$allElementsTrue
The $allElementsTrue operator returns true if all elements in an array evaluate to true.
$allElementsTrue
The $allElementsTrue operator evaluates an array as a set. It returns true if no element in the array has a value of false or equivalent to false (like null, 0, or undefined). If any element evaluates to a value of false or the equivalent, the operator returns false.
Parameters
| Parameter | Description |
|---|---|
array | An array of expressions to evaluate. If the array is empty, $allElementsTrue returns true. |
Examples
Consider this sample document from the stores collection.
{
"_id": "0fcc0bf0-ed18-4ab8-b558-9848e18058f4",
"name": "First Up Consultants | Beverage Shop - Satterfieldmouth",
"location": {
"lat": -89.2384,
"lon": -46.4012
},
"staff": {
"totalStaff": {
"fullTime": 8,
"partTime": 20
}
},
"sales": {
"totalSales": 75670,
"salesByCategory": [
{
"categoryName": "Wine Accessories",
"totalSales": 34440
},
{
"categoryName": "Bitters",
"totalSales": 39496
},
{
"categoryName": "Rum",
"totalSales": 1734
}
]
},
"promotionEvents": [
{
"eventName": "Unbeatable Bargain Bash",
"promotionalDates": {
"startDate": {
"Year": 2024,
"Month": 6,
"Day": 23
},
"endDate": {
"Year": 2024,
"Month": 7,
"Day": 2
}
},
"discounts": [
{
"categoryName": "Whiskey",
"discountPercentage": 7
},
{
"categoryName": "Bitters",
"discountPercentage": 15
},
{
"categoryName": "Brandy",
"discountPercentage": 8
},
{
"categoryName": "Sports Drinks",
"discountPercentage": 22
},
{
"categoryName": "Vodka",
"discountPercentage": 19
}
]
},
{
"eventName": "Steal of a Deal Days",
"promotionalDates": {
"startDate": {
"Year": 2024,
"Month": 9,
"Day": 21
},
"endDate": {
"Year": 2024,
"Month": 9,
"Day": 29
}
},
"discounts": [
{
"categoryName": "Organic Wine",
"discountPercentage": 19
},
{
"categoryName": "White Wine",
"discountPercentage": 20
},
{
"categoryName": "Sparkling Wine",
"discountPercentage": 19
},
{
"categoryName": "Whiskey",
"discountPercentage": 17
},
{
"categoryName": "Vodka",
"discountPercentage": 23
}
]
}
]
}Example 1: Determine if all the discount percentages are higher than zero
This query determines if all the discount percentages in each promotion event are greater than zero.
db.stores.aggregate([
{ $match: {"_id": "2cf3f885-9962-4b67-a172-aa9039e9ae2f"} },
{ $unwind: "$promotionEvents" },
{
$project: {
allDiscountsValid: {
$allElementsTrue: [
{
$map: {
input: "$promotionEvents.discounts.discountPercentage",
as: "discount",
in: { $gt: ["$$discount", 0] }
}
}
]
}
}
}
])This query returns the following result.
[
{
"_id": "2cf3f885-9962-4b67-a172-aa9039e9ae2f",
"allDiscountsValid": true
}
]