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Session: Deleting Entities
Entities can be marked for deletion by using the delete() method, but will not be removed from the server until saveChanges() is called.
Syntax
session.delete(entity);
session.delete(id, [changeVector]);| Parameters | ||
|---|---|---|
| entity or id | object or string | instance of the entity to delete or the entity ID |
| changeVector | string | a change vector to use for concurrency checks |
Example I
const employee = await session.load("employees/1");
session.delete(employee);
await session.saveChanges();Concurrency on Delete
If useOptimisticConcurrency is set to true (default false), the delete() method will use loaded employees/1 change vector for concurrency check and might throw ConcurrencyException.
Example II
session.delete("employees/1");
await session.saveChanges();Concurrency on Delete
In this example, the delete() method will not do any change vector based concurrency checks because the change vector for employees/1 is unknown.
Information
If entity is not tracked by session, then executing
session.delete("employees/1");is equal to doing
session.advanced.defer(new DeleteCommandData("employees/1", null));Change Vector in DeleteCommandData
In this sample the change vector is null - this means that there will be no concurrency checks. A non-null and valid change vector value will trigger a concurrency check.
You can read more about defer operations here.
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