The information in this card is only relevant for Rails 2.3-era apps. This note gives a quick introduction into...

Note that you cannot currently use Ruby 1.9.2 with Rails 2 applications that use RSpec, so don't upgrade if...

Specify these gem versions in your Gemfile: gem 'cucumber', '~> 1.3.0' gem 'cucumber-rails', '= 0.3.2' # max version for Rails 2

The shell variable PS1 holds your bash prompt. You might want to change it to serve your needs best. Here...

After updating your RubyGems, you will probably not be able to run Capistrano any more, but receive an error similar...

RubyGems 1.6.0 has undergone some changes which may cause Rails 2.x applications to break with an error like this...

If you want to get a deep understanding of how closures, blocks, procs & lambdas in Ruby work, check out the...

Although you can access many symbols using the AltGr key you may be missing some, like the en-dash (–) or...

Note: For PostgreSQL you should use advisory locks. For MySQL we still recommend the solution in this card.

See our new comprehensive guide for upgrading every Rails 2 version ever.

When you try to remove a non-existing index using remove_index, the migration will incorrectly pass without an error...

A check if two date or time ranges A and B overlap needs to cover a lot of cases:

Sometimes it is useful to define a named scope by implementing a static method with the scope's name on...

Given group size If you would like to split a Ruby array into pairs of two, you can use the...

You cannot use Array#join on an array of strings where some strings are html_safe and others are not...

Update: This trick probably isn't very useful anymore in Ruby 2.x. The Ruby GC has improved a lot...

In January this year (2010), Gmail switched to using HTTPS for everything by default. Previously it had been introduced as...

See our new comprehensive guide to upgrading every Rails 2 version ever.

In RSpec 2 shared_examples_for can have parameters. You can simply hand over arguments from it_behaves...

When you eagerly load an association list using the .include option, and at the same time have a .where on...

RSpec 1, RSpec 2 To test whether two arrays have the same elements regardless of order, RSpec 1 and 2...

When using an odd value for line-height in CSS the result will vary across all major browsers.\

To only run the next two migrations: rake db:migrate STEP=2 To revert the previous two migrations:

Thanks to habits engrained by Rails 2’s link_to_remote and remote_form_for, we expect that Rails 3...