rich

create table categories (
  id          serial,
  parent_id   int4 references categories (id),
  name        varchar(100),
  primary key (id)
);

insert into categories (name) values ('one'), ('two'), ('three');

insert into categories (parent_id, name) values (1, 'cat'), (1, 'dog'), (1, 'bird'), (3, 'no'), (3, 'yes'), (3, 'maybe'), (8, 'good'), (8, 'bad'), (8, 'evil'), (4, 'diabetes'), (4, 'wilford brimley');

rich

fp = '/Users/rich/stocks.test.xml'

n = 5
Benchmark.bm(7) do |x|
 x.report("Hash.from_xml") do
   n.times do
     h = Hash.from_xml(open(fp).read)['stock_feed']
     h['sector'].map{|s| s['stock'].map {|i| i['name']}.first}.flatten
   end
 end

rich

require 'rubygems'
require 'nokogiri'
require 'activesupport'

class NokoHash
  def self.from_s(str)
    self.new(Nokogiri::XML(str))
  end

  def initialize(doc)

rich

select 
  d.id, 
  coalesce(f.cnt, 0) as cnt
from 
  departments as d left join 
  (select department_primary, count(1) as cnt from faculty group by department_primary) as f 
  on f.department_primary = d.id

rich

  def self.included(receiver)
    receiver.named_scope :latest_before, lambda {|time| {:conditions => ['created_at < ?', time]}}
  end

rich

class Link < ActiveRecord::Base
  acts_as_revisable
  belongs_to :post
end

rich

class Author < ActiveRecord::Base
  acts_as_revisable :on_delete => :revise
end

class AuthorRevision < ActiveRecord::Base
  acts_as_revision
end

@author = Author.create(:name => 'Rich')
@author.destroy

rich

Error during failsafe response: closed stream
[ pid=20176 file=Hooks.cpp:508 time=2009-04-03 10:00:56.78 ]:
  Backend process 9361 did not return a valid HTTP response. It returned: [Status]
*** Exception NoMethodError in application (undefined method `[]=' for nil:NilClass) (process 9361):
        from /opt/ruby-enterprise-1.8.6-20090201/lib/ruby/gems/1.8/gems/passenger-2.1.0/lib/phusion_passenger/rack/request_handler.rb:68:in `process_request'
        from /opt/ruby-enterprise-1.8.6-20090201/lib/ruby/gems/1.8/gems/passenger-2.1.0/lib/phusion_passenger/abstract_request_handler.rb:197:in `main_loop'
        from /opt/ruby-enterprise-1.8.6-20090201/lib/ruby/gems/1.8/gems/passenger-2.1.0/lib/phusion_passenger/railz/application_spawner.rb:340:in `start_request_handler'
        from /opt/ruby-enterprise-1.8.6-20090201/lib/ruby/gems/1.8/gems/passenger-2.1.0/lib/phusion_passenger/railz/application_spawner.rb:298:in `handle_spawn_application'
        from /opt/ruby-enterprise-1.8.6-20090201/lib/ruby/gems/1.8/gems/pa

rich

 ~/Projects/oss/serviceproxy (git::master) $ github pull --merge jeremydurham
/opt/local/lib/ruby/gems/1.8/gems/defunkt-github-0.3.4/bin/../lib/github/command.rb:57:in `exec': Operation not supported - git pull jeremydurham master (Errno::E045)
        from /opt/local/lib/ruby/gems/1.8/gems/defunkt-github-0.3.4/bin/../lib/github/command.rb:57:in `send'
        from /opt/local/lib/ruby/gems/1.8/gems/defunkt-github-0.3.4/bin/../lib/github/command.rb:57:in `run'
        from /opt/local/lib/ruby/gems/1.8/gems/defunkt-github-0.3.4/bin/../lib/github/command.rb:45:in `git_exec'
        from /opt/local/lib/ruby/gems/1.8/gems/defunkt-github-0.3.4/lib/commands/commands.rb:109:in `command'
        from /opt/local/lib/ruby/gems/1.8/gems/defunkt-github-0.3.4/bin/../lib/github/command.rb:25:in `send'
        from /opt/local/lib/ruby/gems/1.8/gems/defunkt-github-0.3.4/bin/../lib/github/command.rb:25:in `call'
        from /opt/local/lib/ruby/gems/1.8/gems/defunkt-github-0.3.4/bin/../lib/github.rb:74:in `invoke'
   

rich

class Author < ActiveRecord::Base
  has_many :books do
    def correct
      map {|b| b.name}
    end
    
    def broken
      proxy_target.map {|b| b.name}
    end
  end