The existing operator returns true if any element in a collection exists (is not deleted).It is commonly used to verify whether a reference or collection still points to at least one valid (non-deleted) object.

existing is especially useful when working with optional roles or objects that may have been deleted during the current transaction

Syntax

collection->existing

How it differs from exists

exists(condition)        Checks if any element satisfies a condition

existing                 Checks if any element still exists (not deleted)

Example

Check if a Customer has any Orders

self.Orders->existing

Returns true if at least one Order exists.