Session: How to Get Entity Change-Vector
The change-vector reflects the cluster-wide point in time where something happened. It includes the unique database ID, node identifier, and the Etag of the document in the specific node.
When a document is downloaded from the server, it contains various metadata information e.g. ID or current change-vector. Current change-vector is stored within the metadata in session and is available for each entity using the getChangeVectorFor() method from the advanced session operations.
Syntax
session.advanced.getChangeVectorFor(entity);
| Parameters |
|
|
| instance |
object |
Instance of an entity for which an Etag will be returned. |
| Return Value |
|
| string |
Returns the current change-vector for an entity. Throws an exception if the instance is not tracked by the session. |
Example
const employee = await session.load("employees/1-A");
const changeVector = session.advanced.getChangeVectorFor(employee);