Records loaded with SQL fragments in :select or :joins become read-only in ActiveRecord to avoid saving rows with noncolumn attributes. :readonly => false overrides the safeguard.

Rails session and cookie lifetime defaults can be surprising, and Clearance authentication tokens expire separately. Changing expiry settings requires different configuration points or a patch to sign_in.

Embedded Flash movies do not always obey element order and z-index.

To fix this, set the wmode attribute to transparent in both <object> and <embed> tags:

<object ... >
  <param name="wmode" value="transparent" />
  <embed ... wmode="transparent" />
</object>

When submitting textareas, browsers sometimes include carriage returns (\r) instead of just line feeds (\n) at the end of each line. I don't know when this happens, and most of the time it doesn't matter.

In cases where it does matter, use the attached trait to remove carriage returns from one or more attributes like this:

class Note
  does 'strip_carriage_returns', :prose, :code
end

Here is the test that goes with it:

describe Note do

  describe 'before_validation' do...

If you iterate over a collection of arrays, you can destructure the arrays within the block parameters:

movies_and_directors = [
  ['The Big Lebowski', 'Coen Brothers'],
  ['Fight Club', 'David Fincher']
]
movies_and_directors.each do |movie, director|
  # do something
end

For nested array (e.g. when you use each_with_index), you can use parentheses for destructuring:

movies_and_directors.each_with_index do |(movie, director), index|
  # do something
end

RSpec examples that run only when invoked directly often need a proper _spec.rb filename; a plain .rb file may be skipped in the full suite.

Cucumber can use RSpec doubles instead of Mocha; loading the integration in env.rb keeps stubs and mocks available after other After hooks.

Since RubyMine 3.1 you can drag tabs across panes/windows and out of the main window to create new windows.

For any version below 3.1 do it like this (will only allow dragging tabs inside their pane, not across panes):

1. File → Settings
2. Editor → Editor Tabs
3. Check "Show tabs in single row"

Seriously.

1. sudo apt-get install i8kutils
2. Reboot
3. You can now run the i8k tools such as i8kmon

Setting the fan speed to high (2) will only work shortly as the fan is somehow controlled automatically.\
This helps you out in bash:
while true; do i8kfan - 2; sleep 0.2; done

There should be a better solution and it will be posted as soon as it's found.

Run bundle install on a remote host using a local Gemfile, even for vendored gems or a different BUNDLE_GEMFILE.

Lightweight browser text editor for comments, forum posts, and basic CMS text with live preview and minimal setup.

The following Haml will do:

%head{ :profile => 'http://www.w3.org/2005/10/profile' }
  %link{ :href => image_path('favicon.ico'), :rel => 'icon', :type => 'image/vnd.microsoft.icon' }

Note that while you can link to icon formats other than .ico, Internet Explorer is too stupid for that.

There will probably be better solutions as we become more experienced with using Bundler, and more command line tools become Bundler-aware.

b will use bundle exec if there is a Gemfile in the working directory, and run the call without Bundler otherwise.

b spec spec

This script is part of our geordi gem on github.

A jQuery plugin that sets a div or span to show a countdown to a given time

This post explains, in some detail, how we will implement a nice performance boost for Rails developers. Understanding the details might help gain the full benefits of the optimization, but you will gain some benefits even if you have no idea how it works.

Capistrano task for Bundler.

jQuery plugin for attractive image rollover captions on hover, adding simple animated text overlays to images.

This gem is designed to provide CSS views to Rails, and a process to concatenate and minify these files to one file for production.

Physical servers worked, EC2 did not.

Remove a mistakenly added file from the staging area while keeping local changes; git reset HEAD path/to/file also works for conflicted files.

The ECB has an XML feed with EURO exchange rates to other currencies. It is updated daily.