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ISACTIVE
Use this function to determine if an instance of a specific type is currently active.
ISACTIVE instances [WHERE condition]
Inputs
- instances - instances to search
- condition - optional condition to limit the collection of instances to check
Return type
boolean - TRUE if one of the instances is active, FALSE otherwise
Singletons are always active, so
ISACTIVE<singleton> will always returnTRUE
Examples
Suppose the following data model.
| instance_id | Person.name | Person.Age |
|---|---|---|
| Person_1 | “Bob” | 14 |
| Person_2 | “Jane” | 25 |
| Person_3 | “Mary” | 30 |
| Active Person | Expression | Result | Type | Note |
|---|---|---|---|---|
| None | ISACTIVE Person | FALSE | boolean | |
| Person_1 | ISACTIVE Person | TRUE | boolean | |
| Person_1 | ISACTIVE Person WHERE Person.Age >= 18 | FALSE | boolean | |
| None | ISACTIVE system | TRUE | boolean | |
| None | Person.Age >= 18 | Error | No Person is active | |
| None | ( ISACTIVE Person ) AND Person.Age >= 18 | FALSE | boolean | The expression is evaluated left-to-right and fails on ( ISACTIVE Person ) instead of giving an error |
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