maxim

- name: ensure github.com is a known host
  lineinfile:
    dest: /root/.ssh/known_hosts
    create: yes
    state: present
    line: "{{ lookup('pipe', 'ssh-keyscan -t rsa github.com') }}"
    regexp: "^github\\.com"

maxim

In Rails 3

NOTE: This post now lives (and kept up to date) on my blog: http://hakunin.com/rails3-load-paths

If you add a dir directly under app/

Do nothing. All files in this dir are eager loaded in production and lazy loaded in development by default.

If you add a dir under app/something/

maxim

Excellent high quality karaoke setup for under $1000

For my Vietnamese wife a good karaoke setup is serious business. Problem is, I noticed that some people spend thousands of dollars on unnecessary stuff like gigantic receivers and speakers, only to end up with hiss, clipping, and clunky operation. Smart/consistent home setup should definitely fit under $1000, and that's with speakers and expensive Nvidia Shield box. You could definitely cut it to under $500 and still have a great setup. I did some research and put together a convenient setup for amazing quality at-home karaoke that isn't worth thousands, isn't a chore to operate, and passes Asian quality standards with flying colors.

How to use this setup once it's ready:

1. You find any song on your phone's Youtube and cast it to your TV
2. You pick up the microphone, start singing, and it all just sounds surprisingly beautiful

This guide assumes that you already have a TV with HDMI ARC or Optical/Coaxial audio output, and that you have WiFi at home.

maxim

def has_role?(role, object)
  if object.has_association?(role)
    if has_many?
      object.roles.find(self.id)
    else
      object.role.id == self.id
    end
  else
    self.roles.include?(role)
  end

maxim

defmodule EctoBatchStream do
  import Ecto.Query, only: [from: 1, from: 2]

  @batch_size 1000

  # Example:
  #
  #     query = from u in MyApp.User, select: u.email
  #     stream = EctoBatchStream.stream(MyApp.Repo, query)
  #     stream |> Stream.take(3) |> Enum.to_list # => […]

maxim

def authorize_key_for_root(config, *key_paths)
  [*key_paths, nil].each do |key_path|
    if key_path.nil?
      fail "Public key not found at following paths: #{key_paths.join(', ')}"
    end

    full_key_path = File.expand_path(key_path)

    if File.exists?(full_key_path)
      config.vm.provision 'file',

maxim

# config/initializers/react.rb

Rails.configuration.react.server_renderer =
  Class.new(React::ServerRendering::BundleRenderer) do
    private

    def render_from_parts(before, main, after)
      js_code = compose_js(before, main, after)
      @context.eval(js_code)
    end

maxim

- name: ensure postgresql hstore extension is created
  sudo: yes
  sudo_user: postgres
  shell: "psql {{ postgresql_database }} -c 'CREATE EXTENSION hstore;'"
  register: psql_result
  failed_when: >
    psql_result.rc != 0 and ("already exists" not in psql_result.stderr)
  changed_when: "psql_result.rc == 0"

maxim

def plain_text_receipt # => Runtime: 5 sec, Network Timeout
  <<-TEXT
  Thank you for your order!
    Product: #{name} - #{price} # => 2 DB queries
    Tax:     #{tax_amount}      # => 1 DB query, 1 API call
    Total:   #{total_amount}    # => 2 DB queries, 1 API call
  TEXT
end

private

maxim

# Rake tasks for managing git plugins with submodules.
#
# These tasks aim to make life simpler by automating all the boring work.
# What you get:
#   - complete git integration (all you need to know is install, uninstall and update)
#   - complete github integration (only use author name + plugin name)
#   - rails plugin hooks (install.rb/uninstall.rb) are taken care of 
#
# Available commands:
#