Recently, in BookingSync, we were performing a migration from Karafka 1.4 to 2.0, which we use for communication with Kafka. One of the great features available in version 1.4 was a custom partition assignment strateg... Read on →
Service objects and/or after_commit callbacks are ubiquitous in most real-world Rails applications. Whether it’s a good idea or not (ActiveRecord callbacks - I’m looking at you) is a different story, but one thing tha... Read on →
Recently, I’ve had an unfortunate opportunity to deal with a very unexpected issue with Kafka that had quite terrible consequences. The exact origin of the issue is yet to be discovered; nevertheless, the process lead... Read on →
Imagine that you are building a separate application for your e-commerce system dedicated to business intelligence. In other words, you want to calculate some stats for the orders. So you are going to create some new ... Read on →
This is the fourth and also the last part of the Kafka For Rubyists mini course. If you are interested in other parts of the course, please check them out here. Read on →
This is the third part of the Kafka For Rubyists mini course. If you are interested in other parts of the course, please check them out here. Read on →
This is the second part of the Kafka For Rubyists mini course. If you are interested in other parts of the course, please check them out here. Read on →
This is the first part of the Kafka For Rubyists mini course. If you are interested in other parts of the course, please check them out here. Read on →
I’ve been recently planning to record a couple of tutorials for my team in BookingSync, focusing mostly on monitoring and some other more advanced aspects of Kafka and Karafka. But if I was already recording something... Read on →
If you’ve ever had a need to implement an audit log to track all the changes that get persisted for all or at least some models in your application, there is a good chance that you’ve encountered PaperTrail gem that m... Read on →
Imagine that you are implementing a payment processing system for the e-commerce system and discover that multiple customers were charged twice for exactly the same order. Ouch… Sounds like a real nightmare to deal wi... Read on →
Communication between two or more applications is often everyday stuff, and it might seem that there is not too much to add there as this subject has been covered pretty well in the last years. Thanks to that, multipl... Read on →
In the typical Rails application, you can find the most of the validations in the ActiveRecord models, which is nothing surprising - ActiveRecord models are used for multiple things. Whether it is a good thing, or a b... Read on →
Optimizing database queries is arguably one of the fastest ways to improve the performance of the Rails applications. There are multiple ways how you can approach it, depending on the kind of a problem. N+1 queries se... Read on →
One very useful feature of ActiveRecord is automatically defining attribute readers and writers for all the columns for given tables. For the ones with boolean type, however, there is one more addition - defining an a... Read on →
As hard as it is for me to believe, I already have over 5 years of professional experience in Ruby and Rails. Throughout all these years my attitude towards Rails has been fluctuating between going from blind love to ... Read on →
Executing background jobs is quite a common feature in many of the web applications. Switching between different background processing frameworks used to be quite painful as most of them had different API for enqueuin... Read on →
Every now and then I discover some features in Rails that are not that (arguably) commonly used, but there are some use cases when they turn out to be super useful and the best tool for the job. One of them would defi... Read on →
Have you ever wondered how it is possible that calling class methods on mailers work in Rails, even though you only define some instance methods in those classes? It seems like it’s quite common question, especially w... Read on →
After publishing recent blog posts about table partitioning - its SQL basics part and how to use in in Rails application I was asked quite a few times what is the real performance gain when using table partitioning. T... Read on →
In the previous blog post we learned some basics about table partitioning: how it works and what kind of problems it solves. So far we've been discussing mostly basic concepts with raw SQL examples. But the essential ... Read on →
You've probably heard many times that the database is the bottleneck of many web applications. This isn't necessarily true. Often it happens that some heavy queries can be substiantially optimized, making them really ... Read on →
I was recently asked what is secret key base used for in Rails applications and why not secure value of it (or even worse - the public one!) creates a security issue. That was a really good question, I remember how it... Read on →
If you happen to develop API for non-trivial app with complex business logic beyond CRUD directly mapped to the database tables (i.e. typical Active Record pattern) you were probably wondering many times how to handle... Read on →
Having some kind of type attribute in your models is a pretty common thing, especially in applications with more complex domain. How do you handle such cases? Is it with multiple conditionals / case statements in ever... Read on →
Recently I've been repeatedly asked how to get started with programming, especially Ruby and Rails. To keep things DRY and make sure I always include all great resources for learning, I decided to write this blog post... Read on →
You are working currently on that awesome app and just started thinking about implementing new feature, let's call it feature X. What's the first thing you do? Rolling your own solution or... maybe checking if there's... Read on →
Last time, in part 1, I was giving some advice about testing - why to test at all, which tests are valuable and which are not, when to write acceptance tests and in what cases aim for the maximum code coverage. It bro... Read on →
Testing is still one of the hottest topics when it comes to developing maintainable and business-critical applications. Ruby on Rails community embraces the importance of writings tests, yet there are so little resour... Read on →
There’ve been a lot of discussions recently about applying Object Oriented Programming in Rails applications, how ActiveRecord callbacks make testing painful and how Rails makes it hard to do OOP the right way. Is it ... Read on →
Server setup with the entire environment for Rails applications can be quite tricky, especially when you do it for the first time. Here is step by step guide how to setup CentOS 6.4 server with a basic environment for... Read on →