Before callback doesn't work in AASM/Ruby

Question

I'm trying to work on a finite state machine with AASM in Ruby. This is a part of my code:

event :Orthography, :before => :to_lowercase do
    puts "Check Orthography"
    transitions :from => :Initialized, :to => :UniquenessChecked
end

event :Uniqueness do
    puts "Check Uniqueness"
    transitions :from => :UniquenessChecked, :to => :OrthographyChecked
end

... 

def to_lowercase
    puts "To lowercase test"
end

I get as puts log:

Check Orthography
Check Uniqueness
To lowercase test

But I expect, because I use the before callback:

To lowercase test
Check Orthography
Check Uniqueness

How can I do something before or on enter of a event?

Answer 1

Your to_lowercase method is called before the event.

I guess you are confused by the Check Orthography and Check Uniqueness outputs that happen before the To lowercase test . This happens because the first two puts are defined on class level and are printed when the file is read and the state machine is configured.

Whereas the last puts is called in a method, when the instance is already created and a event is fired.

You can test that by defining the state machine, but not firing any events: You will still see the output from the state machine definition.