Active Record's select method allows you to make use of the power of MySQL select statements. On the one hand it allows you to select specific fields.

Post.select("content")

results in the following query:

"SELECT content FROM `posts`"

This means that your models will be initialized with only the content attribute and you will not be able to access any other attribute. In fact trying so would raise an ActiveRecord::MissingAttributeError error.

 Post.select("content").first.title # => ActiveRecord::MissingAttributeErr...

Here is a good explanation for zombie processes.

Quote:

If you have zombie processes it means those zombies have not been waited for by their parent (look at PPID displayed by ps -l). 
You have three choices: Fix the parent process (make it wait); kill the parent; or live with it.
Remember that living with it is not so hard because zombies take up little more than one extra line in the output of ps.

On a server I want to get informed if there are zombie processes and track them wi...

Backbone plugin to override getters and setters with logic.

ActionMailer per default uses http as protocol, which enables SSL-stripping. When a logged-in user follows an http link to your application, it sends the cookies along with it. Although the application redirects the user to https and from that point has a secure connection to the user, an attacker may overhear that first unsafe request and hijack your session.

Teach ActionMailer to use the right protocol

If your application is behind SSL, turn on using https application-wide. In your environment file (either global or per environ...

In order to have more human readable git branches, do

  git pull --rebase

To always pull like this, write these lines to your ~/.gitconfig:

[pull]
   rebase = true

..or use this oneliner

git config --global pull.rebase true

Note that this will break if you pull from other upstream branches like

git pull origin other-branch

If you keep rebasing by default, you can get "merge pulls" like this:

git pull --no-rebase origin other-branch

Put the attached files into your home directory and enjoy.

.irbrc

• defines interesting_methods, which is essentially all methods without top-level methods inherited from Object/Module
• requires awesome_print, if present
• requires interactive_editor, if present (basically makes vim available)
• loads .irbrc_rails if in Rails (e.g. for the Rails console)

.irbrc_rails

• defines efind(email), which is a shortcut to find users by email
  ...

TLDR

Do it like this:

attribute :active, Virtus::Attribute::Boolean

Long story

In Virtus you define attribute with their type like this:

attribute :name, String
attribute :birthday, Date

When defining a boolean attributes, you will probably write it like this:

attribute :active, Boolean

The problem is, there is not actually a Boolean class in Ruby (there's only TrueClass and FalseClass), so use Virtus::Attribute::Boolean instead.

The reason whil...

Capistrano recently had some API changes that can results in deploys not working when running with old deploy.rb files.

So let's bundle it. Put capistrano into your Gemfile, like this:

# Gemfile

group :deploy do
  gem 'capistrano'
  gem 'capistrano_colors'
end

It's possible you need to do a bundle update net-ssh to get things running.

Now double check that all your custom hooks are actually still called. One candidate might be an after deploy:symlink hook that has been renamed into `after deploy:creat...

Sometimes sound breaks for me and speaker output is completely broken. This helped:

pulseaudio -k && sudo alsa force-reload

Essential backports that enable many of the nice features of Ruby 1.8.7 up to 2.0.0 for earlier versions.

The Ruby on Rails security list archive can be found here: http://groups.google.com/group/rubyonrails-security

You can subscribe to this mailing list without a Google account by pasting this URL into your browser (after replacing the email address obviously).

http://groups.google.com/group/rubyonrails-security/boxsubscribe?email=your.name@example.com
                                                                       ^^^^^^^^^^^^^^^^^^^^^ <- Change this

Our development process makes us deploy very often. As the number of releases grows, junk clogs up the hard drive of our application servers:

• Old release code
• Old tmp folders with compiled view templates etc.
• Precompiled assets (Javascripts, images...) that no longer exist. When using the asset pipeline, Capistrano will symlink the public/assets directory to shared/assets. This is cool since we can still serve previous assets after a new release, in the window where browser caches might still have references to old assets. But i...

Good article that tells you how to change behavior of certain keys via xmodmap (with the help of exv if you need to find out the keycode).

New WYSIWYG editor that claims to be lighter and prettier than TinyMCE and CKEditor. Has some Rails integration, too.

No chance you would have ever guessed it...

sudo palimpsest

As Bill Dueber has on his blog, you can call rvm in the shebang to select a Ruby version like this:

 #!/usr/bin/env rvm 1.9 do ruby

Standard arguments to do apply, see $> rvm help do.

Back in the old days, we couldn't do something like that:

.foo {
  position: absolute;
  bottom: 0;
  /* This was bad: */
  left: 10px;
  right: 10px;
}

Why? Because IE5 and IE6 (which a majority of people used back then) failed horribly trying to render it.

I've now checked if this is still an issue with any browser that's not from the stone age. \
Turns out all is well -- except if you have to support IE6 and below, but then you're in some other kinds of trouble.

It works in all sane browsers, and Internet Explorer 7, 8...

Capybara drivers will usually delete all cookies after each scenario. If you need to lose cookie data in the middle of a scenario, you can do this:

browser = Capybara.current_session.driver.browser
if browser.respond_to?(:clear_cookies)
  # Rack::MockSession
  browser.clear_cookies
elsif browser.respond_to?(:manage) and browser.manage.respond_to?(:delete_all_cookies)
  # Selenium::WebDriver
  browser.manage.delete_all_cookies
else
  raise "Don't know how to clear cookies. Weird driver?"
end

If you want a widget for awesome that runs a command regularly (every X seconds) and puts the output into your awesome panel, this is for you.

Put the code below into your ~/.config/awesome/rc.lua. It supplies two methods:

• execute_command will run a command and return its output. Multiple lines will be joined into one line. The code is from the awesome wiki.
• widget_with_timeout is a method that takes a command to run and a timeout in secon...

To reset the position of split dividers, drag all the dividers out of the screen. Then turn off splitting and turn it on again.

You have multiple options:

1. Just don't have a type column. All STI magic will be disabled automatically.
2. If you have a type column but want to use it for something else (WAT?), you can set self.inheritance_column = :_non_existing_column in the class definition
3. (Untested) In the parent class, set self.abstract_class = true

This technique is useful to implement form models / presenters, where you want all the goodness of Ac...

In order to clone a git repository including all branches and tags you need to use two parameters when cloning the old and pushing to the new repository respectively:

git clone --bare http://example.com/old-repo.git
cd old-repo
git push --mirror http://example.com/new-repo.git

Of course, the URLs to your repository might look different depending on the protocol used, username required, etc.
For a user git using the git protocol, it could be git@example.com:repository-namespace/repository.git