Rails - Can I use observer to cancel the save of a model

Question

I have a before_save observer in one of my models, can I cancel the saving process if a certain condition is matched in the observer?

Answer 1

Yes you can. Just return false from your observer. It will cancel the save.

At least if you use Rails 3.1 that is. If you use an older version of Rails, you have to define a callback method using:

class MyModel < ActiveRecord::Base
  before_save :my_callback

  def my_callback
    # do something
    false
  end
end