State machine example

gistfile1.txt

var events = [
    { name: 'approve', from: 'pending', to: 'approved'  },
    { name: 'reject', from: 'pending', to: 'rejected'  },
    { name: 'fail', from: '*', to: 'failed'  }
];

var callbacks = {
	onapprove: function(event, from, to, order) {
		
		var setObject = {
			'approvedAt': new Date(), 
			'state': to
		};

    //do anything else needed to approve this post

		Posts.update(order._id, {
			$set: setObject
		});
		
		
		}
	},
	.....
	onfail: function(event, from, to, order, error) {
		Posts.update(order._id, {$set: {
			'error': JSON.stringify(error),
			'errorMessage':errorMessage,
			'state': to
		}});
	}
};

getPostStateMachine = function(postId){
	var post = Posts.findOne(postId,{fields:{state:1}});
	//look up the current object to ensure we have a 'fresh' state
	if(post)
		return StateMachine.create({
			initial: post.state,
			events: events,
			callbacks: callbacks
		});
};




//////////

from a client event call
getPostStateMachine(post._id).pay(post);