begin29

# put variable to alias
#put it out of quote
!sh -c 'git rebase -i HEAD~'$1''

begin29

#If we have following code in model:

composed_of :temperature, :mapping => %w(celsius)

#Then our composition class can be this:

class Temperature
  def initialize(celsius)
    @celsius = celsius
  end

begin29

render "shared/header", { :headline => "Welcome", :person => person }

# shared/header
<% if local_assigns.has_key? :headline %>
  Headline: <%= headline %>
<% end %>

begin29

# for with index
for value, index in list
  console.log value, index
  
#jQuery each
$.each data, (i, line) ->

begin29

# check if column exist
ActiveRecord::Base.connection.column_exists?(:table_name, :column_name)

begin29

# it looks to `schema_migrations` table and check what migrations was already run

# after merge your code with migration if your migration has name e.g. 2015000000
# and it used some old column name that already renamed in new migrations, this 
# migration will crash

# file: 2015000000_old_migration
class OldMigration < ActiveRecord::Migration
  def up
    # trow Error, that column car_id doesn't exist

begin29

h2[id="tagline"
   class="small tagline"] = page_tagline

begin29

# :includes delegates to :eager_loading or :preload
# :eager_loading - one big query
# :preload - few small queries


# get only polish adresses then preload all 
User.joins(:addresses).where("addresses.country = ?", "Poland").preload(:addresses)
# SELECT "users".* FROM "users"
# INNER JOIN "addresses" ON "addresses"."user_id" = "users"."id"
# WHERE (addresses.country = 'Poland')

begin29

# check if variables is set
if [[ $1 ]]; then
  echo 'variable is set!'
else
  echo 'ERROR: variable is not set!'
fi

begin29

mkdir /ftpmount
# first install curlftpfs if it doesn't exist
curlftpfs -o allow_other user_name:password@ftpserver /ftpmount

# mount it permanently
# go to /etc/fstab and add command above
# it will be added automatically

# umount
umount /ftpmount