Roger Luo rogerluo410

Initially install your pry-rails to group development on your apps Gemfile

group :development do
  # ..
  gem 'pry-rails'
  # ..
end

People

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Vue.js and Vuex - best practices for managing your state

Modyfing state object

Example

If you have to extend an existing object with additional property, always prefer Vue.set() over Object.assing() (or spread operator).

Example below explains implications for different implementations.

Docker - How to cleanup (unused) resources

Once in a while, you may need to cleanup resources (containers, volumes, images, networks) ...

delete volumes

// see: https://github.com/chadoe/docker-cleanup-volumes

$ docker volume rm $(docker volume ls -qf dangling=true)

$ docker volume ls -qf dangling=true | xargs -r docker volume rm

Opening and closing an SSH tunnel in a shell script the smart way

I recently had the following problem:

From an unattended shell script (called by Jenkins), run a command-line tool that accesses the MySQL database on another host.
That tool doesn't know that the database is on another host, plus the MySQL port on that host is firewalled and not accessible from other machines.

We didn't want to open the MySQL port to the network, but it's possible to SSH from the Jenkins machine to the MySQL machine. So, basically you would do something like

ssh -L 3306:localhost:3306 remotehost

	// everyone's new favorite closure pattern:
	(function(window,document,undefined){ ... })(this,this.document);

	// when minified:
	(function(w,d,u){ ... })(this,this.document);

	// which means all uses of window/document/undefined inside the closure
	// will be single-lettered, so big gains in minification.

	// it also will speed up scope chain traversal a tiny tiny little bit.

	# 1. Clear retry set

	Sidekiq::RetrySet.new.clear

	# 2. Clear scheduled jobs

	Sidekiq::ScheduledSet.new.clear

	# 3. Clear 'Processed' and 'Failed' jobs

	Explanation:
	```
	The reason behind this, is that in PostgreSQL (up to 9.3) there is no equality operator defined for json (i.e. val1::json = val2::json will always throw this exception) -- in 9.4 there will be one for the jsonb type.

	One workaround is, you can cast your json field to text. But that won't cover all json equalitions. f.ex. {"a":1,"b":2} should be equal to {"b":2,"a":1}, but won't be equal if casted to text.
	```

	Possible ways to fix:

	1) Migrate to Postgresql 9.4 and use .jsonb type

	# lib/tasks/db.rake
	namespace :db do

	desc "Dumps the database to db/APP_NAME.dump"
	task :dump => :environment do
	cmd = nil
	with_config do \|app, host, db, user\|
	cmd = "pg_dump --host #{host} --username #{user} --verbose --clean --no-owner --no-acl --format=c #{db} > #{Rails.root}/db/#{app}.dump"
	end
	puts cmd

	// Use Gists to store code you would like to remember later on
	console.log(window); // log the "window" object to the console