amatsuda

function! s:RunRspec (opts)
  let rails_spec_path_re = '\<spec/\(models\|controllers\|views\|helpers\)/.*_spec\.rb$'

  if( expand('%') =~ rails_spec_path_re && filereadable('script/spec') )
    "let command = '!ruby script/spec '
    let spec_command = '!rspec '
    if filereadable('tmp/pids/spec_server.pid')
      let spec_command = spec_command . ' --drb '
    endif
  else

amatsuda

products = Product.where("price = 100").limit(5) # No query executed yet
products = products.order("created_at DESC")     # Adding to the query, still no execution
products.each { |product| puts product.price }   # That's when the SQL query is actually fired

class Product < ActiveRecord::Base
  scope :pricey, where("price > 100")
  scope :latest, order("created_at DESC").limit(10)
end