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/**
* Tests for the $dateToString expression with the optional 'onNull' parameter.
*/
(function() {
"use strict";
const onNullValue = ISODate("2017-07-04T11:56:02Z");
const coll = db.date_to_string_on_null;
coll.drop();
assert.commandWorked(coll.insert({_id: 0}));
for (let nullishValue of [null, undefined, "$missing"]) {
// Test that the 'onNull' value is returned when the 'date' is nullish.
assert.eq(
[{_id: 0, date: onNullValue}],
coll.aggregate({
$project: {
date: {
$dateToString:
{date: nullishValue, format: "%Y-%m-%d %H:%M:%S", onNull: onNullValue}
}
}
})
.toArray());
// Test that null is returned when the 'timezone' is nullish, regardless of the 'onNull'
// value.
assert.eq([{_id: 0, date: null}],
coll.aggregate({
$project: {
date: {
$dateToString: {
date: "2018-02-06T11:56:02Z",
format: "%Y-%m-%d %H:%M:%S",
timezone: nullishValue,
onNull: onNullValue
}
}
}
})
.toArray());
}
// Test that 'onNull' can be any type, not just an ISODate.
for (let onNullValue of [{}, 5, "Not a date", null, undefined]) {
assert.eq(
[{_id: 0, date: onNullValue}],
coll.aggregate({
$project: {
date: {
$dateToString:
{date: "$missing", format: "%Y-%m-%d %H:%M:%S", onNull: onNullValue}
}
}
})
.toArray());
}
// Test that 'onNull' can be missing, resulting in no output field when used within a $project
// stage.
assert.eq([{_id: 0}],
coll.aggregate({
$project: {
date: {
$dateToString:
{date: "$missing", format: "%Y-%m-%d %H:%M:%S", onNull: "$missing"}
}
}
})
.toArray());
})();
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