I have an array of values to update with existing array. I tried with $set it throws a error. If I have an array of values to update it should update matching item in the array.
1.If I have following documents in a collection
table
[
{
"id": 1,
"name": "Fresh Mart",
"products": [
{
"name": "Onion",
"qty": 10,
"price": "85"
},
{
"name": "Tomato",
"qty": 10,
"price": "85"
}
]
},
{
"id": 2,
"name": "Alfred super market",
"products": [
{
"name": "Onion",
"qty": 10,
"price": "85"
},
{
"name": "Tomato",
"qty": 10,
"price": "85"
}
]
}
]
Following query updates one product in first document:
Query
db.collection.update({
"$and": [
{
id: 1
},
{
"products.name": "Onion"
}
]
},
{
"$set": {
"products.name": "Onion Updated"
}
})
I tried to update both products in the first document with following query:
db.collection.update({
"$and": [
{
id: 1
},
{
"products.name": [ "Onion", "Tomato" ]
}
]
},
{
"$set": {
"products.name": "Onion Updated"
}
})
db.collection.update({
id: 1
},
{
"$addToSet": {
"products": {
"$each": [
{
"name": "Onion Updated",
"qty": 10,
"price": "85"
},
{
"name": "Tomato Updated",
"qty": 10,
"price": "85"
}
]
}
}
})
I used $addToSet it will not allow the duplicates. Is possible to replace existing value with $addToSet
but it didn't update the document.
This answer is the dynamic approach of this answer https://stackoverflow.com/a/49870042/8987128
let id = 1;
let updateName = [
{
oldName: "Onion",
newName: "Onion Updated"
},
{
oldName: "Tomato",
newName: "Tomato Updated"
},
];
arrayFilters and set conditionslet arrayFilters = [];
let set = {};
updateName.forEach((v, i) => {
arrayFilters.push({ ["p"+i]: v.oldName });
set["products.$[p"+i+"].name"] = v.newName;
});
db.collection.update(
{ id: id },
{ $set: set },
{ arrayFilters: arrayFilters }
)