Today, many web applications will feature pages that are publicly available — like a homepage — and more secure ones where a user has to log in to get access. The process of user registration, logging in, and tracking user session state is called "authentication". At the same time, when dealing with logged-in users, it's necessary to separate actions and resources that are available to them depending on their user roles. For example, "admins" generally have more access than normal users.

This article explores how to use markdown in Ruby. Learn how to use two popular Ruby libraries—Redcarpet and Kramdown—to parse markdown and create a simple documentation app using Redcarpet and Sinatra.

Ractor is Ruby's new Actor-like concurrency abstraction—it lets execute code in parallel without worrying about thread safety. This article is an excellent introduction to Ractors and how to begin using them in your Ruby code.

People complain that Ruby isn't fast. Stripe—one of the world's largest and most influential Ruby shops—is working hard to change that. In addition to type-checking, this article explores a new, ahead-of-time Ruby compiler Stripe is developing as a part of their Sorbet Ruby Gem.

A bundle install command in Ruby is used to install all of a project's dependencies. But occasionally, this command could falter and issue an error. Numerous variables might be to blame for this issue, and fixing it might prove challenging. In this post, we’ll go through some of the typical reasons for bundle install errors in Ruby along with solutions.

ActiveRecord::RecordNotFound in Ruby is an error that occurs when an application is unable to find a record in the database that corresponds to the provided parameters. ActiveRecord is a Ruby gem that is used to interact with databases in a Rails application. It provides an object-relational mapping (ORM) layer that allows us to work with database records as if they were Ruby objects.

Memory leaks are a pain for gem users. They are hard to track and can lead to expensive infrastructure costs. Memory leaks within a C extension are even worse. You'll see a lot of tools and articles about finding leaks in Ruby. However, you don't have the same access to internals in C. A naive usage of rb_funcall can cause memory leaks: it's much better to use rb_protect instead. So, if you are a C extension writer, please read on for the sake of developers who will use your gem. Let's get started!

The ActionController::UnpermittedParameters error occurs when a parameter that has been passed is not permitted in a create, an update, or a user-defined action. In older versions of Rails, information about the unpermitted keys was provided in the logs only when an unpermitted parameter was found in a request. This did not provide enough information for the developers to understand which controller and action received the unpermitted parameters.

Exceptions are unintended events that take place when a program is being executed or during its runtime causing disruptions to the program's overall logic. In Ruby, a program is enclosed between the begin and end blocks and a rescue block is used to tell what types of exceptions are to be handled. When no class is specified, by default, a RuntimeError is raised by Kernel#raise.

Ruby is a wonderful language, made for humans first and machines second. It is easy to read and write. There are plenty of ways to write anything, and you can often guess its standard library by typing the name of the method you would have chosen yourself. Because of this, Ruby's arguments are very flexible, which lets us express our APIs very clearly. But this comes with a drawback: Ruby is quite hard to parse for C extension developers!