Fresh Chrome installations now show a "Choose your search engine" popup in Europe. This might make your Cucumber tests fail. Fortunately there is a flag to disable the popup. Add...
...the following option to your chromedriver setup code: options.add_argument('--disable-search-engine-choice-screen') I found this flag in Peter Beverloo's list. Background: This was experienced locally with...
This card shows you how to format a card's content using Markdown. We use the Commonmarker interpreter, so here are examples for its dialect. Formatting **Bold** Bold _Italics_
Add a new line for a paragraph. Headlines Underline headlines with an equals sign or dash -- or start a line with a hash symbol: Hello World ----------- Lorem ipsum...
To update your Rubygems to the latest available version, type the following: gem update --system Note that you have a separate Rubygems installation for each Ruby version in your RVM...
...or rbenv setup. Updating one does not update the others. Ruby 1.8.7 If you are using Ruby 1.8.7 you cannot use the latest version of Rubygems. Type the following to...
Sometimes you want to write a test for a business rule that's based on multiple variables. In your goal to cover the rule thoroughly, you start writing tests for...
...each permutation of all variables. Quickly it blows up into something unsustainable. With n variables for the business rule, you get 2n permutations/test cases. This is manageable with 2 variables...
...ago and don't remember which one it is? You can go to chrome://settings/appearance (on Chrome 61+) to see the theme's name, and click a link to open...
...it in the Chrome Web Store. If you are on an older version, or if the above no longer works, you have to check Chrome's Preferences file. Linux /home/YOUR_USER_NAME/.config/chromium/Default/Preferences...
...need to use XPath, you can have Nokogiri help you out on creating it. Simply use Nokogiri's xpath_for: Nokogiri::CSS.xpath_for('#foo') # => ["//*[@id = 'foo']"] Nokogiri::CSS.xpath_for('#foo...
...bar:nth-of-type(2)') # => ["//*[@id = 'foo']//*[contains(concat(' ', @class, ' '), ' bar ') and position() = 2]"] Since XPath is more powerful you may still need to do some hardcore XPath hacking eventually...
...with modern CSS features In the past, you might have resorted to bulky JavaScript solutions or CSS hacks like transitioning between max-height: 0 and max-height: 9999px. All of...
...them were awkward and/or have several edge cases. With modern CSS, there is actually a way to do it properly: Just use a display: grid container which transitions its grid...
Angular directives with isolate scopes have three different variable binding strategies, of which one is =. Example: # HTML # Coffeescript @app.directive 'panel', -> scope: evaluated: '=value' bound: '=twoway' link: -> scope.evaluated # = false scope.bound = 'foo...
...bound with = (value, twoway) have their value evaluated as Angular expression in the parent scope's context and have the result assigned to the corresponding scope variable (evaluated, bound). It...
If you have ... an object that defines to_hash (may well be a simple Hash instance) and pass it to a method with optional arguments and keyword arguments
...it is not set as the first optional argument. Instead, Ruby calls to_hash on the object and tries to match the result to keyword arguments. If the hash contains...
Just found out about a great feature in Rails that seems to be around since Rails 2. Start a console with the --sandbox (or -s) parameter: rails console --sandbox
...database will be rolled back on exit. Warning Changes beyond the database (deleting files, sending emails, etc) cannot be rolled back...
...take the content-box for the element's shape, i.e. without margin, padding and border. shape-outside: content-box Set the margin where you want it, e.g. 10px left and...
Set the shape-margin to the same size as the margin. Note that the shape-margin can never exceed the (rectangular) margin-box of an element! --margin: 10px;
If others on a call (Skype, SIP, ...) can not hear you loud enough, your volume levels are probably too low. Also, Skype may be changing your mixer levels.
...proper recording volume Open your mixer software (run pavucontrol). Switch to input devices. If you have more than one recording device, find the correct one. Make a test call to...
If you want to see how long your database queries actually take, you need to disable MySQL's query cache. This can be done globally by logging into a database...
SET GLOBAL query_cache_type=OFF; and restart your rails server. You can also disable the cache on a per query basis by saying SELECT SQL_NO_CACHE...
...has to decide whether and how to do authorization. The usual approaches are: Using send_file with a regular controller. This is secure, but potentially slow, especially for large collections...
...This is fast (because Apache can deliver assets without going through Rails), but less secure. When going with the "unguessable URL" approach, it is possible to somewhat increase security by...
Stringex is a gem that offers some extensions to Ruby's String class. Ruby 1.9 compatible, and knows its way around unicode and fancy characters...
...Examples for stringex's String#to_url method: # A simple prelude "simple English".to_url => "simple-english" "it's nothing at all".to_url => "its-nothing-at-all"
Today I needed to execute a ruby gem executable with sudo. But, surprisingly, bash would tell me command not found for the gem that ran lovely without sudo.
...are installed to /var/lib/gems/1.8/bin, which is not in sudo’s PATH. Unfortunately, you can’t change the path, since sudo for Ubuntu is compiled with the --with-secure-path option...
Sometimes you may want to print files from the command line, especially when you have lots of them. You can use lp for that. To print a single example.pdf file...
...on your default printer, simply say: lp example.pdf lp accepts multiple filenames, so to print all PDF files in the current directory: lp *.pdf You can specify a printer via...
See the attached link for a useful overview of modern (and classic) DOM API methods, like matches, contains, append, cssText, etc. You will still need to look up some documentation...
...e.g. on how to modify a ClassList, but it's still better than browsing interfaces and superclasses of Element on MDN without knowing what to look for. When coming from...
The sprintf method has a reference by name format option: sprintf("% d : % f", { :foo => 1, :bar => 2 }) # => 1 : 2.000000 sprintf("%{foo}f", { :foo => 1 }) # => "1f" The format identifier % stands for...
...this example we are using %s identifier to replace strings. class Fetcher FIND_URI = 'https://someapi.com/3/search/record?query=% s&include_many=% s&language=en-US&page=1' # some public methods
...is edited by WSYIWYG-Editor but want some length checking nevertheless, you need to strip all tags and then the special characters: def hard_sanitize(text) ActionController::Base.helpers.strip_tags(text...
...gsub(/[^[:word:]]+/, " ") end :001 > hard_sanitize("This is beautiful markup ") => "This is beautiful markup" If you allready have nokogiri on board, you can use that as well, though it has...
Chromedriver (or selenium-webdriver?) will not reliably scroll elements into view before clicking them, and actually not click the element because of that. We've seen this happen for elements...
...a 40px button). Our assumption is that the element is considered visible (i.e. Capybara::Selenium::ChromeNode#visible? returns true for such elements) but the Selenium driver wants to actually click...
...when you work for clients from Europe or the US, there are two dominantish standards you should know about. Each of these has subtle differences. ISO 8601 This is adhered...
...to by most European countries. Weeks start on Monday and end on Sunday. To get the number of the weekday in Ruby as defined by ISO 8601, use Date#cwday...
Delegating methods to other objects is often helpful but the syntax of both def_delegators and def_delegator is a complete mess that makes your code hard to read.
...ActiveRecord::Base belongs_to :topic def_delegators :topic, :title, :category end Here, we can say Post.new.title and actually read title from the Post's Topic object. Because of what we...
The SQL code generated by Graticule's spherical distance computation is insufficient and can lead to NULL distances in edge cases. The reason for this is that MySQL is performing...
...several sine and cosine computations which can result in slight rounding errors -- which is usually okay. Rarely, though, for the exact center of the given circle, it is then asked...