Stephan stephan-v

Implementing State Machine On Eloquent Model*

* Update (12.09.2017): I have improved the trait so that it can be used with objects other than Eloquent Models.

Some days ago I came across a task where I needed to implement managable state for an Eloquent model. This is a common task, actually there is a mathematical model called "Finite-state Machine". The concept is that the state machine (SM) "can be in exactly one of the finite number of states at any given time". Also changing from one state to another (called transition) depends on fulfilling the conditions defined by its configuration.

Practically this means you define each state that the SM can be in and the possible transitions. To define a transition you set the states on which the transition can be applied (initial conditions) and the only state in which the SM should be after the transition.

That's the theory, let's get to the work.

Laravel Horizon, redis-server, supervisord on Ubuntu 20/22/24 server

Laravel 10+, Horizon 5.x, Redis/Valkey 7+

Prepare application

Install and configure Laravel Horizon as instructed in docs
Make sure you can access the Horizon dashboard like - http://yourapp.com/horizon
For now; it should show status as inactive on horizon dashboard

Install redis-server

	sudo add-apt-repository ppa:pinepain/libv8-5.2
	sudo apt-get update
	sudo apt-get install libv8-5.2
	sudo pecl install v8js
	sudo su
	echo "extension=v8js.so" >> /etc/php/7.1/fpm/php.ini
	echo "extension=v8js.so" >> /etc/php/7.1/cli/php.ini
	exit
	sudo service nginx restart && sudo service php7.1-fpm restart