andhapp

[james@kremlin00 ruby (klasscache)]$./ruby  -I . -I lib ./test.rb 
method cache invalidations: 18
A
B
method cache invalidations: 18

andhapp

Instrument Anything in Rails 3

With Rails 3.0 released a few weeks ago I've migrated a few apps and I'm constantly finding useful new improvements. One such improvement is the ability to log anything in the same way that Rails internally logs ActiveRecord and ActionView. By default Rails 3 logs look slightly spiffier than those produced by Rails 2.3: (notice the second line has been cleaned up)

Started GET "/" for 127.0.0.1 at Mon Sep 06 01:07:11 -0400 2010
  Processing by HomeController#index as HTML
  User Load (0.2ms)  SELECT `users`.* FROM `users` WHERE (`users`.`id` = 3) LIMIT 1
  CACHE (0.0ms)  SELECT `users`.* FROM `users` WHERE (`users`.`id` = 3) LIMIT 1

Rendered layouts/_nav.html.erb (363.4ms)

andhapp

data:text/html, <style type="text/css">#e{position:absolute;top:0;right:0;bottom:0;left:0;}</style><div id="e"></div><script src="http://d1n0x3qji82z53.cloudfront.net/src-min-noconflict/ace.js" type="text/javascript" charset="utf-8"></script><script>var e=ace.edit("e");e.setTheme("ace/theme/monokai");e.getSession().setMode("ace/mode/ruby");</script>

andhapp

Researchers investigating the Rails parameter parsing vulnerability discovered that the same or similar vulnerable code had made its way into multiple other libraries. If your application uses these libraries to process untrusted data, it may still be vulnerable even if you have upgraded Rails. Check your Gemfile and Gemfile.lock for vulnerable versions of the following libraries.

Directly vulnerable libraries

rails

Vulnerable: <= 3.2.10, <= 3.1.9, <= 3.0.18, <= 2.3.14

Fixed: 3.2.11, 3.1.10, 3.0.19, 2.3.15

multi_xml

andhapp

Locate the section for your github remote in the .git/config file. It looks like this:

[remote "origin"]
	fetch = +refs/heads/*:refs/remotes/origin/*
	url = git@github.com:joyent/node.git

Now add the line fetch = +refs/pull/*/head:refs/remotes/origin/pr/* to this section. Obviously, change the github url to match your project's URL. It ends up looking like this:

andhapp

  $ cd /usr/src
  $ wget http://nginx.org/download/nginx-0.8.52.tar.gz
  $ tar xzvf ./nginx-0.8.52.tar.gz
  $ rm ./nginx-0.8.52.tar.gz

  $ gem install s3sync capistrano capistrano-ext passenger --no-ri --no-rdoc
  $ passenger-install-nginx-module
  # Automatically download and install Nginx?           2. No: I want to customize my Nginx installation
  # Where is your Nginx source code located?:           /usr/src/nginx-0.8.52
  # Where do you want to install Nginx to?:             /opt/nginx

andhapp

Rails Mime::Type.parse Patches

There are two Rails issues in it's handling of the HTTP Accept header which cause a number of spurious exception emails via Airbrake. I am encountering this on Rails 3.0.7. One of these is fixed in a later version of Rails, but for other reasons I can't upgrade right now. The other bug is still present in Rails 3.2 and in master at the time of this writing. This gist includes some monkey patches you can apply to fix these issues until such time that they are fixed in Rails properly.

Rails Issue #736

Issue #736 is that Rails does not correctly parse a q-value in an Accept header when there is only one content-type specified. For example:

Accept: text/html;q=0.9

andhapp

# Gemfile

source "http://rubygems.org"

gem 'mechanize'
gem 'hpricot'


# Ruby code

andhapp

  desc "precompile the assets"
  task :precompile_assets, :roles => :web, :except => { :no_release => true } do
    run "cd #{current_path}; rm -rf public/assets/*"
    run "cd #{current_path}; RAILS_ENV=production bundle exec rake assets:precompile"
  end

andhapp

class ActiveRecord::Base
  def can_destroy?
    self.class.reflect_on_all_associations.all? do |assoc|
      assoc.options[:dependent] != :restrict || (assoc.macro == :has_one && self.send(assoc.name).nil?) || (assoc.macro == :has_many && self.send(assoc.name).empty?)
    end
  end
end