Prerequisites: Ruby, Rails, Active Record CRUD and Javascript

When you start learning web-development with rails, you start by understanding the fundamentals of an MVC Framework. Once through the basics, blog is the first application for most of us. But we evolve quickly into more complex applications, thanks to DHH and the Rails Community. Any application you build would require authentication and perhaps the ability for two-factor authentication for your users.

In this guide, we will start with a brand new rails application, will add devise and add two factor authentication to the application.

Have you ever wanted to get a specific data from another website but there's no API available for it? That's where Web Scraping comes in, if the data is not made available by the website we can just scrape it from the website itself.

But before we dive in let us first define what web scraping is. According to Wikipedia:

{% blockquote %} Web scraping (web harvesting or web data extraction) is a computer software technique of extracting information from websites. Usually, such software programs simulate human exploration of the World Wide Web by either implementing low-level Hypertext Transfer Protocol (HTTP), or embedding a fully-fledged web browser, such as Internet Explorer or Mozilla Firefox. {% endblockquote %}

If you just want to fix the issue quickly, scroll down to the "solution" section below.

If you're a Homebrew user and you installed node via Homebrew, there is a major philosophical issue with the way Homebrew and NPM work together. If you install node with Homebrew and then try to do npm update npm -g, you may see an error like this:

$ npm update npm -g