• Category Archives: Software

[ActiveRecord] Get a polymorphic owner class out of the owned object

The question is: how can we retrieve a owners class of a polymorphic association without loading the owner object into memory? Solution There are (at least) two ways to do this. First one is not recommended (as it might fail with multiple namespaces with same class names, etc: or a better one that will work […]

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Karafka (Ruby + Kafka framework) 0.5.0 release details

I’m proud to announce that we’ve released a new shiny version of Karafka: Framework used to simplify Apache Kafka based Ruby applications development. In this article I will cover all the important changes and new features that you will be able to use. Karafka? But what is it? Karafka provides a higher-level abstraction than raw […]

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Dry-Configurable lazy evaluated default settings

Dry-configurable is  a simple mixin to make Ruby classes configurable. It is quite nice, uses Struct and allows you to have default values. Unfortunately, it does not support (yet hopefully) default values that are evaluated upon each setting key request. When would that be useful? Let’s take a simple example: Kafka + Zookeeper. Zookeeper stores […]

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Errbit + HTTPS: Setting up Errbit reporter (Airbrake v5 gem) to work with self-signed HTTPS certificate

Note: If you’re using old Errbit version (0.2.0, 0.4.0) and an old Airbrake version (v4) please refer to this manual to make it work with self-signed certificates. Having an error catcher like Errbit behind SSL is generally a good idea. Especially when Errbit is hosted on a different server than you application (for example when […]

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Integrating Trailblazer and ActiveRecord transactions outside of a request lifecycle

When you use Ruby on Rails with ActiveRecord, you can get used to having separate transaction on each request. This is valid also when using Trailblazer (when inside of a request scope), however Trailblazer on its own does not provide such functionality. It means that when you’re using it from the console and/or when you […]

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