Sometimes you might want to check a short link for it's destination before clicking on it. Additional you get information about the redirects. Use the magic + at the end...
...of the short url! Google: https://goo.gl/TXe0Kx => https://goo.gl/TXe0Kx+ Since the original publication of this post, Google's URL shortening service goo.gl has been discontinued. Bitly:
This is a small example on how you can check if your Postgres index can be used by a specific query in you Rails application. For more complex execution plans...
...it might still be a good idea to use the same path of proof. 1. Identify the query your application produces query = User.order(:last_name, :created_at).to_sql
Using rem only ever makes sense when the root font size is dynamic, i.e. you leave control to the user. Either by a) respecting their user agent defaults, or...
...by b) offering multiple root font sizes in your application. By defining @media queries in rem, they will accommodate to the root font size of your page. At a larger...
...you store files for 500k records, that store_dir's parent directory will have 500k sub-directories which will cause some serious headaches when trying to navigate the file system...
...still only have 500 directories inside /app-root/public/users/avatar/. And inside each of them, at most 1000 sub-directories. But I have millions of files If you expect to store a lot...
git shortlog -s -n [commit-range] -n, --numbered Sort output according to the number of commits per author -s, --summary Suppress commit descriptions, only provide commit count [commit-range]
...tagname.. for "everything after that tag" Example output for spreewald: 60 Tobias Kraze 12 Henning Koch 7 Dominik Schöler 6 Thomas Eisenbarth 5 Martin Straub 3 Minh Hemmer...
In RSpec you can tag examples or example groups with any tags you like simply by saying describe ReportCreator, slow: true do # .. end describe ReportCreator do it 'generates reports', slow...
# ... end end You can then only run examples with these tags. rspec --tag slow rspec -t slow # Using the parallel_tests gem rake "parallel:spec[,,--tag slow]"
Sometimes you'll find yourself with a set of tasks that require similar code for different models. For example, if you start working at a new application that allows CRUDing...
...pears and apples, each commit might look similar to this: commit 41e3adef10950b324ae09e308f632bef0dee3f87 (HEAD -> ml/add-apples-12345) Author: Michael Leimstaedtner <michael.leimstaedtner@acme.com> Date: Fri Aug 11 09:42:34 2023 +0200 Add Apples...
...updates all your gems at once. Given that many gems don't care about stable APIs, this might break your application in a million ways. To stay sane, update your...
...This ensures that your libraries are up-to-date while it's easy to spot major version bumps which may break the app. Projects that have not been updated in...
When RSpecs runs the first feature spec, you may see log output like this: Capybara starting Puma... * Version 6.5.0, codename: Sky's Version * Min threads: 0, max threads: 4
...on http://127.0.0.1:39949 You can disable this behavior by tweaking Capybara's Puma server in your spec/support/capybara.rb: Capybara.server = :puma, { Silent: true } Note You don't need to configure this...
...the following content: class AddAttachmentToNotes < ActiveRecord::Migration[6.0] def change add_column :notes, :attachment, :string end end Don't forget to rename the class and change the column details to...
...you access http://yourpage.com/system/attachments. 3) Using expiring URLs There are also option to generate self-expiring URLs, which might be a good compromise between performance and safety. It is...
...and Redis.current=: `Redis.current=` is deprecated and will be removed in 5.0. If your application still uses Redis.current, you can only fix it by no longer using it. Here is how...
...There is probably already a constant like REDIS_URL that you use to configure Sidekiq or similar. So just use that one. redis = Redis.new(url: REDIS_URL) redis.get('example') # instead...
In most projects I know, Cucumber test suite speed is not an issue. Of course, running 350 features takes its time, but still each test for itself is reasonably fast...
...There is nothing you can do to fundamentally speed up such a test (of course, you should be using parallel_tests). However, in projects that go beyond clicking around in...
...is much more than a lightweight wrapper around Ruby's net/http. In particular: A single HTTPClient instance can re-use persistent connections across threads in a thread-safe way.
...a custom and configurable SSL certificate store (which you probably want to disable by default) Manages cookies Can make asynchronous requests (spins off a thread internally) Allow to set a...
In my experience, the most common sources of memory leaks are APIs like these: addEventListener. This is the most common one. Call removeEventListener to clean it up. setTimeout / setInterval. If...
...you create a recurring timer (e.g. to run every 30 seconds), then you need to clean it up with clearTimeout or clearInterval. (setTimeout can leak if it’s used like...
The Web Animations API has great browser support, and you should be using it to animate DOM elements from JavaScript, or to control or wait for CSS animations.
...Its API probably a bit different from how your favorite frontend framework animates, but simple enough to get used to. Like for CSS animations, you specify keyframes to animate. This...
It's possible to implement simple custom RuboCop cops with very little code. They work exactly the same like existing rubocop cops and fail the pipeline if they find an...
...offense. This is handy for project specific internal rules or conventions. The following cop looks at every ruby file and searches for TODO or WIP comments and adds an offense...
Let's say you want to find the element with the text hello in the following DOM tree: hello world You might think of XPath's contain() function: page.find(:xpath...
...contains(text(), 'hello') and not (./*[contains(text(), 'hello')])]") With jQuery jQuery has a custom selector :contains() that you can use in the same fashion: $(":contains('hello'):not(:has(:contains('hello...
ActiveSupport (since 4.1) includes test helpers to manipulate time, just like the Timecop gem: To freeze the current time, use freeze_time (ActiveSupport 5.2+): freeze_time To travel to a...
...specific moment in time, use travel_to: travel_to 1.hour.from_now Important When freezing time with #travel_to, time will be frozen (like with freeze_time). This means that your...
The standard way to abort async code is that your function takes a AbortSignal { signal } property. The caller can use this signal to send an abort request to your function...
...with a new DOMException('Message here', 'AbortError') when canceled. This already has good browser support and can be polyfilled on older browsers. Example Here is an async function countDown(). It...
...automatically. If you delete records regularly, this may be an annoyance. Here is a solution which was adapted from the Carrierwave GitHub wiki and cleans up any empty parent directories...
class ExampleUploader < CarrierWave::Uploader::Base storage :file after :remove, :remove_empty_container_directory def store_dir # You implemented this in your uploaders already. end def remove_empty...
Don't sum up columns with + in a sql-query if NULL-Values can be present. MySQL and PostgreSQL cannot sum up NULL values with the + value. The sum value...
MySQL: mysql> select 1 + 2 + 3; +-----------+ | 1 + 2 + 3 | +-----------+ | 6 | +-----------+ 1 row in set (0,00 sec) mysql> select 1 + NULL + 3; +--------------+ | 1 + NULL + 3 | +--------------+ | NULL...
...of passwords for the root user and you prefer using a password for root. Solution Step 1 is getting a root mysql shell that allows us to change user credentials...
...and MySQL since they share names of binaries. sudo systemctl stop mysql sudo mysqld_safe --skip-grant-tables & This starts the mysql daemon in the background and we can now...
If validations failed for a record, and you want to find out if a specific validation failed, you can leverage ActiveModel's error objects. You rarely need this in application...
...name (e.g. :blank for :presence, :taken for :uniqueness). You may also use where to see all errors of an attribute: >> user.errors.where(:email) => [#<ActiveModel::Error attribute=email, type=blank, options={}>]
Cucumber up to version 2 had a neat feature called Step Argument Transforms which was dropped in favor of Cucumber 3 ParameterTypes. While I strongly encourage you to drop your...
...keep the exact same functionality of your old Transforms while writing them in the style of new ParameterTypes. Why would I want to keep my Transforms? Transforms allowed you to...