• You might have notices this behavior when you cut a selection or use the rubber tool.
• The behavior depends on whether your images has an alpha channel.
• You can add an alpha channel by choosing Layer → Transparency → Add alpha channel

You will find this useful when creating responsive designs that work well on small screens.

The attached Javascript gives a container different CSS classes (single_line or multiple_lines) depending on whether its children render on one line or multiple lines.

Initialize it with the selectors for container and children:

$(function() {
  $('.navigation').countLines('a');
});

You can now use different CSS styles like this:

.navigation
  &.single_line a
    // styles when all anchors are rendered on the same line...

If your project uses another version than your default Ruby, RubyMine will give you incorrect inspections, for example.\
Here is how to switch which Ruby you use in RubyMine.

1. File → Settings (Or press Ctrl+Alt+S)
2. Select "Ruby SDK and Gems" from the left pane
3. Switch your "Ruby interpreter".

Though it may seem you are changing a global setting here, this is in fact a per-project setting, as are all things you change in the "Project Settings [your_project_name]" area of the global settings dialog.

When you switch to another proje...

Embedding bitmap images within PDF sometimes results in large files because the bitmaps are not compressed. If you don't need high quality images within the resulting PDF file, you can use ghostscript to compress embedded images:

ghostscript -sDEVICE=pdfwrite -dCompatibilityLevel=1.4 -dPDFSETTINGS=/ebook -dNOPAUSE -dQUIET -dBATCH -sOutputFile=new-smaller-file.pdf large-original-file.pdf

Note that your PDF printer (or similiar generation tools) also often come with a compression setting for embedded raster images.

You can put this ...

There is now a solution.

There is a conflict between current capistrano versions and the 2.5.1 net-ssh gem. Make sure you upgrade to 2.5.2, then it should work again.

MySQL version 5.1 comes with an alternative, faster InnoDB implementation (called "InnoDB Plugin").

Switching is easy:

• Stop your mysqld with sudo stop mysql
• Add the following lines to your /etc/mysql/my.cnf under the [mysqld] section
  ignore-builtin-innodb
  plugin-load=innodb=ha_innodb_plugin.so
• Start your mysqld with sudo start mysql

The file format has not changed, your tables should survive this.

Note: This is not necessary in MySQL 5.5, where the new implementation is the default.

TL;DR

%p
  #{link_to "label", "url"}!

Haml is a great engine for writing shorter, readable HTML. However, there is one thing that troubles me regularly. Consider this Haml code:

%p
  Visit our homepage at
  = link_to "www.makandra.com", "http://www.makandra.com"
  !

Haml will insert a space around the generated link, the result is this (see the space before the exclamation mark!):

<p>
  Visit our website at <a href="http://www.makandra.com">www.makandra.com</a> !
</p>

They suggest to us...

Using beginning_of_day or end_of_day on Date or DateTime objects in Rails 2.x applications will never respect time zones, which is horrible.\
This is fixed in Rails 3, though.

Even when using Date.current or DateTime.current you will get regular Time or DateTime objects:

>> Date.current.beginning_of_day.class
=> Time # not a ActiveSupport::TimeWithZone as expected
>> DateTime.current.beginning_of_day.class
=> DateTime ...

Today, this line made me trouble. Can you spot the mistake?

match 'sitemap.xml' => 'feeds#sitemap', :constraints => { :format => 'xml' }, :as => 'sitemap'

The mistake is to match sitemap.xml. Rails will by default strip any dot-anything, remember it as desired format and forward the rest of the request to the routing engine. Since we're making .xml part of the match, it is not available for format determination and Rails will set the format to html.

Unfortunately, the constraint won't complain in this case and Rails even ren...

Removing duplication from the code is a seemingly easy task. In many cases it is pretty straight-forward – you look at similar bits of code and you move them to a common method or class that is reusable in other places. Right? No, not really. It is true that code that looks similar might be an indicator that there’s a duplication but it’s not the definitive way of determining the smell.

If we look for duplication in our code we should look for duplicated concepts instead of similarly looking lines of code.

Slides presenting ways to integrate the ideas of Aspect-Oriented Programming in Ruby.

Outline

• Why Aspect-Oriented Programming?
• AOP in Java and AspectJ (a Review).
• AOP in Ruby.
  • What you can do today.
  • Example AOP-isms in Ruby on Rails.
• Aspect-Oriented Design.
• The AOP Promise for Tomorrow.

uname -m

i686 means 32-bit.

If you get an error like this ...

 can’t find executable rails for rails-3.2.3 (Gem::Exception)

... one of several things might be wrong.

1. You're using RVM

It's possible that you have a system-wide gem executable (like rails) that requires a gem that is not available in the current RVM Ruby or gemset. Check what Ruby you are using (rvm current) and look out for .rvmrc files in your current directory (which change your Ruby upon entering the directory).

2. You killed a gem install process
   ----------...

How to call routes, make requests and try out helpers from the Rails console.

OCRA (One-Click Ruby Application) builds Windows executables from Ruby source code. The executable is a self-extracting, self-running executable that contains the Ruby interpreter, your source code and any additionally needed ruby libraries or DLL.

ocra [option] script.rb

Will package “script.rb“, the Ruby interpreter and all dependencies (gems and DLLs) into an executable named “script.exe“.

Every time I started RubyMine, it opened the main window on the left monitor -- when moving it to the center monitor and closing it, the next time it still opened up on the left one.

Here is how I forced RubyMine to start up on a different screen:

1. Un-maximize the main window
2. Move it to your preferred monitor
3. Close RubyMine (keep it unmaximized)
4. Start RubyMine again.
5. You may now maximize your main window; the next time you start up RubyMine, it will open on the correct screen, maximized.

That's crazy!

DTAUS & DTAZV are formats for German bank transfers and is short for "Datenträgeraustausch". The format itself totally sucks because it was established in the last century, to be used on floppy disks. Still almost all German banks use it (they only seem innovative at robbing), and it is therefore supported in common banking programs too.

This gem saves you all the trouble when generating DTAUS- or DTAZV-text.

Our awesome collection of rspec helpers (formerly known as "spec_candy.rb") is now available as a gem. It works, it is tested and there will be updates.

Usage

Add rspec_candy to your Gemfile.

Add require 'rspec_candy/helpers' to your spec_helper.rb, after the rspec requires.

List of features

See on GitHub

Though the W3C even gives it as an example, no browser actually supports this CSS:

img:before {
  content: "something";
}

Browsers will simply not render anything when doing that on images (Fun fact: It worked in an older version of Opera but got dropped).\
The same applies to the :after pseudo-element.

This makes me sad.

You can try using jQuery instead.

Sometimes you need a special version of chrome because it has some features you need for testing, like in this card. You do not need to use that Version apart from tests, because you can tweek selenium to use a special version that you set in your environment:

# features/support/chrome.rb
require "selenium/webdriver"

Capybara.register_driver :chrome320x480 do |app|
  
  if driver_path = ENV["CHROME_SELENIUM_BIN...