Interesting interview with DHH, where he talks about how they made the new Basecamp feel very fast without using a lot of Javascript (most of Basecamp still lives on the server). The two tricks they used are PJAX and Russian Doll Caching.

pjax loads HTML from your server into the current page without a full reload. It's ajax with real permalinks, page titles, and a working back button that fully degrades.

pjax enhances the browsing experience - nothing more.

If a customer calls and tells you that she cannot see some content of her website beware of the following before starting tcpdump or other forensic debugging tools.

Some ad blockers like Adblock are shipped with filters that remove (amongst others)

• divs named 'sponsor'
• images with a class "banner" or the filename "banner.png"
• images from directories named 'sponsor*'
• Image names or class names that begin with adv_....

Renaming the div to something more specific to your site and renaming...

If you have an html_safe string, you won't be able to call gsub with a block and match reference variables like $1. They will be nil inside the block where you define replacements (as you already know).

This issue applies to both Rails 2 (with rails_xss) as well as Rails 3 applications.

Here is a fix to SafeBuffer#gsub. Note that it will only fix the $1 behavior, not give you a safe string in the end (see below).

Example

def test(input)...

If (for some reason that you don't want to ask yourself) you need to know all classes that define a method with a given name, you can do it like this:

def classes_defining_method(method_name)
  method_name = method_name.to_sym
  ObjectSpace.each_object(Module).select do |mod|
    instance_methods = mod.instance_methods.map(&:to_sym) # strings in old Rubies, symbols in new Rubies
    (instance_methods & [method_name]).any? && mod.instance_method(method_name).owner == mod
  end
end

So, when we want to know all...

If you want to update some records with boolean fields in a migration, always remember to set your values with field=#{quoted_true} and field=#{quoted_false}. The Rails methods quoted_false and quoted_true return the correct boolean representations for your database.

If you get errors from your development WEBrick that contain unicode salad, you are probably requesting the page via SSL. \
Since WEBrick does not speak SSL, so change the URL in your browser to use http instead of https.

The error looked like this for me:

[2012-09-06 11:19:07] ERROR bad URI `\000\026\000\020\000'.
[2012-09-06 11:19:07] ERROR bad URI `\000\026\000\020\000'.
[2012-09-06 11:19:07] ERROR bad Request-Line `\026\003\001\000�\001\000\000\177\003\001PHj�\031\006�L��'.
[2012-09-06 11:19:07] ERROR bad URI `\000\026\000\...

A print stylesheet is easy to create. Choose a font suited for paper, hide some elements, done. Unfortunately print stylesheets often break as the application is developed further, because they are quickly forgotten and nobody bothers to check if their change breaks the print stylesheet.

This card describes how to write a simple Cucumber feature that tests some aspects of a print stylesheets. This way, the requirement of having a print stylesheet is manifested in your tests and cannot be inadvertedly removed from the code. Note that you can...

This article describes how to reset MySQL's or MariaDB's root password on your workstation. It's meant for local development purposes only, don't do this in production. This article will also help you if you have a fairly recent MariaDB version that uses authentication based on linux users instead of passwords for the root user and you prefer using a password for root.

Solution

Step 1 is getting a root mysql shell that allows us to change user credentials. We need to stop the mysql daemon first and re-start it without authorization c...

There are many fun Unicode characters like ▲ or ☯. You might be tempted to use them for graphical elements in lieu for an image. After all they are so much easier to style and scale than a raster image!

Unfortunately you will discover that these symbols render very differently on Linux, Windows and MacOS. The reason for this is that the font you are using will probably not contain any characters outside the standard Latin-1 set. When browsers encounter a character not included in the current font, they use a fallback font for this one cha...

Nice list of icon sets that come in the form of fonts.

I recommend Font Awesome.

Run

sudo apt-get install gnome-session-fallback

or (alias)

sudo apt-get install gnome-panel

from a terminal.
Then logout to reach the logon screen and click on the options button next to you name.
Select Gnome Classic, log in et voilà.

This works in modern RSpecs (RSpec >= 2.x) and Cucumbers:

rspec spec/models/node_spec.rb:294:322
cucumber features/nodes.feature:543:563:579

Also your features should be shorter than that :)

RubyMine: Set specific Ruby version per project

Assuming the following sunspot setup of the post class:

class Post < ActiveRecord::Base
  searchable do
    text :title
    string :state
    integer :category_ids
  end
end

In Sunspot you can scope your search via the with method. It allows you to do stuff like:

Post.search {
  fulltext "your query", :fields => :title
  with(:category_ids).any_of([1,2,3,4,5])
}

If you want to scope your search based on a text field, you have to add another field of the type string (such as the state fi...

When committing, you should always check the diff of your changes so you don't include any leftovers or irrelevant/bad changes. Any time spent on that is well invested as it saves you rejected merge requests or any mess you need to clean up later.

While you can just use git diff or git diff --cached (to diff staged changes), you can also have Git include the changes as a comment below the commit message:

git commit -v

That will open up the usual commit "file" in your preferred text editor, but it will include a diff below the s...

Jedes nicht rein private Profil auf Social Media Portalen muss ein Impressum haben, das heißt insbesondere Unternehmen und Freiberufler (§ 5 Abs.1 TMG). Wer das Impressum dort nicht unter einem eigene Button mit der Aufschrift “Impressum” oder “Kontakt” unterbringt, bietet eine große Angriffsfläche für Abmahner (Quelle: http://rechtsanwalt-schwenke.de/impressumspflicht-bei-google-plus-und-twitter/).

Hier also in kurzen Schritten, wie man ein Impressum erstellt und wie man es bei Facebook und Twitter einbindet:

#1. Impressum erstellen

Ic...

Sometimes you need to look at the filter chain in specs. You can do it like that on Rails 2:

controller.class.filter_chain.map(&:method)

Note that we need to look at the controller's class since before_filter and after_filter stuff happens on the class level.

Also mind that the above code will give you all filters, both those run before and after an action. You can query before? and after? on the filter objects to scope down to only some of them:

controller.class.filter_chain.select(&:before?).map(&:method)

For Rails 3, ...

Methods to remove e.g. order or conditions from an existing scope chain.

I was experiencing the following problem:

 It seems your ruby installation is missing psych (for YAML output). 
 To eliminate this warning, please install libyaml and reinstall your ruby

So I tried to install the libyaml package via:

rvm pkg install libyaml

This is when I experienced the SSL certification problem mentioned above. This happens when your RVM certificates have expired. You can fix this by updating them via:

 rvm get stable

After doing that curl could verify the SSL certificate and I w...

If you encounter a Firefox that does not care about your font settings but always uses specific fonts, you can fix that. Usually this should not happen, as it's not a default setting:

1. Open up the Preferences.
2. Switch to "Content".
3. In the "Fonts & Colors" section, click the "Advanced..." button.
4. Tick "Allow pages to choose their own fonts, instead of my selection above".
5. Confirm by pressing "OK".

![Screenshot](https://makandracards.com/makandra/10913-how-to-fix-firefox-uses-incorrect-fonts-on-all-webpages-regardless-of-their-c...

Never name your shared example group *_spec.rb. Otherwise rspec will try to load your example group as a spec and you will get the error above.

So your Cucumber feature sometimes dies with this exception:

Modal Dialog Present (Selenium::WebDriver::Error::UnhandledAlertError)

As a seasoned Selenium veteran you are used to misleading error messages. Hence you might be surprised that the reason for this particular error is that there is actually a modal dialog present and preventing Selenium from executing commands like click or page.have_css?.

How your code triggers this issue

The reason why a dialog is shown is somewhat fucked ...

How delayed jobs can make your after_save callbacks execute before the record is saved.