The attached compiler() function below applies JavaScript behavior to matching HTML elements as they enter the DOM. This works like an Unpoly compiler for apps that don't use Unpoly...
} Enumerable#index_with (Rails 6+) To generate a hash where array elements become hash keys, and values are calculated from them, use index_with. users = User.all
For string columns, MySQL indexes the left side of a string. That means an index can speed a like query...
To allow HTTP 304 responses, Rails offers the fresh_when method for controllers. The most common way is to pass...
Rails offers a way to prepend (or append) view paths for the current request. This way, you can make the...
...record, :match_requests_on).except(:example_group) VCR.use_cassette(name, options) { example.call } end end Behaviour If a spec is not tagged with :vcr, VCR will complain about any attempted HTTP...
...request. This is the default behaviour. If you want to turn this off temporarily, e.g. to communicate with an actual API while writing a new spec, simply add the line...
...you will sign out your current user whenever you switch to another app. A better way is to use our own daho.im service. All daho.im subdomains resolve to your local...
Simplecov is a code coverage tool. This helps you to find out which parts of your application are not tested...
This page lists many query methods and options in ActiveRecord which do not sanitize raw SQL arguments and are not...
...using a multiple assignment for a Regex are named groups. Especially when your Regex becomes more complicates it is easier to understand and to process. Note: In case a string...
Rails 7.1 added the normalizes method which can be used to normalize user input. It lets you define the fields...
Rails is split into a large number of (sub-) frameworks. The most important and central of those are activesupport (extends...
...lockfile carefully when submitting a commit. Note that the approach in this card works best, if you use yarn outdated or npm outdated together with yarn upgrade some_package or...
...more information about this issue. In Rails3+ you can also disable this annoyingly clever behavior. Why this is bad This has some develish implications for your deployment, because scopes written...
...t notice this during development. Let's say you have a model Note which belongs to an Author and has a string column category: class Note < ActiveRecord::Base
...API (notable methods and properties) video = document.querySelector('video') video.play() video.pause() video.load() // Reset to the beginning and select the best available source video.currentSrc // The selected source video.currentTime // The current playback time...
There's a method Integer() defined on Kernel, that typecasts everything into an Integer. Integer("2") # 2 Integer("foo") # Invalid...
...API design, I thought it might be nice to write down a set of best practices. And poke fun at a couple widely-used APIs. Much of this may be...
...all routes, but may return early, a change has been introduced to add lazy behavior by adding an iterator block and yielding. This change breaks the adapter patch in routing...
Development environment setup Rails Composer Basically a comprehensive Rails Template. Prepares your development environment and lets you select web server...
All major browsers (IE8+, FF3.5+, Safari 4+, any Chrome) support sessionStorage, a JavaScript storage object that survives page reloads and...
Tested on Ubunut 22.04 1. Opener script Create a file ~/.local/bin/coverage_zip_opener with: #!/bin/bash tmp_folder="/tmp/coverage-report-opener" if [ -z "$1" ]
We structure our CSS using the BEM pattern. Our naming convention for blocks, elements and modifiers has evolved over the years. This card shows our current style and various alternative...
...not mix styles and be consistent within a given project. Current convention Our current BEM naming convention looks like this:
Note how the modifier just starts with a dash (-pro...
Rails' default logger prefixes each log entry with timestamp and tags (like request ID). For multi-line entries, only the...
Let the following setup: # my_model_spec.rb describe MyModel do it 'perfoms a test' it_behaves_like 'something shared' end # something_shared.rb shared_examples_for 'something shared' do it 'does something'
...a test' is spec/models/my_model_spec.rb[1:1]. The ID of the ExampleGroup created by it_behaves_like 'something shared' is spec/models/my_model_spec.rb[1:2] as it is the second ExampleGroup in the...