Ruby On Rails

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Backward-compatible database migrations

Backward-compatible database migrations Our deployment process performs database changes about a minute before the related code changes go live. During this time, Rails might run database queries using an out-of-date schema, erroring out. As the usage of our app continues to increase, e...

Handling Ruby 2.7 deprecations warnings

Handling Ruby 2.7 deprecations warnings In Ruby 3.0, positional arguments and keyword arguments will be separated. For now ruby 2.7 brings deprecations warnings that notifies us that our code should be updated. In most cases adding or removing ** should fix the problem but the question ...

Yukihiro Matsumoto interview for Evrone company (in English)

Yukihiro Matsumoto interview for Evrone company (in English) We’re thrilled that our good friend Yukihiro Matsumoto, creator of the Ruby programming language, has been able to join us at RubyRussia 2019 as a speaker for the second time, having previously spoken three years ago at RubyRussia 2016.In the time...

Rails: Policy Objects Implementation

Rails: Policy Objects Implementation Policy Objects encapsulate and express a single business rule.In our applications we might have different business rules coded mostly as if-else or switch statements. These rules represent concepts in your domain like whether “a customer is eligib...

Why is Ruby on Rails' default_scope bad?

Why is Ruby on Rails' default_scope bad? A pretty popular opinion in the Ruby on Rails community is that default_scopes should not be used for any reason. However, often it's not fully explained why default_scopes are harmful to applications. Default Scopes are harmful because they are u...

My top five Rails performance tips for performance noobs

My top five Rails performance tips for performance noobs Performance is a topic that’s widely discussed and also, sadly, widely misunderstood.I’m going to share five performance tips that have worked well for me in my 9 years of using Rails and even before that, since much of what’s here is technology-...

Easy machine learning with Ruby using Rumale

Easy machine learning with Ruby using Rumale Rumale (Ruby machine learning) is a machine learning library in Ruby. Rumale provides machine learning algorithms with interfaces similar to Scikit-Learn in Python. Rumale supports Linear / Kernel Support Vector Machine, Logistic Regression, Linea...

Rails 6 - Notable Changes in Railties Module

Rails 6 - Notable Changes in Railties Module The good news is Rails 6 is officially out and there are some changes and deprecations are shipped with it. Let’s walk through the notable changes shipped in the Railties module.

The World Follows Power Laws: Why Premature Optimization is Bad

The World Follows Power Laws: Why Premature Optimization is Bad Programmers vaguely realize that 'premature optimization is bad'. But what is premature optimization? I'll argue that any optimization that does not come from observed measurement, usually in production, is premature, and that this fact stems from...

Basic Design Patterns in Ruby on Rails

Basic Design Patterns in Ruby on Rails Not only as programmers, but in day-to-day life, we encounter some problems. Every person has similar difficulties, and our society has found universal ways, patterns, to solve that problems. As programmers we also have problems, which can be solv...

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