International

rabbitmqctl add_user test test
rabbitmqctl set_user_tags test administrator
rabbitmqctl set_permissions -p / test ".*" ".*" ".*"

International

1. Change rails version in Gemfile
> gem 'rails', '~> 5.1', '>= 5.1.4'

2. Remove Gemfile.lock
> git rm Gemfile.lock

3. Run bundle install command
> bundle install --jobs=5

4. Run rails' app update to apply changes to app

International

require 'cucumber'
require 'selenium-webdriver'
# require 'cukehub' # optional, but recommended. See cukehub.com for more details

caps = Selenium::WebDriver::Remote::Capabilities.chrome(chromeOptions: { binary: "/Applications/Google\ Chrome\ Canary.app/Contents/MacOS/Google\ Chrome\ Canary", 
                                                                         args: [ "--headless" ]})

Before do
  @browser = Selenium::WebDriver.for :chrome, desired_capabilities: caps
end

International

require 'cucumber'
require 'selenium-webdriver'
# require 'cukehub' # optional, but recommended. See cukehub.com for more details

caps = Selenium::WebDriver::Remote::Capabilities.chrome(chromeOptions: { binary: "/Applications/Google\ Chrome\ Canary.app/Contents/MacOS/Google\ Chrome\ Canary", 
                                                                         args: [ "--headless" ]})

Before do
  @browser = Selenium::WebDriver.for :chrome, desired_capabilities: caps
end

International

# config/initializer/delayed_job.rb

module Delayed
  module Plugins
    class Flaming < Plugin
      callbacks do |lifecycle|
        lifecycle.around(:invoke_job) do |job, *args, &block|
          HelperMethods.flaming(name: "DELAYEDJOB--#{job.name}") do
            block.call(job, *args)
          end

International

// An intersting pattern for testing, but you can use the check anywhere
import "testing"

func TestCheckingChannel(t *testing.T) {
  stop := make(chan bool)

  // Testing some fucntion that SHOULD close the channel
  func (stop chan bool) {
    close(chan)
  }(stop)

International

Steps to install and run PostgreSQL 9.2 using Homebrew (Mac OS X)
(if you aren't using version 9.1.5, change line 6 with the correct version)

1. launchctl unload -w ~/Library/LaunchAgents/homebrew.mxcl.postgresql.plist
2. mv /usr/local/var/postgres /usr/local/var/postgres91
3. brew update
4. brew upgrade postgresql
5. initdb /usr/local/var/postgres -E utf8
6. pg_upgrade -b /usr/local/Cellar/postgresql/9.1.5/bin -B /usr/local/Cellar/postgresql/9.2.0/bin -d /usr/local/var/postgres91 -D /usr/local/var/postgres
7. cp /usr/local/Cellar/postgresql/9.2.0/homebrew.mxcl.postgresql.plist ~/Library/LaunchAgents/

International

Understanding HTTP’s Transfer-Encoding: chunked

Simply put, Transfer-Encoding: chunked, in a HTTP response header, tells us the body will be received in several chunks.

This is ideal in 2 scenarios:

1. When the size of the body isn’t known in advance, like when generating output from a database.
2. When the size of the body is too big to be fully loaded in RAM before being sent to the client.

In practice, the body has each of its chunks separated with X\r\n, where X is the size of the chunk in hexadecimal. For instance:

International

# Add mixin to /config/initializers/
module LogQuerySource
  def debug(*args, &block)
    return unless super

    backtrace = Rails.backtrace_cleaner.clean caller

    relevant_caller_line = backtrace.detect do |caller_line|
      !caller_line.include?('/initializers/')
    end

International

defmodule Loop do
  defmacro while(predicate, do: block) do
    quote do
      try do
        for _ <- Stream.cycle([:ok]) do
          if unquote(predicate) do
            unquote(block)
          else
            throw :break
          end