Question

Is it possible to invoke a method when the initial state is entered when using the AASM Gem? I’d like the spam_check method to get called when a comment is submitted, but it doesn’t seem to work.

class Comment < ActiveRecord::Base   include AASM    aasm_column :state   aasm_initial_state :submitted   aasm_state :submitted, :enter => :spam_check   aasm_state :approved   aasm_state :rejected    aasm_event :ham do     transitions :to => :approved, :from => [:submitted, :rejected]   end    aasm_event :spam do     transitions :to => :rejected, :from => [:submitted, :approved]   end    def spam_check     # Mark the comment as spam or ham...   end end 

Answer 1

My guess is, that since the spam checking is taking place just before the initial state is set, your :spam and :ham transitions can’t be executed, since the :from condition says the state should be :submitted, :rejected or :approved (but in the fact, it’s nil). Initial state is set on before_validation_on_create callback, so what about trying it like this?

after_validation_on_create :spam_check  aasm_event :spam_check do   transitions :to => :approved, :from => [:submitted, :rejected], :guard => Proc.new {|c| !c.spam?}    transitions :to => :rejected, :from => [:submitted, :approved], :guard => 'spam?' end  def spam?   # your spam checking routine end 

This should fire the spam_check event after the initial_state was set and will set ste state to either :approved or :rejected.