...are usually believed to have worse performance than those defined via def. Hence, developers sometimes prefer using class_eval to define methods using def, like this: class_eval "def #{attribute...
...for_realsies?; do_things; end" You can benchmark methods defined like this and will see that those defined via def actually do perform better. Basically, it ranks like this:
...version understands? Did you double-check your @font-face declarations with all the hacky syntax that is required? Compare them with other declarations you find on the web.
...same name? This usually leads to trouble, but there are workarounds. Do IE's security settings prevent the download of webfonts? (see below) IE Security Settings can prevent font download...
Note: You won't need this for single lines of text. In this case it is better to just use the text-overflow property: Use CSS "text-overflow" to truncate...
...use -webkit-line-clamp in your CSS/SASS to natively render an ellipsis (...) after a specific amount of lines for a multi-line text in your HTML. Earlier, it was necessary...
...in "Comment" with: """ This is a long comment. With multiple lines. And paragraphs. """ The step definition is part of the spreewald gem
A recent patch level Ruby update caused troubles to some of us as applications started to complain about incompatible gem versions. I'll try to explain how the faulty state...
...care of a few things: The new Ruby version is installed The Bundler version stated in the Gemfile.lock is installed Geordi is installed (for database dumps) The gems of the...
When giving a presentation where you do some coding, the font size you usually use is probably a bit too small and makes code hard to read for users on...
...smaller screens or low-bandwidth connections when the image quality is lower. Here are two solutions. Presentation Mode RubyMine offers a "Presentation Mode" which you can use. Simply navigate to...
...a new callback to your model that (e.g.) caches some data when it is saved. Now you need to run that callback for the 10000 existing records in the production...
Write a clever migration, possibly by embedding the model into the migration script. Open the Rails console after deployment and re-save every single record. You should probably...
When internationalizing your Rails app, you'll be replacing strings like 'Please enter your name' with t('.name_prompt'). You will be adding keys to your config/locales/*.yml files over...
...the right place is a challenging task. The gem i18n-tasks has you covered. See its README for a list of things it will do for you. Note
When you do a bitwise copy using the dd tool you will not see any output until it completes or an error occurs. However, you can send a command signal...
...to the process to have it show its progress so far. From another terminal, simply call (be root or use sudo): pkill -USR1 dd This makes dd write something like...
...listen to other events. Quirks The "default behavior" in this case is not to show an alert, and preventing this default means the alert is being shown. In ancient browsers...
...customize the alert text, but this is no longer possible. You might want to set event.returnValue = true, as a truthy returnValue was necessary to trigger the alert in Chrome...
...a web developer, you know Google Analytics (GA). Probably you've dropped the GA snippet into more than one website, maybe you've even used its Javascript API to implement...
...configurable without changing anything in the application's code base (and much more beyond, see below). Only prefer GTM if the customer requests it, or if he is updating his...
...at the same time. When assets did not change, we do not want to spend time compiling them. Here is our solution for all that. Its concept should work for...
...all test suites. Copy the following to config/initializers/webpacker_compile_once.rb. It will patch Webpacker, but only for the test environment: # Avoid hardcoded asset hosts in webpack, otherwise all chunks would be loaded...
Let's say we have posts with an attribute title that is mandatory. Our example feature request is to tag these posts with a limited number of tags. The following...
...In most cases you want to use Option 4 with assignable values. The basic setup for all options looks like this: config/routes.rb Rails.application.routes.draw do root "posts#index" resources :posts, except...
Let's say you have a form that you render a few times but you would like to customize your submit section each time. You can achieve this by rendering...
...form partial as layout and passing in a block. Your template or partial then serves as the surrounding layout of the block that you pass in. You can then yield...
When testing your command line application with Aruba, you might need to stub out other binaries you don't want to be invoked by your test. Aruba Doubles is a...
Install the gem as instructed by its README, then put this Before block somewhere into features/support: Before do ArubaDoubles::Double.setup prepend_environment_variable 'PATH', ArubaDoubles::Double.bindir + ':' end
...If you are plucking from the id column in particular you can also say: User.active.ids => [1, 5, 23, 42] For a DISTINCT selection, use distinct on your scope (not the...
...resulting array). Article.distinct.pluck(:state) # SELECT DISTINCT state FROM articles => ['draft', 'published'] In Rails 3 and 4 you must use uniq instead of distinct: Article.uniq.pluck(:state) # SELECT DISTINCT state FROM articles...
Sometimes we write plain SQL queries in migrations so we don't have to mock ActiveRecord classes. These two migrations do the same: class Migration1 < ActiveRecord::Migration[5.2]
...Migration2 < ActiveRecord::Migration[5.2] def up add_column :users, :trashed, :boolean update("UPDATE users SET trashed = #{quoted_false}") end end The plain SQL migration is less code, but has a...
tl;dr: Ruby's Bundler environment is passed on to system calls, which may not be what you may want as it changes gem and binary lookup. Use Bundler.with_original...
...env to restore the environment's state before Bundler was launched. Do this whenever you want to execute shell commands inside other bundles. Example outline Consider this setup: my_project/Gemfile...
The issue: You are using stub_const to change a constant value for your test. stub_const "SomeClass::CONST", 'test' All of a sudden, tests fail with undefined method 'some...
...method' for # . The reason When using stub_const before the Class containing the constant has been loaded, a module is automatically created with the name. Since RSpec does no autoloading...
...optimize the experience. Using capistrano-rails capistrano-rails is a Gem that adds Rails specifics to Capistrano, i.e. support for Bundler, assets, and migrations. While it is designed for Asset...
...Pipeline (Sprockets) assets, it can easily be configured for Webpacker. This brings these features to the Webpacker world: Automatic removal of expired assets Manifest backups # config/deploy.rb # No need to include...
Most browsers have built-in drag and drop support for different page elements like text and images. While this may be useful in most situations, it may become annoying in...
...functionality. This does no longer work. You may now achieve this by explicitly preventing the startdrag-event:
const noDragElement = document.querySelector('no-drag-pls') noDragElement.addEventListener('dragstart', event => event.preventDefault())
jQuery's removeClass removes the given class string from an element collection. If you want to remove multiple/unknown classes matching a given pattern, you can do that. For example, consider...
...node for the following HTML. We'll reference it by $element below. Option A: Selecting classes, then removing them You can iterate over existing classes, and select matching ones. The...
In Rails, we usually have a mailer setup like this: class MyMailer < ActionMailer::Base def newsletter mail to: 'receiver@host.tld', from: 'sender@host.tld', subject: 'My mail' end end If you want to...
...Rails will print the mail's text representation to your log/development.log. You may also save this output as-is to an .eml file and open it with your mail client...
In a nutshell: return statements inside blocks cause a method's return value to change. This is by design (and probably not even new to you, see below) -- but can...
...a problem, for example for the capture method of Rails. Consider these methods: def stuff puts 'yielding...' yield puts 'yielded.' true end We can call our stuff method with a...