IndexDefinition :: noEmpty - Not storing empty keys or attributes
The option indicates, that empty key values are not accepted in the index. A key value is considered as empty, when all its key components contain empty values.
When trying to store instances having empty values for not-empty keys or not-empty attributes, storing the instance in the index is suppressed, but no error is thrown. Thus, the option acts as a sort of filter when maintaining the index.
When the option is set for an owning collection, instances with empty attributes for key component values cannot be created.
Return value: Success ( bool )
The value is true when the function was executed successfully. Otherwise the value is set to false .
Implementation details
bool
IndexDefinition :: noEmpty ( )
If the function is not called with a valid index definition it throws an exception.