If you are using scrum in a project you might be familiar with planning poker, a playful way to agree on story estimates. PoinZ is an online planning poker app...

You can use three different versions of the regular expression syntax in grep: basic: -G extended: -E(POSIX) perl: -P (PCRE) Difference between basic and extended: In basic regular expressions...

...the meta-characters '?', '+', '{', '|', '(', and ')' loose their special meaning; instead use the backslashed versions '?', '+', '{', '|', '(', and ')'. Difference between extended (POSIX) and perl (PCRE): E.g. \d is not supported in POSIX.

...you can install the official Java JRE: sudo apt-get update sudo apt-get install sun-java6-jre You can now check your default JVM with java -version. It should...

...versions below 10.10. If it does, please update this note. sudo add-apt-repository ppa:sun-java-community-team/sun-java6 You probably want to get rid of OpenJDK (which is...

...alias such as this to your ~/.bashrc: alias recent-branch="git for-each-ref --sort=-committerdate --format='%(refname:short)' refs/heads/ | fzf | sed 's/\* //g' | xargs -I '{}' git checkout {}"

Now whenever you want to switch back and forth between your most recent branches, type recent-branch, select one and press enter...

If you have an html_safe string, you won't be able to call gsub with a block and match reference variables like $1. They will be nil inside the...

...with rails_xss) as well as Rails 3 applications. Here is a fix to SafeBuffer#gsub. Note that it will only fix the $1 behavior, not give you a safe...

The need for clearfix hacks has been greatly reduced since we could layout with Flexbox or CSS Grid. However, when you do need a clearfix, there's no reason to...

...hack anymore. You can just give the clearing container display: flow-root. This is supported by all browsers except IE11...

...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...

RubyMine offers you to exclude directories from search, meaning faster search results and less "noise" in the list of result. Right-click a folder in your project tree and click...

...and other directories that you don't need to access during development and whose search results are irrelevant. They won't be deleted but simply ignored when searching across a...

...check checkboxes. But there's one problem, if you want to test a custom styled checkbox, which hides its -Tag: The methods cannot (un)check checkboxes without an visible .

...error message will be something like: Unable to find visible checkbox "Some label" that is not disabled Solution 1 Use the keyword argument allow_label_click: true within the method...

Sometimes, the rails dev server doesn't terminate properly. This can for example happen when the dev server runs in a RubyMine terminal. When this happens, the old dev server...

...blocks port 3000, so when you try to start a new server, you get the error: Address already in use - bind(2) for "127.0.0.1" port 3000 (Errno::EADDRINUSE)

...filled out at the same time, there is no built-in validation. I've seen different solutions in the wild, each with different downsides: Private method referenced via validate: works...

...name, :nickname, xor_presence: true end Validator Here is the validator class; put it somewhere in your project. class XorPresenceValidator < ActiveModel::Validator def initialize(options) @attributes = Array.wrap(options[:attributes]).freeze...

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 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 to create maps within SASS/SCSS-files, it normally works like this: $some-map: (key1: value1, key2: value2) However, some maps can get big really fast, if they...

...since 2011 and it hasn't been resolved since then. Writing a map likes this: $some-map: ( key1: value1, key2: value2 ) confuses the SASS-parser and you will get an...

...is pretty useful, but manipulating values of arrays can be awkward because of its syntax. Consider the following users table which each example below will start from: name topics

Bob {llamas} (PostgreSQL uses curly braces to represent arrays, true story.) Adding values Use the array_cat function, or the || operator. These calls will add the values "cats...

Sometimes it is useful to define a named scope by implementing a static method with the scope's name on the scoped class. For instance, when a method should decide...

...which existing scope should be the next link in the scope chain. Take this class for example: class Meal < ActiveRecord::Base named_scope :for_date, lambda { |date| :conditions => { :date => date...

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...

SVG files are often much larger than necessary, containing comments, metadata, hidden elements etc. Optimize them with this tool. Web UI: https://jakearchibald.github.io/svgomg/ Binary: https://github.com/svg/svgo

...for a properly scaling SVG, you need to keep the viewBox attribute. There's an option --disable=removeViewBox for this...

When using the asset pipeline your assets (images, javascripts, stylesheets, fonts) live in folders inside app: app/assets/fonts app/assets/images app/assets/javascripts app/assets/stylesheets With the asset pipeline, you can use the...

When you deploy, Rails runs assets:precompile which precompiles all assets into static files that live in public/assets. This way you have all the performance of static files...

Ruby's standard library includes a class for creating temporary directories. Similar to Tempfile it creates a unique directory name. Note: You need to use a block or take care...

...of the cleanup manually You can create a prefix and suffix e.g. Dir.mktmpdir(['foo', 'bar']) => /tmp/foo20220912-14561-3g93n1bar You can choose a different base directory than Dir.tmpdir e.g. Dir.mktmpdir('foo', Rails.root.join('tmp...

ActiveRecord provides the ids method to pluck ids from a scope, but what if you need to pluck Global IDs? While you could just call map(&:to_global_id) on...

...your scope, this approach would instantiate each record just to do that. When you have many records, this will at the very least be slow. Here is a method that...

ActiveRecord offers an explain method similar to using EXPLAIN SQL statements on the database. However, this approach will explain all queries for the given scope which may include joins or...

Output will resemble your database's EXPLAIN style. For example, it looks like this on MySQL: User.where(id: 1).includes(:articles).explain EXPLAIN for: SELECT `users`.* FROM `users`  WHERE...