All direct child directories of app are automatically added to the eager- and autoload paths. They do NOT create a...

On the Rails console, assigning an object to a variable can lead to this strange error (without stacktrace): irb > recipient...

TLDR Using .includes or .eager_load with 1-n associations is dangerous. Always use .preload instead. Consider the following ActiveRecord...

Most of our applications use CarrierWave for file uploads. CarrierWave has an integrated processing mechanism for different file versions with...

Given you have an array column like this: create_table "users", force: :cascade do |t| t.integer "movie_ids", default: [], array...

View specs are a powerful tool to test several rendering paths by their cases instead of using a more costing...

You don't want sensitive user data in your logs. Background Rails per default filters sensitive data like...

Disclaimer This card is a collection of guides and things to have in mind when upgrading to a specific version...

For my computer science bachelor's thesis I programmed and evaluated a CLI Test Case Prioritization (TCP) tool for makandra...

There are multiple ways to redirect URLs to a different URL in Rails, and they differ in small but important...

Rails' url_for is useful for generating routes from a Hash, but can lead to an open redirect vulnerability.

Rails' Strong Parameters enable you to allow only specific values from request params to e.g. avoid mass assignment.

An introduction to mangling When you minify ("compress", "optimize") your JavaScript for production, the names of your functions and variables...

Rails offers several methods to manage three types of different cookies along with a session storage for cookies. These...

It most cases it's not necessary to add a version constraint next to your gems in the Gemfile. Since...

Debugging your integration tests, that run a headless Chrome inside a docker image, is tricky. In many cases you can...

When you allow file uploads in your app, a user might upload content that hurts other users. Our primary concern...

Rack::SteadyETag was a Rack middleware that generates the same default ETag for responses that only differ in XOR-masked...

Every Rails response has a default ETag header. In theory this would enable caching for multiple requests to the same...

If your irb or rails console keeps randomly crashing and you can't figure out why then you can try...

In Ruby on Rails ActiveRecord::Relation#merge overwrites existing conditions on the same column. This may cause the relation to...

If you're using a Redis cache in Rails (e.g. :redis_cache_store), it's possible to configure additional parameters...

Maintaining larger projects makes it more difficult to balance refactoring and upgrade tasks according to its actual value. Consider to...

Let's say we have posts with an attribute title that is mandatory. Our example feature request is to tag...