rails

rails idiom.rb

the Hash Rocket syntax (:foo => "bar")
is deprecated in favor of the new-to-Ruby JSON-style hash (foo: "bar")

run inside project
rvm use 1.9.3-p327@rails3 --rvmrc

rails new APP -T 
rails generate controller Users new --no-test-framework
rails generate model User name:string email:string --no-test-framework
rails _3.2.13_ new demo #when the sytem has rails 4 but you want rails 3.2
rails _4.2_ new demo #when the sytem has rails 5 but you want rails 4
rails _5.x.x_ new demo #when the sytem has rails 4 but you want rails 5



git push -u origin BRANCHNAME

rake db:drop
rake db:create
rake db:migrate
rake db:seed

rollback bootstrap (or other format)
rake assets:clean

$ rails new rails-bootstrap -m https://raw.github.com/RailsApps/rails-composer/master/composer.rb

heroku run rake database:add_new_transaction RAILS_ENV=production --app vertotrack

#how to acheive blocks in red and green with a status boolean field
<style>
span.status {display; block; width; 10px; height; 10px; 
	margin; 0.25em auto; padding; 0; border; 1px splid #000000; }
span.status.true  {background: green; color: green; }
span.status.false {background: red; color: red; }
</style>


for use in production, sends error as an email
Exception_notification gem

git rm -r --cached .
git add .
git commit -m ".gitignore is now working"

time is ticking away
time = Time.now # => Thu Jan 18 06:10:17 CST 2007 
time.to_formatted_s(:time) # => "06:10" 
time.to_s(:time) # => "06:10"
time.to_formatted_s(:db) # => "2007-01-18 06:10:17"
time.to_formatted_s(:number) # => "20070118061017" 
time.to_formatted_s(:short) # => "18 Jan 06:10"
time.to_formatted_s(:long) # => "January 18, 2007 06:10" 
time.to_formatted_s(:long_ordinal) # => "January 18th, 2007 06:10" 
time.to_formatted_s(:rfc822) # => "Thu, 18 Jan 2007 06:10:17 -0600"

##instance variable 
class Item
  def initialize(item_name, quantity)
    @item_name = item_name
    @quantity = quantity   
  end
  
  def front
    @front
  end 
  #IS THE SAME AS 
  attr_reader :front
  
    def front = front
    @front = front
  end 
  #IS THE SAME AS 
  attr_writer :front   (put at top ) 
  
  attr_accessor is same as attr_writer, attr_reader 
  
  
  
####SYMBOL
module One
  class Fred
  end
  $f1 = :Fred
end
module Two
  Fred = 1
  $f2 = :Fred
end
def Fred()
end
$f3 = :Fred
$f1.object_id   #=> 2514190
$f2.object_id   #=> 2514190
$f3.object_id   #=> 2514190

! bang method shuffle(temp) shuffle! permanant chagne
! bang method make permanate modifier 

@cards.each(&:play)
wrap in a method 
method Flashcards
   class Cards
     
    call like Flashcards::Cards.new 
avoid name collisions