...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...

...lot less than you think. "private" does not apply to class methods defined on self This does not make anything private: class Foo private def self.foo 'foo' end end

...need to use private_class_method instead: class Foo def self.foo 'foo' end private_class_method :foo end "private" does not apply to define_method This does not make anything...

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...

...to accept nested attributes for a record that is not an association, e.g.: class Site < ActiveRecord::Base def home_page @home_page ||= Page.find_by_name('home') end does 'accept_nested...

...attributes_for_member', :home_page end It has some limitations: Only works for singular member references ("belongs to"), not for a collection of references ("has many") No support for deletion...

...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...

Remember How to skip Sprockets asset compile during Capistrano deployment and Automatically skipping asset compilation when assets have not changed? Turns out there is an even better way to speed...

...up Capistrano deployments with asset compilation – and it's even simpler. Adding the asset cache directory to symlinked directories Popular asset managers for Rails are Sprockets and Webpacker. Both keep...

...exactly(building, other_building) expect(unit.assignable_buildings).not_to include(unauthorized_building, nil) end ... See RSpec: Where to put custom matchers and other support code

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...

When your JavaScript bundle is so massive that you cannot load it all up front, I would recommend to load...

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...

...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 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...

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...

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.

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...

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...

...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...

...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...