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This information originally found at:
http://www.reddit.com/r/rails/comments/2chtgw/tagging_in_rails_4/

Saving it here, in case it helps/is lost in the future.



Installation

    Gemfile

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before_filter do
  resource = controller_name.singularize.to_sym
  method = "#{resource}_params"
  params[resource] &&= send(method) if respond_to?(method, true)
end

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.off-canvas-fixed {
  -webkit-transition: -webkit-transform 500ms ease;
  transition: transform 500ms ease;
}

.move-right > .off-canvas-fixed {
  height: 100%;
  -webkit-transform: translate3d(15.625rem, 0, 0);
  transform: translate3d(15.625rem, 0, 0);
}

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# logic gates, via
# http://www.dzone.com/snippets/logic-gates-ruby

NAND = lambda { |i, j| !(i && j) }
NOT  = lambda { |i| NAND[i, i] }
AND  = lambda { |i, j| NOT[NAND[i, j]] }
OR   = lambda { |i, j| NAND[NAND[i, i], NAND[j, j]] }
NOR  = lambda { |i, j| NOT[OR[i, j]] }
XOR  = lambda { |i, j| NAND[NAND[i, NAND[i, j]], NAND[j, NAND[i, j]]] }
XNOR = lambda { |i, j| NOT[XOR[i, j]] }

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# config/initializers/logger_customizations.rb
# Production-only monkeypatches to make our logs awesome

# Monkeypatch 1
# Don't log common poller-style requests, they are just noise
class CustomLogger < Rails::Rack::Logger
  def initialize(app, opts = {})
    @app = app
    @opts = opts
    @opts[:silenced] ||= []

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In this article, I'll walk through a basic Rails (3.2.x) setup for creating a nested resource for two models. Nested resources work well when you want to build out URL structure between two related models, and still maintain a RESTful convention. This code assumes you are running RVM to manage Ruby/Gem versions, and Git for version control.

Creating a new Rails project

$ mkdir family # create rvm gemset 
$ echo "rvm use --create ruby-1.9.2@family" > family/.rvmrc 
$ cd family # install rails 
$ gem install rails # create new rails project 
$ rails new . # version control 

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# Original method

#def process(input)
#  if input == 'q'
#    puts 'Goodbye'
#  elsif input == 'tweet'
#    puts 'tweeting'
#  elsif input == 'dm'
#    puts 'direct messaging'
#  elsif input == 'help'

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1. Check if a page variable has been defined

   1. Set variables in a page (page.html.haml) at the very biginning of the file:

      ---
      variable: value
      variable2: value 2
      ---