By default, Opera 11 hides any passed params and the URL's protocol until you focus the address bar.

To disable hiding URL parameters, open up Tools → Preferences (Ctrl+F12) → Advanced → Browsing and check "Show full web address in address field". No need to touch opera:config.

The badge that displays the page's "zone" (Web, Secure, Opera, ...) will be shrinked so you can still see a yellow lock for proper SSL connections, etc.

It is common in Rails 3.0 applications that you want to provide default views for a group of controllers. Let’s say you have a bunch of controllers inside the Admin namespace and you would like each action to fallback to a default template. So if you are rendering the index action for Admin::PostsController and “app/views/admin/posts/index.html.*” is not available, it should then render “app/views/admin/defaults/index.html”.

Since Rails 3.0, we have a new abstraction called resolvers that holds the logic to find a template.

If you want to manually check if e-mail delivery works on a machine by sending an e-mail you can run the following:
mail -s Test someone@example.com < /dev/null

This will send an empty e-mail with "Test" as its subject to someone@example.com.

If you want it to contain a message body, call mail -s Test someone@example.com only; the mail application will then read your input from stdin. Finish your message by sending EOT with Ctrl-D -- if you are asked for anything else ...

Note: ActiveRecord::Base#becomes has a lot of quirks and inconsistent behavior. You probably want to use ActiveType.cast instead.

ActiveRecord models have with a method becomes(klass) which you can use to cast the record into an instance of its subclasses or superclass. This is useful because some parts of Rails reflect on the class of an instance, e....

Artifice allows you to replace the Net::HTTP subsystem of Ruby with an equivalent that routes all requests to a Rack application.

You can use Sinatra, raw Rack, or even Rails as your application, allowing you to build up an equivalent to the remote service you are mocking out using familiar and convenient tools to route requests and build up responses.

mitmproxy is an SSL-capable, intercepting HTTP proxy. It provides a console interface that allows traffic flows to be inspected and edited on the fly.

There is a nasty bug in all version of Rails 2 and some versions of Rails 3.x where two chained scopes with hash conditions on the same attribute would overwrite each other.

This is a horrible security issue if you are using scopes to limit what a user may see or change.

Workaround

If you are using an affected Rails version and cannot switch to a fixed version, you can use this manual workaround....

If there is some weird margin at the top of your page for no apparent reason, chances are one of your views contains a BOM (Byte Order Mark).

To remove it, open the file with VIM, and type
:set nobomb
:wq

Bryan talked about the differences between imperative and declarative scenarios. In my opinion, both styles have benefits and should be used appropriately based on the situation. The majority of examples on rspec's story runner currently on the web, including mine, are of the imperative type. Since the declarative type has many advantages I thought it would be worth while to present some examples and contrast the differences between the two styles.

Google’s Font Directory and API for web fonts could have a transformative effect on how we read the web. The only problem is, Google has made it very difficult to download all of the actual font files.

Web designers must be free to experiment with these new fonts, to sketch, comp and get to know these typefaces in browser and non-browser applications. This is why I’m providing this archive.

To test whether a hash includes an expected sub-hash:

expect(user.attributes).to match(hash_including('name' => 'Bruce Wayne'))
expect(User).to receive(:create!).with(hash_including('name' => 'Bruce Wayne'))

At times, it might be unavoidable to have different CSS rules for Internet Explorer than for sane browsers. Using Sass, this can be achieved in a relatively non-hackish way without CSS hacks.

Step 1

Move your current Sass file into a partial. Let's assume it was called screen.sass. Rename it _screen.sass.

Step 2

Create two new Sass files:

Call this one screen.sass:
$ie = false
@import screen

Call this one screen_for_ie.sass:
$ie = true
@import screen

Step 3

Change y...

When using ActionMailer, you can set an array of email addresses as recipients. If this array is generated by e.g. collecting email addresses from the database, it might sometimes be empty.

To prevent ActionMailer to deliver mails to nobody, simply overwrite the deliver! method like this:

# In your mailer.rb
def deliver!(mail = @mail)
  return false if (recipients.nil? || recipients.empty?) && (cc.nil? || cc.empty?) && (bcc.nil? || bcc.empty?)
  super
end

The Ubuntu Documentation on LaTeX says, that the packages tetex are no longer supported. You can install the alternative texlive (380 MB) via apt-get.

sudo apt-get install texlive

Phillip Koebbe from Ruby on Rails suggested inserting following code between the "bootstrap" and "initialize" sections of enviroment.rb. This hack fixes the problem.

if Gem::VERSION >= "1.3.6"
  module Rails
    class GemDependency
      def requirement
        r = super
        (r == Gem::Requirement.default) ? nil : r
      end
    end
  end
end

Back when Steak was first released, Capybara didn’t have any of the nice RSpec helpers it does now. A lot has changed since. Besides the helpers, it got its own RSpec acceptance testing DSL recently, essentially eating Steak’s functionality and turning it into a complete acceptance testing solution (on top of RSpec).

Liquid Canvas is a JavaScript library which allows you to draw inside an HTML canvas element with an easy yet powerful description language.

It can be used to add graphics to your web page without ever touching an image creation tool such as The Gimp, Inkscape or Photoshop.

Check out the Demo and the basic example and then download version 0.3.

If you just upgraded to Bundler 10.0.10 you might get the following error when bringing up Rails:

/usr/lib/ruby/1.9.1/psych.rb:148:in `parse': couldn't parse YAML at line 17 column 14 (Psych::SyntaxError)

This is caused by Rails localization files (en.yml, de.yml, etc.) using symbols for various translation strings, and Bundler 10.0.10 defaults to a new YAML engine which cannot handle symbols.

You can switch back to the old YAML engine by ...

Note that you cannot currently use Ruby 1.9.2 with Rails 2 applications that use RSpec, so don't upgrade if that is your setup. The rspec-rails gem has a fatal bug that was only fixed for rspec-rails-2.x, which only supports Rails 3. There is no fix for the rspec-rails-1.3.x series of the gem which supports Rails 2.

Anyway, here are upgrade instructions if you only work with Rails 3 or don't use RSpec. You will lose all your gems in the process, but you can get them back easily if you h...

PhantomJS is a minimalistic headless WebKit.

It has fast and native support for various web standards:

DOM handling, CSS selector, JSON, Canvas, and SVG.

PhantomJS can be fully scripted using JavaScript. It is an optimal solution for headless testing of web-based applications, site scraping, pages capture, SVG renderer, PDF converter and many other usages.

Sometimes you can make your life easier by not allowing a record attribute to be changed after the record was created. An example for this is when your model represents a child node in a composition and has logic that is hard to support for cases when the container changes.

Here is an example for a container Region composed of many children of type Holiday. After saving a Holiday it caches the current number of holidays in its region:

class Region < ActiveRecord::Base

...

ActiveRecord comes with a method touch which sets the updated_at timestamp to the current time. Unfortunately it also runs callbacks (and hence validations) on the receiving record, so it is unsuitable if you call it very often.

Use the attached initializer to get a touch_gently method which updates updated_at, but does not run callbacks:

User.find(5).touch_gently

The initializer will also give you a method touch_all_gently whi...