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Headless CMS > References

Lifecycle Events

Learn about Headless CMS lifecycle events, how they work and how to subscribe to a lifecycle event.

Deprecation of lifecycle events created before 5.34.0

In the 5.34.0 we changed the property names which define the lifecycle events in the Headless CMS. Old ones are still available, but are marked as deprecated. They will be removed in 5.35.0.

What you'll learn

what are lifecycle events
how lifecycle events work
how to subscribe to a lifecycle event

Lifecycle events using publish/subscribe pattern replace the hook plugins starting from version 5.18.0.

Overview

In our Headless CMS we provide lifecycle events available for you to hook into.

With the lifecycle events you can hook into a number of different operations. For example, when using DynamoDB + Elasticsearch external link as storage layer, we use the onSystemBeforeInstall to insert the template for Elasticsearch index.

System

onSystemBeforeInstall

This event is triggered before the installation of the Headless CMS and insertion of initial “Ungrouped” group.

Event Arguments

Property	Description
tenant	ID of the current tenant
locale	current locale

How to Subscribe to This Event?

onSystemAfterInstall

This event is triggered after the installation of the Headless CMS.

Event Arguments

Property	Description
tenant	ID of the current tenant
locale	current locale

How to Subscribe to This Event?

onSystemInstallError

This event is triggered on Headless CMS installation error.

Event Arguments

Property	Description
tenant	ID of the current tenant
locale	current locale

How to Subscribe to This Event?

Please note that in between onSystemBeforeInstall and onSystemAfterInstall we create a default CmsGroup named “Ungrouped” and, because of that, there are events onGroupBeforeCreate and onGroupAfterCreate being run.

Groups

onGroupBeforeCreate

This event is triggered before a new group is stored into the database.

Event Arguments

Property	Description
group	Group object which is going to be stored

How to Subscribe to This Event?

onGroupAfterCreate

This event is triggered after a new group is stored into the database.

Event Arguments

Property	Description
group	Group object which was stored

How to Subscribe to This Event?

onGroupCreateError

This event is triggered on group create error.

Event Arguments

Property	Description
group	Group object which was going to be created
error	Error object

How to Subscribe to This Event?

onGroupBeforeUpdate

This event is triggered before a group is changed and stored into the database.

Event Arguments

Property	Description
original	Group object which is received from the database
group	Group object which is going to be stored

How to Subscribe to This Event?

onGroupAfterUpdate

This event is triggered before a group is changed and stored into the database.

Event Arguments

Property	Description
original	Group object which is received from the database
group	Group object which was stored

How to Subscribe to This Event?

onGroupUpdateError

This event is triggered on group update error.

Event Arguments

Property	Description
original	Group object received from the database
group	Group object which was going to be updated
error	Error object

How to Subscribe to This Event?

onGroupBeforeDelete

This event is triggered before a group is deleted from the database.

Event Arguments

Property	Description
group	Group object which is going to be deleted

How to Subscribe to This Event?

onGroupAfterDelete

This event is triggered after a group is deleted from the database.

Event Arguments

Property	Description
group	Group object which was deleted

How to Subscribe to This Event?

onGroupDeleteError

This event is triggered on group delete error.

Event Arguments

Property	Description
group	Group object which was going to be deleted
error	Error object

How to Subscribe to This Event?

Model

onModelBeforeCreate

This event is triggered before a new model is stored into the database.

Event Arguments

Property	Description
input	Users raw input data
model	Model object which is going to be stored

How to Subscribe to This Event?

onModelAfterCreate

This event is triggered before a new model is stored into the database.

Event Arguments

Property	Description
input	Users raw input data
model	Model object which is going to be stored

How to Subscribe to This Event?

onModelCreateError

This event is triggered on model create error.

Event Arguments

Property	Description
input	Users raw input data
model	Model object which was going to be created
error	thrown error

How to Subscribe to This Event?

onModelBeforeCreateFrom

This event is triggered before a newly cloned model is stored into the database.

Event Arguments

Property	Description
original	Model object from which we are creating a new model
model	Model object which is going to be stored

How to Subscribe to This Event?

onModelAfterCreateFrom

This event is triggered after a newly cloned model is stored into the database.

Event Arguments

Property	Description
original	Model object from which we are creating a new model
model	Model object which was stored

How to Subscribe to This Event?

onModelCreateFromError

This event is triggered on model create from (clone) error.

Event Arguments

Property	Description
input	Users raw input data
original	Model which is being cloned
model	Model object which was going to be created
error	thrown error

How to Subscribe to This Event?

onModelBeforeUpdate

This event is triggered before a model is changed and stored into the database.

Event Arguments

Property	Description
original	Model object from which we received from the database
model	Model object which is going to be stored

How to Subscribe to This Event?

onModelAfterUpdate

This event is triggered after a model is changed and stored into the database.

Event Arguments

Property	Description
original	Model object from which we received from the database
model	Model object which was stored

How to Subscribe to This Event?

onModelUpdateError

This event is triggered on model update error.

Event Arguments

Property	Description
input	Users raw input data
original	Model which is being updated
model	Model object which was going to be stored
error	thrown error

How to Subscribe to This Event?

onModelBeforeDelete

This event is triggered before a model is deleted from the database.

Event Arguments

Property	Description
model	Model object which is going to be deleted

How to Subscribe to This Event?

onModelAfterDelete

This event is triggered after a model is deleted from the database.

Event Arguments

Property	Description
model	Model object which was deleted

How to Subscribe to This Event?

onModelDeleteError

This event is triggered on model delete error.

Event Arguments

Property	Description
Model	Model object which was going to be deleted
error	thrown error

How to Subscribe to This Event?

Entry

Note that storageEntry, originalStorageEntry, latestStorageEntry and publishedStorageEntry are objects derived from the entry object which we want to store into the database. Those new objects have StorageTransformPlugin run on them to prepare them to be stored.

onEntryBeforeCreate

This event is triggered before an entry is stored into the database.

Event Arguments

Property	Description
input	Raw user input
entry	Entry object which is going to be stored
model	Model this entry belongs to

How to Subscribe to This Event?

onEntryAfterCreate

This event is triggered after an entry is stored into the database.

Event Arguments

Property	Description
input	Raw user input
entry	Entry object which was stored
model	Model this entry belongs to

How to Subscribe to This Event?

onEntryCreateError

This event is triggered on entry create error.

Event Arguments

Property	Description
input	Raw user input
entry	Entry object which was going to be stored
model	Model this entry belongs to
error	thrown error

How to Subscribe to This Event?

onEntryRevisionBeforeCreate

This event is triggered before a new entry is created from originating entry and is stored into the database.

Event Arguments

Property	Description
input	Raw user input
original	Original entry which we received from the database
entry	Entry object which is going to be stored
model	Model this entry belongs to

How to Subscribe to This Event?

onEntryRevisionAfterCreate

This event is triggered after a new entry is created from originating entry and is stored into the database.

Event Arguments

Property	Description
input	Raw user input
original	Original entry which we received from the database
storageEntry	Entry object prepared to be stored into the database
entry	Entry object which was stored
model	Model this entry belongs to

How to Subscribe to This Event?

onEntryCreateFromError

This event is triggered on entry create from error.

Event Arguments

Property	Description
input	Raw user input
original	Original entry
entry	Entry object which was going to be stored
model	Model this entry belongs to
error	thrown error

How to Subscribe to This Event?

onEntryBeforeUpdate

This event is triggered before an entry is changed and stored into the database.

Event Arguments

Property	Description
input	Raw user input
original	Original entry which we received from the database
entry	Entry object which is going to be stored
model	Model this entry belongs to

How to Subscribe to This Event?

onEntryAfterUpdate

This event is triggered after an entry is changed and stored into the database.

Event Arguments

Property	Description
input	Raw user input
original	Original entry which we received from the database
storageEntry	Entry object prepared to be stored into the database
entry	Entry object which was stored
model	Model this entry belongs to

How to Subscribe to This Event?

onEntryUpdateError

This event is triggered on entry update error.

Event Arguments

Property	Description
input	Raw user input
original	Original entry
entry	Entry object which was going to be stored
model	Model this entry belongs to
error	thrown error

How to Subscribe to This Event?

onEntryBeforeDelete

This event is triggered before all entry revisions are deleted from the database.

Event Arguments

Property	Description
entry	Entry object which is going to be deleted
model	Model this entry belongs to

How to Subscribe to This Event?

onEntryAfterDelete

This event is triggered after all entry revisions are deleted from the database.

Event Arguments

Property	Description
entry	Entry object which is going to be deleted
model	Model this entry belongs to

How to Subscribe to This Event?

onEntryDeleteError

This event is triggered on entry delete error.

Event Arguments

Property	Description
entry	Entry object which was going to be deleted
model	Model this entry belongs to
error	thrown error

How to Subscribe to This Event?

onEntryRevisionBeforeDelete

This event is triggered before an entry revision is deleted from the database.

Event Arguments

Property	Description
entry	Entry object which is going to be deleted
model	Model this entry belongs to

How to Subscribe to This Event?

onEntryRevisionAfterDelete

This event is triggered after an entry revision is deleted from the database.

Event Arguments

Property	Description
entry	Entry object which is going to be deleted
model	Model this entry belongs to

How to Subscribe to This Event?

onEntryRevisionDeleteError

This event is triggered on entry delete error.

Event Arguments

Property	Description
entry	Entry revision which was going to be deleted
model	Model this entry belongs to
error	thrown error

How to Subscribe to This Event?

onEntryBeforePublish

This event is triggered before an entry is published.

Event Arguments

Property	Description
entry	Entry object which is going to be published
model	Model this entry belongs to

How to Subscribe to This Event?

onEntryAfterPublish

This event is triggered after an entry is published.

Event Arguments

Property	Description
entry	Entry object which is going to be published
model	Model this entry belongs to

How to Subscribe to This Event?

onEntryPublishError

This event is triggered on entry publishing error.

Event Arguments

Property	Description
entry	Entry revision which was going to be published
model	Model this entry belongs to
error	thrown error

How to Subscribe to This Event?

onEntryBeforeUnpublish

This event is triggered before an entry is unpublished.

Event Arguments

Property	Description
entry	Entry object which is going to be unpublished
model	Model this entry belongs to

How to Subscribe to This Event?

onEntryAfterUnpublish

This event is triggered after an entry is unpublished.

Event Arguments

Property	Description
entry	Entry object which is going to be unpublished
model	Model this entry belongs to

How to Subscribe to This Event?

onEntryUnpublishError

This event is triggered on entry unpublishing error.

Event Arguments

Property	Description
entry	Entry revision which was going to be unpublished
model	Model this entry belongs to
error	thrown error

How to Subscribe to This Event?

Please, be aware that you can change what ever you want on the object before it is stored into the database, so be careful with changing the data.

Registering Lifecycle Event Subscriptions

System Lifecycle Events

For the subscriptions (your code) to be run, you must register it in the createHandler in the api/code/graphql/src/index.ts file.

api/code/graphql/src/index.ts

Group, Model and Entries Lifecycle Events

For the subscriptions (your code) to be run, you must register it in the createHandler in the api/code/headlessCMS/src/index.ts file.

api/code/headlessCMS/src/index.ts

Please be aware that the order of subscribing does matter: if you want some event subscription to be executed before some other one, add it first.