update nested array element value in node js mongoDB [duplicate] - arrays

Question

This question already has answers here:
How to Update Multiple Array Elements in mongodb
(16 answers)
Closed 6 years ago.
Hi i am new in nodejs i need to update a value in nested array using _id of document my database document is look like this..
"complaints" : [
{
"complaint" : "head light is not working",
"complaintid" : ObjectId("57205219a56d2b8c0f9274a4"),
"_id" : ObjectId("57454c9249218eb40c1c0d1f"),
"labour" : 350,
"partCost" : 0,
"part" : [
{
"id" : ObjectId("56f12eaab915bd9800272ed7"),
"estimate" : 450,
"partname" : "clutch",
"_id" : ObjectId("57454cef49218eb40c1c0d25"),
"quantity" : 0,
"qrcodes" : []
},
{
"id" : ObjectId("56f12eaab915bd9800272ed7"),
"estimate" : 450,
"partname" : "rear tyre",
"_id" : ObjectId("57454cef49218eb40c1c0d24"),
"quantity" : 0,
"qrcodes" : []
}
],
"acceptance" : true,
"inspection" : false,
"color" : "#8929A9",
"status" : "APPROVED",
"estimate" : 1200,
"solution" : "HEAD LIGHT CHANGE",
"problems" : "HEAD LIGHT IS NOT WORKING"
},
i need to update quantity value of part array exist inside the part array using _id of part array
i am trying this but its not working what should i do for update this value...
var partdata = req.payload.parts;
for(var k = 0; k< partdata.length ; k++ ){
CPS.update({
'complaints.part._id' : partdata[k].partid
}, {
"$inc" : {
'complaints.part.$.quantity' : partdata[k].quantity
}
}).exec
(function(err,temp) {
if(err){
res(err).code(500);
}else{
console.log(temp);
}
});
}

Answer 1

MongoDB doesn't support matching into more than one level of an array.
Consider altering your document model so each document represents an
operation, with information common to a set of operations duplicated
in the operation documents.
Following is not the solution for your case.
But in-case you know the index then you could do something like this:
Assume a sample document like:
{
"_id" : ObjectId("57454c9249218eb40c1c0d1f"),
"part" : [{ "quantity" : 111 }, { "quantity" : 222 }]
}
Then this query should work.
db.test.update({ "_id" : ObjectId("57454c9249218eb40c1c0d1f") }, { "$set" : { "part.1.quantity" : 999 } })
Document will get modified as follows :
{
"_id" : ObjectId("57454c9249218eb40c1c0d1f"),
"array" : [{ "quantity" : 222 }, { "quantity" : 999 }]
}
Update: You can try following way of doing the update. But its not recommended way of doing probably you need to restructure your schema.
db.test.aggregate([
{ "$unwind": "$complaints" },
{ "$unwind": "$complaints.part" },
{ "$project":
{
_id: "$complaints.part._id",
partqty: "$complaints.part.quantity"
}
},
]);
This should return as follows:
{
"_id" : ObjectId("57454cef49218eb40c1c0d25"),
"partqty" : 111
}
{
"_id" : ObjectId("57454cef49218eb40c1c0d24"),
"partqty" : 222
}
Now you can use this information to update, e.g
var cur = db.test.aggregate([
{ "$unwind": "$complaints" },
{ "$unwind": "$complaints.part" },
{ "$project":
{
_id: "$complaints.part._id",
partqty: "$complaints.part.quantity"
}
},
]);
while (cur.hasNext()) {
var doc = cur.next();
//Note the index should be know again :|
db.test.update({ "complaints.part._id": ObjectId("57454cef49218eb40c1c0d25") },
{ "$set": { "complaints.$.part.1.quantity": 55 }},
{ "multi": true})
}