Interesting

• Ruby MRI seems to have taken a step back in time, a dangerous, but useful feature (to some) is the goto statement.

• It appears that DateTime object has some issues with doing math.

  DateTime.now - 1.hour #raises TypeError
  DateTime.now - 3600   #works as expected
  1.hour.class          #Fixnum
  

• Reading the CSS property background-position in Chrome returns an invalid value. Don’t rely on it.

• Github was hacked! They had a security issue that was a result of attr_accessible being uses incorrectly. Remember to authorize your SSH keys.
• Need help with cron? Use http://cronwtf.github.com to convert cron into friendly English.
• &&, ||, and ! vs. and, or, and not. It is highly recommended to always use the strict logical operators (&&, ||, and !) because the keywords
  (and, or, and not) don’t have the same operator precedence.
• When evaluating variables in strings with bash, its better to use ${var} than $var. The curly-brace allows you to evaluate a variable with copy behind it. For example, ${var}asdf and $varasdf evaluate differently because of the expected variable name.

Help

• Rails <3.1 has some gotchyas when using :inverse_of option.

  class Note < ActiveRecord::Base
    has_many :contacts, inverse_of: :note
  end
  
  
  class Contact < ActiveRecord::Base
    belongs_to :note, touch: true #for triggering the note observer when the contact is updated
  end
  
  
  class NotObserver
    def after_touch(note)
      note.contacts # does not have the new attributes updated unless you specify the :inverse_of
    end
  end
  
  
  # Somewhere in the code...
  contact.update_attributes....
  

• When table names are not namespaced on a class. What is the best way to work with this if we want table names to be namespaced?

  class Foo::Bar < ActiveRecord::Base
  end
  
  
  > Foo::Bar.table_name == "bars"
  true