By default, Twitter Bootstrap's print styles include printing links. /* Bootstrap's way of printing URLs */ @media print { a[href]:after { content: " (" attr(href) ")"; } } If you want to turn that...
There are several ways to merge two (or more) PDF files to a single file using the Linux command line. If you're looking for graphical tools to edit or...
...annotate a PDF, we have a separate card for that. PDFtk (recommended) PDFtk is a great toolkit for manipulating PDF documents. You may need to install it first (sudo apt...
...context) is run outside of transactions, so data created here will bleed into other specs before(:example) is run before each spec inside it, Generally, you'll want a clean...
...setup for each spec so that they are independent of other specs in the same context. Example Consider this spec: describe User, 'something' do before :context do @user = User.make
We use CarrierWave in many of our projects to store and serve files of various formats - mostly images. A common use case of CarrierWave's DSL is to "process" the...
...versions", for example different resolutions of the same image. Now we could go one step further: What if we want to create versions that have a different file extension than...
Ubuntu has a package mysql-sandbox that lets you install multiple MySQL versions into your user home: Install mysql-sandbox sudo apt install mysql-sandbox Download the version of MySQL...
...you want to use from mysql.com: https://dev.mysql.com/downloads/file/?id=480427 Make sure to choose "Generic Linux" instead of "Ubuntu" so you get a .tar.gz instead of .deb cd into the directory...
You can use scheme-less URLs (or protocol-relative URLs) to have browsers use the current protocol (HTTP or HTTPS) when loading content referenced with such an URL.
...relative URL doesn’t contain a protocol. For example, http://stevesouders.com/images/book-84x110.jpg becomes //stevesouders.com/images/book-84x110.jpg Browsers substitute the protocol of the page itself for the resource’s missing protocol. Problem solved...
Sometimes you want to see what data you get through a TCP or UDP connection. For example, you want to know how a HTTP Request look like.
...easy with netcat. Example to listen on port 80 and the output gets to stdout. sudo nc -kl 80 It's also possible write it into a file:
...run our end-to-end tests with headless Chrome. While it's a very stable solution overall, we sometimes see the headless Chrome process freeze (or the Capybara driver losing...
...connection, we're not sure). The effect is that your test suite suddenly stops progressing without an error. You will eventually see an error after a long timeout but until...
...nested projects. Then it's really helpful! This makes use of the CDPATH variable. Similar to the PATH variable, which holds the list of directories which are searched for executables...
Then add the following to your ~/.bashrc: export CDPATH=.:~/.bookmarks/ function mark { ln -sr "$(pwd)" ~/.bookmarks/"$1" } # Always resolve symbolic links (e.g. for bookmarks) alias cd="cd -P"
When using custom properties in your stylesheets, you may want to set a specific property value to an existing variable in your SASS environment. A pratical example would be a...
...existing quotes, you may use the meta.inspect() function: @use "sass:meta" $my-cool-font: "Roboto", sans-serif :root --font-family-sans-serif: #{meta.inspect($my-cool-font)} Unfortunately, the output of...
...will never return the current element itself, even if the element matches the given selector. Require the attached file and you can now say: $('.container').findWithSelf('.selector')
...take a long time, so we only want to compile when needed. This card shows what will cause Webpacker (the Rails/Webpack integration) to compile your assets. When you run a...
While development it is recommended to boot a webpack dev server using bin/webpack-dev-server. The dev server compiles once when booted. When you access your page on localhost before...
When you're getting this error, one possibility is that you've created a select field for an association instead of the associated object's id. Example: form.select :unit, Unit.for...
will be expected to deliver a real Unit object, whereas form.select :unit_id, Unit.for_select will make Rails typecast the String value from the select field to the unit...
You have to specify the environment with -e env_name or RAILS_ENV=env_name if you want to run a script on the server. at Rails 2 it's...
bundle exec script/runner -e env_name path/to/script.rb argument1 argument2 ... at Rails 3 it's rails runner RAILS_ENV=env_name bundle exec rails runner path/to/script.rb argument1 argument2...
Selenium cannot reliably control a browser when its window is not in focus, or when you accidentally interact with the browser frame. This will result in flickering tests, which are...
...tests to complete. The solution is to run Selenium inside a VNC session so the Selenium-controlled browser doesn't pop up over your main work area. Understanding issues with...
...but REST itself - in a nutshell. so here's a new angle i've started playing with: "REST Upside Down...
JavaScript engines such as Google’s V8 (Chrome, Node) are specifically designed for the fast execution of large JavaScript applications. As you develop, if you care about memory usage and...
...what’s going on in your user’s browser’s JavaScript engine behind the scenes...
The colors in Rails log files are helpful when watching them but, since they are ANSI color codes like ^[[4;36;1m, can be annoying when you are reading the...
...that does just prints those control characters (like less or vim). Remove them with sed: cat staging.log | sed -r "s/\x1B\[([0-9]{1,3}((;[0-9]{1,3})*)?)?[m...
Sometimes you want Angular to watch an object only until a certain state is reached (e.g. an object appears in the scope). Angular's $watch returns a method that you...
...can call to remove that watch. For example: unwatch = $scope.$watch 'user', (user) -> if user?
unwatch()
DevDocs combines multiple API documentations in a fast, organized, and searchable interface. Here's what you should know before you start: You don't have to use your mouse — see...
...the list of keyboard shortcuts The search supports fuzzy matching (e.g. "bgcp" brings up "background-clip") To search a specific documentation, type its name (or an abbreviation), then Tab
It's every developer's nightmare: SQL queries that get large and unwieldy. This can happen fairly quickly with the addition of multiple joins, a subquery and some complicated filtering...
...logic. I have personally seen queries grow to nearly one hundred lines long in both the financial services and health industries. Luckily Postgres provides two ways to encapsulate large queries...
...below if you are affected by the issue: The field's content "" did not match "some-text" (RSpec::Expectations::ExpectationNotMetError) Issue with headless Chrome After removing the line above in...
...it could happen that the tests are no longer running in headless mode. Updating the selenium-webdriver gem to >= 3.13.0 fixed the problem. Issue with old Capybaras
The linked article provides a good overview of the various concurrency primitives in Ruby, and what's changing in Ruby...
If your Webpack build is slow, you can use the Speed Measure Plugin for Webpack to figure out where time is being spent. Note that at time of writing, Webpack...
...now have an idea where optimization might be feasible. Look around for suggestions, e.g. the sass-loader readme when you want to optimize Sass build time...