Exercise 1: XML On the start page of your Movie DB, show the title of a random movie that is coming soon to theaters. There's an XML feed for...
...no longer a "Year" field when creating a movie. It is automatically fetched and stored before the movie is created. When editing a movie there is a "Year" field that...
...in licensing, we cannot provide Elasticsearch versions >= 8.0. Version 7.17.x will reach EOL status with the release of Elasticsearch version 9. We have decided to use OpenSearch as a...
...replacement, since it is a fork of Elasticsearch version 7.10.2, still running under the previous licensing model and wire-compatible. A more detailed reasoning can be found on their website...
Applications often show or hide elements based on viewport dimensions, or may have components that behave differently (like mobile vs desktop navigation menus). Since you want your integration tests to...
...behave consistently, you want to set a specific size for your tests' browser windows. Using WebDriver options / Chrome device metrics For Google Chrome, the preferred way is setting "device metrics...
...method for controllers. The most common way is to pass an ActiveRecord instance or scope, and fresh_when will set fitting E-Tag and Last-Modified headers for you. For...
...scopes, an extra query is sent to the database. fresh_when @users If you do not want that magic to happen, e.g. because your scope is expensive to resolve, you...
If you've stumbled over display: grid while reading the Flexbox material of the previous card - we've got you covered! Let's dive into this topic with a quote...
...dimensional layouts and Grid is made for two-dimensional layouts. You will learn more subtle differences in the linked material below, but you can remember this as a rule of...
Action Mailer Basics and Previews Chapter "Task H1: Sending Confirmation Emails" from Agile Web Development with Rails (in our library) Ensure that the receiving e-mail is valid
...the Truemail gem to validate e-mail addresses Ensure that development and staging are not sending out e-mails by accident Rails: How to write custom email interceptors
Rails wraps your parameters into an interface called StrongParameters. In most cases, your form submits your data in a nested structure which goes hand in hand with the strong parameters...
...However, there are cases where this does not fit your use case, or has side effects. If you do it differently, be extra careful not to introduce security issues.
With Ubuntu 24.04 it's not longer possible to setup FDE with BTRFS The new installer won't offer you any options for manually created dm-crypt volumes
...btrfs subvolume snapshot . @ rmdir @/ext2_saved ls | grep -Ev "@|ext2_saved" | xargs rm -rf btrfs subvolume set-default @ Create additional subvolumes btrfs subvolume create @home cp -ax --reflink=always @/home/* @home...
...for file uploads. CarrierWave has an integrated processing mechanism for different file versions with support for ImageMagick through CarrierWave::MiniMagick (which requires the mini_magick gem). In case your processing...
...runs into an error, CarrierWave will just swallow it and rethrow an error with a very generic message like Processing failed. Maybe it is not an image? which does not...
makandra's development process Learn about our process. The squares represent the state of the issue in Linear: In particular you should understand: Why do we have a process?
...is an issue (formerly: story)? What metrics does our process optimize for? How to divide large requirements into issues. When is an issue too small, when is it too large...
Debouncing a method call delays its execution until after a specified time has passed. If it's called again before that time has passed, its execution is delayed again.
...would be run more often than it needs to. One example for that are scroll event handlers in JavaScript: You want to react to a user scrolling, but it's...
...Adding Records via XHR and JS Example For the following examples we use a simple data model where a user has zero or more tasks. class ExampleMigration < ActiveRecord::Migration...
...user.tasks.build } end def update load_user @user.attributes = user_params if @user.save flash[:notice] = 'User saved successfully.' redirect_to(edit_variant_1_user_path(@user)) else flash[:notice] = 'User could not...
A JavaScript error in an E2E test with Selenium will not cause your test to fail. This may cause you to miss errors in your frontend code. Using the BrowserConsole...
!!driver_logs_proc end def driver_logs_proc browser = page.driver.browser if browser.respond_to?(:logs) # selenium-webdriver >= 4 proc { browser.logs } elsif browser.respond_to?(:manage) && browser.manage.respond_to?(:logs) # selenium-webdriver...
...notice that the records you create are not deleted and will bleed into your specs the next time you run them. You probably have DatabaseCleaner configured to take care of...
...not bloating your test database with old records: RSpec.configure do |config| config.before(:suite) do DatabaseCleaner.clean_with(:deletion) end config.before(:each) do DatabaseCleaner.strategy = :transaction end config.before(:each, transaction: false) do DatabaseCleaner.strategy...
Running rails server will start a local server that you can access via http://localhost:3000. When you are working on multiple web apps, they will likely set cookies with...
...generic names on localhost. This is annoying, since you will sign out your current user whenever you switch to another app. A better way is to use our own daho.im...
...been released just a few days ago, allowing us to use Webpack 4. I successfully upgraded an existing real-world Webpack 3 application. Below are notes on everything that I...
Note that we prefer not using the Rails asset pipeline at all and serving all assets through Webpack for the sake of consistency. Preparations Remove version locks in Gemfile...
...always is to prevent long-running queries in the first place, automatic timeouts can serve as a safety net to terminate problematic queries automatically if a set time limit is...
...statement due to statement timeout (PG::QueryCanceled)). If multiple SQL statements appear in a single simple-query message, the timeout is applied to each statement separately. Set the timeout globally...
The shell variable PS1 holds your bash prompt. You might want to change it to serve your needs best. Here is how to: General non-printing escape sequences in your...
=> ✔ mycomputer ~/projects/platforms master > _ # Arne's epic timestamped prompt with return status indicator and status-colored (green if fresh, or red if unstaged, or yellow if staged) git branch:
...with two matchers that test for equality. The first is toBe: expect(first).toBe(second) toBe passes when first === second. Unfortunately this is useless for non-primitive values because JavaScript...
...is a horrible language. However, Jasmine comes with another matcher toEqual: expect(first).toEqual(second) This matcher behaves as a human would expect for types like the following: Arrays
When you find similar groups of expect calls in your tests, you can improve readability by extracting the group into its own matcher. RSpec makes this easy by allowing matchers...
We can extract the repeated matcher chains into a custom matcher called be_shouting: expect(foo).to be_shouting expect(bar).to be_shouting Instead of re-implementing the...
The nokogiri gem provides different packages for several platforms. Each platform-specific variant ships pre-built binaries of libxml2, e.g. x86_64-linux includes binaries for 64bit Linux on Intel/AMD...
...This significantly speeds up installation of the gem, as Nokogiri no longer needs to compile libxml2. However, this also means that for each security issue with libxml2, Nokogiri maintainers have...
This card is a short summary on different ways of assigning multiple attributes to an instance of a class. Using positional parameters Using parameters is the default when assigning attributes...
...It works good for a small number of attributes, but becomes more difficult to read when using multiple attributes. Example: class User def initialize(salutation, first_name, last_name, street...
...Mocking the time zone You can't really change the local time zone of the Selenium-controlled browser. What you can do is change the time zone of the process...
...setting this from an individual test, since you don't know whether or not the Selenium-controlled browser has already launched. Note that we have only tested this with a...
Because your examples should not change global state, you should not need to care about the order in which RSpec processes your .rb files. However, in some cases you might...
...rb files in alphabetical order of their file paths by default (or when you specify --order defined). You run tests in random order by using --order random on the command...