Update nested documents inside array based on condition - mongodb

Question

i have the next document and i have to update promotion object according to promotionId
executing i can update, but this query erases the other products that have no the promotion in the condition:
if i use update many i get Error: the update operation document must contain atomic operators.
Please help me to get the error to update but keeping the products that does not have the promo i am updating.
/* 1 */
db.fulFillmentCenter.update({},[
{
$addFields: {
exclusiveProducts: {
$filter: {
input: "$exclusiveProducts",
as: "product",
cond: {
$eq: [
"$$product.promotion.promotionId",
'promo1'
]
}
}
}
}
},
{$set: { "exclusiveProducts.promotion.description": "multi 2"}}
/* 2 */
{
"_id" : 1,
"_class" : "com.walmart.labsmx.exclusiveproducts.model.FulFillmentCenter",
"minDateDelivery" : 9,
"maxDateDelivery" : 2,
"deliveryCost" : 10.0,
"origin" : "string",
"active" : true,
"exclusiveProducts" : [
{
"_id" : NumberLong(1585867035599),
"upc" : "p1",
"totalStock" : 10,
"availableStock" : 10,
"price" : 0.0,
"origin" : "debe aparece",
"startDate" : ISODate("2020-02-10T02:47:03.472Z"),
"endDate" : ISODate("2020-04-10T02:47:03.472Z"),
"active" : true,
"promotion" : {
"_id" : NumberLong(1585867035613),
"promotionId" : "promo1",
"description" : "string",
"startDate" : ISODate("2020-04-30T17:49:27.205Z"),
"endDate" : ISODate("2020-04-30T17:49:27.205Z"),
"active" : true
}
},
{
"_id" : NumberLong(1585867035642),
"upc" : "p2",
"totalStock" : 10,
"availableStock" : 10,
"price" : 0.0,
"origin" : "no debe aparece",
"startDate" : ISODate("2020-02-10T02:47:03.472Z"),
"endDate" : ISODate("2020-04-10T02:47:03.472Z"),
"active" : false,
"promotion" : {
"_id" : NumberLong(1585867035654),
"promotionId" : "promo1",
"description" : "string",
"startDate" : ISODate("2020-04-30T17:49:27.205Z"),
"endDate" : ISODate("2020-04-30T17:49:27.205Z"),
"active" : true
}
},
{
"_id" : NumberLong(1585867035607),
"upc" : "p3",
"totalStock" : 10,
"availableStock" : 10,
"price" : 0.0,
"origin" : "no debe aparece",
"startDate" : ISODate("2020-02-10T02:47:03.472Z"),
"endDate" : ISODate("2020-03-10T02:47:03.472Z"),
"active" : true,
"promotion" : {
"_id" : NumberLong(1585867035668),
"promotionId" : "promo1",
"description" : "string",
"startDate" : ISODate("2020-04-30T17:49:27.205Z"),
"endDate" : ISODate("2020-04-30T17:49:27.205Z"),
"active" : true
}
},
{
"_id" : NumberLong(1585867035644),
"upc" : "p4",
"totalStock" : 10,
"availableStock" : 10,
"price" : 0.0,
"origin" : "debe aparece",
"startDate" : ISODate("2020-02-10T02:47:03.472Z"),
"endDate" : ISODate("2020-05-10T02:47:03.472Z"),
"active" : true,
"promotion" : {
"_id" : NumberLong(1585867035632),
"promotionId" : "promo1",
"description" : "string",
"startDate" : ISODate("2020-04-30T17:49:27.205Z"),
"endDate" : ISODate("2020-04-30T17:49:27.205Z"),
"active" : true
}
},
{
"_id" : NumberLong(1585867035666),
"upc" : "p5",
"totalStock" : 10,
"availableStock" : 10,
"price" : 0.0,
"origin" : "no debe aparece",
"startDate" : ISODate("2020-05-10T02:47:03.472Z"),
"endDate" : ISODate("2020-07-10T02:47:03.472Z"),
"active" : true,
"promotion" : {
"_id" : NumberLong(1585867035591),
"promotionId" : "promo1",
"description" : "string",
"startDate" : ISODate("2020-04-30T17:49:27.205Z"),
"endDate" : ISODate("2020-04-30T17:49:27.205Z"),
"active" : true
}
},
{
"_id" : NumberLong(1585867035669),
"upc" : "p20",
"totalStock" : 10,
"availableStock" : 10,
"price" : 0.0,
"origin" : "no debe aparece",
"startDate" : ISODate("2020-05-10T02:47:03.472Z"),
"endDate" : ISODate("2020-07-10T02:47:03.472Z"),
"active" : true,
"promotion" : {
"_id" : NumberLong(1585867035661),
"promotionId" : "promo2",
"description" : "string",
"startDate" : ISODate("2020-04-30T17:49:27.205Z"),
"endDate" : ISODate("2020-04-30T17:49:27.205Z"),
"active" : true
}
},
{
"_id" : NumberLong(1585867035643),
"upc" : "p21",
"totalStock" : 10,
"availableStock" : 10,
"price" : 0.0,
"origin" : "no debe aparece",
"startDate" : ISODate("2020-05-10T02:47:03.472Z"),
"endDate" : ISODate("2020-07-10T02:47:03.472Z"),
"active" : true,
"promotion" : {
"_id" : NumberLong(1585867035612),
"promotionId" : "promo3",
"description" : "string",
"startDate" : ISODate("2020-04-30T17:49:27.205Z"),
"endDate" : ISODate("2020-04-30T17:49:27.205Z"),
"active" : true
}
}
],
"exclusiveStores" : [
{
"storeId" : 123,
"origin" : "string"
}
]
}

Answer 1

This update query updates all the nested documents promotion within the array exclusiveProducts. The value of "promotion.description" is modified with the new value "multi 2", where the "promotion.promotionId" = "promo1".
var new_desc = "multi 2";
db.collection.updateMany(
{ "exclusiveProducts.promotion.promotionId": "promo1" },
{ $set: { "exclusiveProducts.$[pr].promotion.description": new_desc } },
{ arrayFilters: [ { "pr.promotion.promotionId": "promo1" } ] }
)