Use Sass without Rails

You don't need a Rails application to use Sass. Even when you're working on a static site you can generate your CSS through Sass.

  • Install Sass with sudo gem install haml
  • Create a folder sass in the folder, that stores your stylesheets, e.g. mkdir css/sass
  • In a separate terminal window, run sass --watch css/sass:css. This will watch your sass files for changes and rewrite stylesheets as required.

This even works on Windows.

Note about your .gitignore

You might want to change our [typical .gitignor...

Run a rake task in all environments

Use like this:

power-rake db:migrate VERSION=20100913132321

By default the environments development, test, cucumber and performance are considered. The script will not run rake on a production or staging environment.


This script is part of our geordi gem on github.

Install RubyGems on Ubuntu/Debian

First of all: You could just use RVM which would make the pain go away. If for some reason you can't, proceed.


Do not use rubygems from the apt repository.

  1. Get the latest RubyGems TGZ
  2. Change to the download directory and extract it:\
    tar xvfz rubygems-1.3.7.tgz
  3. If you previously had RubyGems installed via apt: \
    sudo apt-get remove rubygems
  4. Install RubyGems:\
    cd rubygems-1.3.7 && sudo ruby setup.rb
  5. Link gem to gem1.8:\
    `sudo ...

Detect the language of a string

You can use the whatlanguage gem to detect the language of a Ruby string.
Note that it also has not been updated in quite a while and that there might be alternatives. However, it still works.

It has problems with short strings, but works quite well on longer texts.

Use it like this:

>> WhatLanguage.new(:all).language('Half the price of a hotel for twice the space')
=> :english

There is also a convenience method on Strings (you may need to require 'whatlanguage/string').

>> 'Wir ent...

rhulse's rails-css-views at master - GitHub

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

Install a local Gemfile on a remote server

Call with the server's hostname (and user if you have no SSH agent), e.g.

install-gems-remotely my.server.com
# or without agent:
install-gems-remotely me@my.server.com

When you call it from a rails directory, it uploads your Gemfile, Gemfile.lock as well as the gemspecs of all vendored gems in to a temporary folder on the server and does a bundle install there.

If you need to install gems from anothere Gemfile, just do it like this:
BUNDLE_GEMFILE=Gemfile.something; install-gems-remotely my.server.com


This scri...

Debug Ruby code

This is an awesome gadget in your toolbox, even if your test coverage is great.

  • gem install ruby-debug (Ruby 1.8) or gem install debugger (Ruby 1.9)
  • Start your server with script/server --debugger
  • Set a breakpoint by invoking debugger anywhere in your code
  • Open your application in the browser and run the code path that crosses the breakpoint
  • Once you reach the breakpoint, the page loading will seem to "hang".
  • Switch to the shell you started the server with. That shell will be running an irb session where you can step thr...

Override e-mail recipients in ActionMailer

Our gem Mail Magnet allows you to override e-mail recipients in ActionMailer so all mails go to a given address.

This is useful for staging environments where you want to test production-like mail delivery without sending e-mails to real users.

Automatically run bundle exec if required

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.

Load order of the environment

Rails 3, 4, 5, 6

  1. config/application.rb
  2. config/environment.rb before the initialize! call (we don't usually edit this file)
  3. The current environment, e.g. environments/production.rb
  4. Gems
  5. Vendored plugins
  6. All initializers in config/initializers/*.rb
  7. config/environment.rb after the initialize! call (we don't usually edit this file)
  8. Your own code from app

Rails 2

  1. Code in config/preinitializer.rb (if it exists)
  2. environment.rb, code above the Rails::Initializer.run blo...

Scope to records with a given state in state_machine

The state_machine gem ships with a scope with_state. This scope has some problems in complex queries or scope chains.

Use this instead:

named_scope :having_state, lambda { |*state_or_states|
  state_or_states = Array.wrap(state_or_states).map(&:to_s)
  { :conditions => [ 'articles.state IN (?)', state_or_states ] }
}

If you want a scope with hash options (with the side effects you should know about):

named_scope :having_st...

Bundler for Rails 2.3.x

Update RubyGems and Passenger

Bundler requires Rubygems >= 1.3.6. Run gem update --system if you have an older version.
It also is not compatible with older versions of passenger, so bring that up to date as well (2.2.15 works).

If you installed RubyGems through apt (which you should never do!), you may see a message giving you a hint to use apt to update.
Some people advise to install the 'rubygems-update-1.3.7' gem on Ubuntu systems if you used apt to install RubyGems.
I did that - and lost all...

Recursively remove unnecessary executable-flags

Sometimes files attain executable-flags that they do not need, e.g. when your Windows VM copies them over a Samba share onto your machine.

From inside your Rails project directory call regularly:

geordi remove-executable-flags

Runs chmod -x on Ruby, HTML, CSS, image, Rake and similar files.


This script is part of our geordi gem on github.

Boolean attributes and pretty enumerations in Cucumber Factory 1.7

Boolean attributes can now be set by appending "which", "that" or "who" at the end:

Given there is a movie which is awesome
And there is a movie with the name "Sunshine" that is not a comedy
And there is a director who is popular

Instead of "and" you can now also use "but" and commas to join sentences:

Given there is a movie which is awesome, popular and successful but not science fiction
And there is a director with the income "500000" but with the account balance "-30000"

Update with `sudo gem install cucumber_facto...

How Rails and MySQL are handling time zones

When working with times and dates in Rails applications, you need to deal with the following problem:

  • In Rails, Time objects have a time zone. You can get the zone name by doing time_object.zone.
  • This zone is considered when doing time calculations, e.g. 10 AM CEST minus 8 AM UTC is zero.
  • A datetime in MySQL does not have a zone. It just stores the literal string "2010-05-01 12:00:00".
  • That means that Rails must make assumptions about timestamps loaded from and written to MySQL.

Rails has two completely different modes ...

Run a POP3 server on a directory of mail files with popthis

popthis is awesome when used with inaction_mailer.

Setup inaction_mailer

Install the gem:
sudo gem install popthis

Start the server:
popthis tmp/sent_mails/ # e.g. the folder containing the .txt-mails generated by inaction_mailer

Now, configure your mail client as follows:
Server: localhost
Protocol: POP3
Port: 2220
Username: anything
Password: anything

Marry Capybara with SSL-enabled applications

Capybara does not play nice with sites that have some actions protected by SSL, some not. A popular way to implement this in Rails is using the ssl_requirement plugin by DHH, which redirects a requests from HTTP to HTTPS if the requested action requires SSL and vice versa.

Capybara follows the redirect, but seems to forget the changed protocol for the next request. The only hack-free workaround right now is to use URLs in lieu of paths everywhere (links, form actions).

For a hackful fi...

rspec_candy is now a gem

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

Announcing YARD 0.6.0 (gnuu.org)

YARD 0.6 adds the ability to serve documentation for gems as well as the current project with yard server. Just like gem server in RubyGems, you can serve gem docs. The advantage to YARD’s server is that you don’t need to pre-generate the static docs (with a gem install) before running the server. If you installed your gem with --no-rdoc, YARD will just generate it on the fly!

Build a JSON API for a Rails application

Try our Apify gem which solves many problems you will be having.

Error installing the raspell gem

When you get this while installing the raspell gem:

ERROR:  Error installing raspell:  
ERROR: Failed to build gem native extension.

You need some libraries:

sudo apt-get install libaspell-dev

Aspell Error - No word lists can be found for the language XY

When you get this error:

No word lists can be found for the language "de".

An aspell dictionary is missing. Install it with

sudo apt-get install aspell-de

stefankroes's ancestry at master - GitHub

Ancestry is a gem/plugin that allows the records of a Ruby on Rails ActiveRecord model to be organised as a tree structure (or hierarchy). It uses a single, intuitively formatted database column, using a variation on the materialised path pattern. It exposes all the standard tree structure relations (ancestors, parent, root, children, siblings, descendants) and all of them can be fetched in a single sql query. Additional features are STI support, named_scopes, depth caching, depth constraints, easy migration from older plugins/gems, integrit...