update specific element from nested document array mongodb where has two matches - mongodb

Question

I need to update or create if not exist, specific obj,set score.b1 =50 and total=100 where object match curse=5 block=2
{ "_id":"sad445"
"year":2020,
"grade":4,
"seccion":"A",
"id": 100,
"name": "pedro",
"notes":[{"curse":5,
"block":1,
"score":{ "a1": 5,"a2": 10, "a3": 15},
"total" : 50
},{
"curse":5,
"block":2,
"score":{ "b1": 10,"b2": 20, "b3": 30},
"total" : 20
}
]
}
I can update all obj but I need to update or create specific elem from the score and not all. and/or create objs "notes":[{curse, block and score}] if notes is empty notes:[]
notas.UpdateMany(
{"$and":[{"_id":"sad445"},{"notes":{"$elemMatch":{"curse":5,"block":3}}}]},
{"$set":{"updated_at":{"$date":{"$numberLong":"1620322881360"}},
"notes.$.score":{"vvkzo":15,"i2z4i":2,"i2z4i|pm":5},
"notes.$.total":100}},
{"multiple":false})

Answer 1

Demo - https://mongoplayground.net/p/VaE28ujeOPx
Use $ (update)
The positional $ operator identifies an element in an array to update without explicitly specifying the position of the element in the array.
the positional $ operator acts as a placeholder for the first element that matches the query document, and
the array field must appear as part of the query document.
db.collection.update({
"notes": {
"$elemMatch": { "block": 2, "curse": 5 }
}
},
{
$set: { "notes.$.score.b4": 40 }
})
Read upsert: true
Optional. When true, update() either:
Creates a new document if no documents match the query. For more
details see upsert behavior. Updates a single document that matches
the query. If both upsert and multi are true and no documents match
the query, the update operation inserts only a single document.
To avoid multiple upserts, ensure that the query field(s) are uniquely
indexed. See Upsert with Unique Index for an example.
Defaults to false, which does not insert a new document when no match
is found.
Update
Demo - https://mongoplayground.net/p/iQQDyjG2a_B
Use $function
db.collection.update(
{ "_id": "sad445" },
[
{
$set: {
notes: {
$function: {
body: function(notes) {
var record = { curse:5, block:2, score:{ b4:40 } };
if(!notes || !notes.length) { return [record]; } // create new record and return in case of no notes
var updated = false;
for (var i=0; i < notes.length; i++) {
if (notes[i].block == 2 && notes[i].curse == 5) { // check condition for update
updated = true;
notes[i].score.b4=40; break; // update here
}
}
if (!updated) notes.push(record); // if no update push the record in notes array
return notes;
},
args: [
"$notes"
],
lang: "js"
}
}
}
}
]
)

Answer 2

Try to add upsert: true.
Creates a new document if no documents match the query. Updates a single document that matches
the query.
notas.UpdateMany(
{"$and":[{"_id":"sad445"},{"notes":{"$elemMatch":{"curse":5,"block":3}}}]},
{"$set":{"updated_at":{"$date":{"$numberLong":"1620322881360"}},
"notes.$.score":{"vvkzo":15,"i2z4i":2,"i2z4i|pm":5},
"notes.$.total":100}},
{"multiple":false, "upsert":true})