set-virtualization-code

To set server-side JavaScript for virtual attributes, you apply a patch update via the novadb_cms_update_objects tool, writing your JavaScript code into attribute 1009 with language 0 and variant 0 on a specific branch.

A virtual attribute in NovaDB is an attribute definition marked with isVirtual (attribute 1020). Its value is computed server-side using JavaScript virtualization code stored centrally within the attribute definition.

Updating virtualization code requires a branch ID, object meta with id and typeRef 10, CmsValue entries containing the JavaScript in attribute 1009 with language 0 and variant 0, and an audit comment for the transaction.

Yes, setting virtual attribute code requires targeting a specific NovaDB branch ID. The update must be applied transactionally using the novadb_cms_update_objects tool to ensure changes are audited and stored correctly.

Virtual attribute values may not update if the JavaScript was not written into the correct CmsValue variant. You must target attribute 1009 with language 0 and variant 0, and apply the patch update through novadb_cms_update_objects.

Yes, centralizing derived data logic is the primary use case. By updating the virtualization code on an existing virtual attribute, all subsequent server-side reads will return the newly computed values.