isPresent
available since: 1.0.0
Takes an arbitrary value that could be null and returns whether it is.
Example:
Query:
e.data(d.list(d.expr(e.isPresent(d.string("foo"))), d.expr(e.isPresent(d.null()))))Result:
[
true,
false
]presentOrZero
available since: 1.0.0
Takes an arbitrary value that could be null and returns its zero value in case it is null.
- T
- null
→ TExample:
Query:
e.create(e.tag(d.string("_model")), f.function(["_ref_0"], e.data(m.optional(m.string()))))Result:
[
"gakUZPvNLAeYKvIb",
"nWVgorGwDDYPlOyA"
]Example:
Query:
e.data(d.struct({- valueA: d.expr(e.presentOrZero(e.get({
- scope: "recordA",
}))), - valueB: d.expr(e.presentOrZero(e.get({
- scope: "recordB",
}))),
}))Result:
{
"valueA": "test",
"valueB": ""
}