mongoDB find and update or insert - mongodb

Question

I am using mongoDB and mongoose.
I have the following scheme:
{ "group" :
"items" : [
{
"name": "aaa",
"value": "aaa_value",
"description": "some_text"
},
{
"name": "bbb",
"value": "bbb_value"
"description": "some_text2"
},
{
"name": "ccc",
"value": "ccc_value"
"description": "some_text3"
},
]
}
My function receives a name and a value.
If an item with this name is presented, I want to update the value according to the value parameter (and do not change the description).
If not, I want to add a new item to the array, with the parameter name and value, and a default description.
How can it be done?
Thank you

Answer 1

upsert operation is not possible on embedded array. It has be to 2 step process.
Either you first (try to) remove record and then push it. Or update the record first, and if that fails, then insert it.
First approach: (first delete it)
db.collection.update(
{ _id : ObjectId("xyz")},
{ $pull: {"items.name": "aaa"}}
)
then, insert it:
db.collection.update(
{ _id : ObjectId("xyz")},
{ $push: {"items": {
name : "ddd",
value: "new value",
description: "new description"
}}
)
Second Approach: (first update it)
var result = db.collection.update(
{
_id : ObjectId("xyz"),
"items.name": "aaa")
},
{
$set: {"items.$.name": {name: "new name"}}
}
);
And then, if nothing updates, then insert it.
if(!result.nMatched)
{
db.collection.update(
{
_id: ObjectId("xyz"),
"items.name": {$ne: ObjectId("xyz"}}
},
{
$push: {
items: {
name: "new name",
value: "new value",
description: "new description"
}
}
}
);
}