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Workflow

Implementation of the Symfony Workflow component in Laravel

Installation

Add a ServiceProvider to your providers array in config/app.php:

Add the Workflow facade to your facades array:

Configuration

Publish the config file

Configure your workflow in config/workflow.php

A more minimal setup (for a workflow on an eloquent model).

If you are using a "multiple_state" type of workflow (i.e. you will be in multiple places simultaneously in your workflow), you will need your supported class/Eloquent model to cast the marking to an array. Read more in the Laravel docs.

You may also add in metadata, similar to the Symfony implementation (note: it is not collected the same way as Symfony's implementation, but should work the same. Please open a pull request or issue if that's not the case.)

Use the WorkflowTrait inside supported classes

Usage

Symfony Workflow Usage

Once you have the underlying Symfony workflow component, you can do anything you want, just like you would in Symfony. A couple examples are provided below, but be sure to take a look at the Symfony docs to better understand what's going on here.

Use the events

This package provides a list of events fired during a transition

You are encouraged to use Symfony's dot syntax style of event emission, as this provides the best level of precision for listening to events and prevents receiving the same event class multiple times for the "same" event. The workflow component dispatches multiple events per workflow event, and the translation into Laravel events can cause "duplicate" events to be listened to if you only listen by class name.

NOTE: these events receive the Symfony event prior to version 3.1.1, and will receive this package's events starting with version 3.1.1

You can subscribe to events in a more typical Laravel-style, although this is no longer recommended as it can result in "duplicate" events depending on how you listen to events.

Workflow vs State Machine

When using a multi-state workflow, it becomes necessary to distinguish between an array of multiple places that can transition to one place, or a situation where a subject in exactly multiple places transitions to one. Since the config is a PHP array, you must "nest" the latter situation into an array, so that it builds a transition using an array of places, rather that looping through single places.

Example 1. Exactly two places transition to one

In this example, a draft must be in both content_approved and legal_approved at the same time

Example 2. Either of two places transition to one

In this example, a draft can transition from EITHER content_approved OR legal_approved to published

Dump Workflows

Symfony workflow uses GraphvizDumper to create the workflow image. You may need to install the dot command of Graphviz

php artisan workflow:dump workflow_name --class App\\BlogPost

You can change the image format with the --format option. By default the format is png.

php artisan workflow:dump workflow_name --format=jpg

If you would like to output to a different directory than root, you can use the --disk and --path options to set the Storage disk (local by default) and path (root_path() by default).

php artisan workflow:dump workflow-name --class=App\\BlogPost --disk=s3 --path="workflows/diagrams/"

Use in tracking mode

If you are loading workflow definitions through some dynamic means (perhaps via DB), you'll most likely want to turn on registry tracking. This will enable you to see what has been loaded, to prevent or ignore duplicate workflow definitions.

Set track_loaded to true in the workflow_registry.php config file.

You can dynamically load a workflow by using the addFromArray method on the workflow registry

NOTE: There's no persistence for dynamic workflows, this package assumes you're storing those somehow (DB, etc). To use the dynamic workflows, you will need to load the workflow prior to using it. The loadWorkflow() method above could be tied into a model boot() or similar.

You may also specify an initial_places in your workflow definition, if it is not the first place in the "places" list.