Interestings

Webtoolkit Base64 encoding is wrong

If you need to do Base64 encoding/decoding in JavaScript, you likely came across this link (as it’s the #1 Google hit for: “base64 enocde javascript”):

http://www.webtoolkit.info/javascript-base64.html

This code (for encode) works just fine as long as you’re only dealing with strings whose contents are plain ASCII test (no high bits set).

But this code does a UTF encode before the Base64 encode. Which means that any characters with the high-bit set will get expanded first and your Base64 encoding will be wrong. For example, if you build a SHA1 encoded string and then Base64 encode it, you’ll get a resultant string that’s longer than the expected 28 bytes.

Our solution was to keep Googling around until we found some JavaScript Base64 code that did not do any Unicode expansion. Here’s one that does the right thing – there are more, but are hard to find:

http://nerds-central.blogspot.com/2007/01/fast-scalable-javascript-and-vbscript.html

Factory Girl after_create

You might want to use factory_girl to create an object that includes another object. If both factory methods make use of the after_create callback the child’s after_create will be called before the parent’s. This behavior might seem unintuitive and you should keep this in mind working with factory_girl.

Ruby Mine running focused tests from inside context

It turns out that having shoulda anywhere in your project will break running focused tests from inside a context. This will also break ii you use a plugin that comes with shoulda.

Ruby Mine commit & push

Ruby Mine’s behavior when using commit together with the push option might not behave as expected. For us it merged a branch and truncated all changes that had occurred on that branch since the last update.

WebKit JS treats “export” as keyword

One of the many unused keywords in JavaScript is “export”. Firefox lets you use it since it’s de facto unused. However, using “export” in your JavaScript will break your code in WebKit-based browseres.

Interesting — Tagging and Excluding of Filters in Solr Facets

You may want to use multi-select faceting to constrain the results shown for one facet but still want to see the values and counts of other facets that are not matched by your constraint. To solve this you often had to use two queries. Since Solr 1.4 you can tag and exclude filters and save the additional query.

Help — Adding Memcached to Models

“I want to use memcached for my ActiveRecord models and am looking for recommendations on how to do this”

Of the available gems the memcached gem can be recommended. The memcached gem wraps the libmemcached client which is written in pure C. This implementation gives it a performance advantage over the memcached_client gem.

Interesting — Backtrace in RSpec

Since version 1.2.9 RSpec per default does not print the full backtrace. Calling spec with the -b --backtrace option will print the full trace.

Interestings

gmail_smtp plugin not needed with Ruby 1.8.7

If you uses Ruby 1.8.7 or higher you can natively connect to Gmail and do not need to install a plugin as you used to with older Ruby versions .

selenium/webrat/snowleopard

Selenium uses webrat as default which causes problems under Snowleopard. Getting the latest version of Selenium and replacing the gem’s JAR-file with it will solve this problem.

Ask for Help

Reloading libs in development

“How to setup Rails to reload libraries under development?”

The initializer block in environment.rb contains the line

<code>config.load_paths += %W( #{RAILS_ROOT}/extras )</code>

which is commented out by default. Here the lib folder can be added in order to have it reloaded.

Selenium with with Firefox 3.6

"How to get Firefox 3.6 to work with Selenium?"

Your need to install he latest gem for Selenium RC from gem cutter. You then need to get the latest version of Selenium and replace the gem's JAR file with the latest one you just downloaded.

Using relative picture size to crop from original image.

"I am using Paperclip and need the size of the original picture"

Paperclip::Geometry offers methods to get the image's dimensions. However, if you want to access those for a new file, the earliest you can access these is with the after_save hook. Thus you might have to save the file twice.