Events
You can learn more about events in general in the Symfony documentation.
What is the naming convention of Sylius events?
The events that are designed for the entities have a general naming convention: sylius.entity_name.event_name.
The examples of such events are: sylius.product.pre_update, sylius.shop_user.post_create, sylius.taxon.pre_create.
Events reference
All Sylius bundles are using SyliusResourceBundle, which has some built-in events.
sylius.<resource>.pre_create
Before persist
sylius.<resource>.post_create
After flush
sylius.<resource>.pre_update
Before flush
sylius.<resource>.post_update
After flush
sylius.<resource>.pre_delete
Before remove
sylius.<resource>.post_delete
After flush
sylius.<resource>.initialize_create
Before creating view
sylius.<resource>.initialize_update
Before creating view
CRUD events rules
As you should already know, every resource controller is represented by the sylius.controller.<resource_name> service. Several useful events are dispatched during the execution of every default action of this controller. When creating a new resource via the createAction method, 2 events occur.
First, before the persist() is called on the resource, the sylius.<resource_name>.pre_create event is dispatched.
After the data storage is updated, sylius.<resource_name>.post_create is triggered.
The same set of events is available for the update and delete operations. All the dispatches are using the GenericEvent class and return the resource object by the getSubject method.
Checkout events rules
To dispatch checkout steps the event names are overloaded. See _sylius.event in src/Sylius/Bundle/ShopBundle/Resources/config/routing/checkout.yml
sylius.order.initialize_address
Before creating address view
sylius.order.initialize_select_shipping
Before creating shipping view
sylius.order.initialize_payment
Before creating payment view
sylius.order.initialize_complete
Before creating complete view
What events are already used in Sylius?
Even though Sylius has events as entry points to each resource only some of these points are already used in our use cases.
The events already used in Sylius are described in the Book alongside the concepts they concern.
What is more, you can easily check all the Sylius events in your application by using this command:
php bin/console debug:event-dispatcher | grep sylius
Customizations
Customizing Logic via Events vs. State Machines
The logic in which Sylius operates can be customized in two ways. The first of them is using the state machines: which is useful when you need to modify business logic for instance modify the flow of the checkout, and the second is listening to the kernel events related to the entities, which helps modify the HTTP responses visible directly to the user, like displaying notifications, sending emails.
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