comes from your app. It does this by attaching an App Check token to each request. Firestore Security Rules use these tokens to determine whether a request should be allowed. Specifically, the rule allow read, ...

Migrations in Django are essential for managing changes to your database schema over time. However, during development or when migrations become too cumbersome, you might need to reset them entirely. This guide will walk you through the process of resetting all migrations in a Django project, ensuring a clean slate for your database schema. Table of Contents Why Reset Migrations? Prerequisites Step-by-Step Reset Guide Backup Your Database Identify Affected Apps Delete Migration Files Reset Migrations to Zero Recreate Initial Migrations Apply Migrations Thoroughly Test Your Application Understanding Django Migration Commands Handling Manual Schema Changes Conclusion Why Reset Migrations? Over time, as a project evolves, the number of migration files can grow significantly. This can make it challenging to manage migrations, especially if: You've made substantial changes to your models. Mi...

In the ever-evolving world of Python development, managing project dependencies and Python versions can become a complex task. Tools like Pipenv and Pyenv have been created to simplify these processes, but understanding how they work individually and together is crucial for efficient project management. This comprehensive guide will delve into the functionalities of Pipenv and Pyenv, highlight their differences, and demonstrate how to effectively use them in your Python projects. Table of Contents Introduction to Pipenv Key Features of Pipenv Pipenv General Commands Pipfile vs requirements.txt Managing Dependencies in a Django Application Creating a Pipfile and Pipfile.lock Example Pipfile Explained Automatic Updating of Pipfile and Pipfile.lock Setting Up the Project with Pipenv Introduction to Pyenv Key...

In JavaScript, scope refers to the accessibility of variables and functions in various parts of your code. It defines where you can access a particular variable or function and how they are managed within different blocks, functions, or the global environment. Understanding scope is crucial for writing clean, efficient code and avoiding common issues like variable conflicts or unexpected behavior. JavaScript has several types of scope: Global Scope Local Scope Block Scope Function Scope Lexical Scope 1. Global Scope Variables or functions declared outside any function or block exist in the global scope. These can be accessed from anywhere in the code. However, globally scoped variables should be used with caution, as they can lead to naming conflicts and make debugging more difficult. If a variable is declared without var , let , or const , it becomes a global variable by default. let globalVar = "I am global"; // Declared in the global...

JavaScript’s scoping rules can be tricky, but they are essential for writing efficient and clean code. In this post, we’ll dive into lexical scope, explore variable declarations with var , let , and const , and compare their usage to help you understand when to use each. What is Lexical Scope? Lexical scope refers to how variable accessibility is determined by the structure of your code at the time it is written, not at runtime. Essentially, where you write a function determines which variables it can access, regardless of when the function is called. Key Points: Variables are accessible based on where they are written in the code, not when the function runs. Functions can access variables from their outer scopes. The scope is fixed and does not change during runtime. Example of Lexical Scope: function outerFunction() { const outerVar = 'I am outside!'; function innerFunction() { console.log(outerVar); // Can access outerVar due to lexical scoping } ...

Feature/Behavior var let const Scope Function-scoped Block-scoped Block-scoped Re-declaration Allowed Not allowed Not allowed Re-assignment Allowed Allowed Not allowed Hoisting Yes, initialized to undefined Yes, but not initialized Yes, but not initialized Temporal Dead Zone (TDZ) No Yes Yes Global Object Property Yes No No Block-level Declaration No Yes Yes Constant Nature No ...

The Evolution of JavaScript: A Comprehensive Look at ECMAScript Versions JavaScript, one of the most popular programming languages in the world, is based on the ECMAScript (ES) standard. Over the years, ECMAScript has evolved significantly, introducing new features and improvements that have shaped the modern JavaScript we use today. In this post, we'll explore the key ECMAScript versions, highlighting the most important features that have been added along the way. ECMAScript 1 (1997) – The Beginning The first version of ECMAScript established the basic syntax and functionality of JavaScript. ECMAScript 2 (1998) – Minor Update This version was a minor update, mainly for aligning with the ISO/IEC 16262 international standard, without any major new features. ECMAScript 3 (1999) – First Major Expansion This version introduced several important features that made JavaScript more powerful: Regular Expressions: A way to match patterns in strings. Try/Catch: Err...

Creating patterns using loops is a common exercise to understand iteration and control flow in programming. In this article, we'll explore a JavaScript program that prints a diamond pattern using stars ( * ). We'll also provide a Python version of the same pattern, analyze its time and space complexity, and highlight important points to consider. The Diamond Pattern Code JavaScript Version let rows = 5; // Upper part of the diamond for (let fh_col = 0; fh_col Python Version rows = 5 # Upper part of the diamond for fh_col in range(rows): output = "" # Add spaces for ft in range(fh_col, rows - 1): output += " " # Two spaces for alignment # Add left side stars for mt in range(fh_col): output += "* " # Add middle and right side stars for lt in range(fh_col + 1): output += ...