PREFILL_KEY

The vendor-extension key a driving property carries to declare that picking it fills OTHER fields of the same form: 'x-openregister-prefill'.

Where EXTENDS_FORM_KEY ADDS fields the schema could not enumerate, this one fills fields the schema already declares. A case type knows the status a case of its kind starts in and who normally handles it, so the person filing one should not have to retype either.

import { PREFILL_KEY } from '@conduction/nextcloud-vue'

const declaration = schema.properties.caseType[PREFILL_KEY]
// { fields: { title: 'title', status: 'initialStatus', assignee: 'defaultAssignee' } }

fields reads as { targetProperty: sourceProperty }, resolved against the chosen record. Two rules keep it safe: only an EMPTY target is written, so a value someone typed survives; and it runs in create mode only, because in edit mode a blank field is a decision someone already made about an existing record.

See fields the data decides for the sibling mechanism, and CnFormDialog for the dialog behaviour both drive.