Ruby On Rails

Tutorials

How to deal with complex Factory Bot associations in RSpec tests

How to deal with complex Factory Bot associations in RSpec tests What’s the best way to handle tests that involve complex setup data? You want to test object A but it needs database records for objects B, C and D first.I’ll describe how I address this issue but first let me point out why complex setup data is a...

A nice shortcut for group count queries

A nice shortcut for group count queries A nice shortcut for group count queriesVisit.top(:browser)instead ofVisit.group(:browser).where("browser IS NOT NULL").order("count_all DESC, browser").countBe sure to sanitize user input like you must with groupAlso works with arrays and hashes["...

Recyclable cache keys in Rails

Recyclable cache keys in Rails Recyclable cache keys or cache versioning was introduced in Rails 5.2. Large applications frequently need to invalidate their cache because cache store has limited memory. We can optimize cache storage and minimize cache miss using recyclable cach...

Ruby Service Objects without gems

Ruby Service Objects without gems Sometimes we use gems like Trailblazer or Interactor just to separate business logic from controllers and models, and sometimes, a couple of PORO's and a simple convention is enough:Here is a general outline of my favourite set of conventions for ...

Ruby Infinity: How It Works

Ruby Infinity: How It Works What is infinity in Ruby?It’s something that has a starting point but no ending.In Ruby, we can express this concept of infinity with the Float::INFINITY constant.You may be wondering how this is useful.Let me explain with examples!.

Rails 6 adds support for Optimizer Hints

Rails 6 adds support for Optimizer Hints Many relational database management systems (RDBMS) have a query optimizer. The job of the query optimizer is to determine the most efficient and fast plan to execute a given SQL query. Query optimizer has to consider all possible query execution ...

Migrate tags in Rails to PostgreSQL array from ActsAsTaggableOn

Migrate tags in Rails to PostgreSQL array from ActsAsTaggableOn ActsAsTaggableOn is a swiss army knife solution if you need to add tags to your ActiveRecord model.Just by adding one gem to your Gemfile and acts_as_taggable to the model you get everything you need: adding tags, searching for a model by tag, get...

Launch: Autoscaling Sidekiq on Heroku

Launch: Autoscaling Sidekiq on Heroku “We have a very uneven Sidekiq workflow with a large number of jobs that get enqueued overnight. Rails Autoscale lets us get those jobs done quickly without paying for idle workers most of the day.” —Geoff, worker autoscaling beta userIt’s been my...

3 Defensive Programming Techniques for Rails

3 Defensive Programming Techniques for Rails Incidents happen all the time because of bad code deploys. You write some code that passes code review, it then is automatically shipped to production after a test suite passes, and BAM, an outage happens. This fairly common occurrence has ways to...

Algebraic effects for Ruby

Algebraic effects for Ruby Affect is a tiny Ruby gem providing a way to isolate and handle side-effects in functional programs. Affect implements algebraic effects in Ruby, but can also be used to implement patterns that are orthogonal to object-oriented programming, such a...

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