Update array content within another array that don't have key - arrays

Question

I have mongoDB content as below:
[
{
"_id":{
"$oid":"57c6699711bd6a0976cabe8a"
},
"ID":"1111",
"FullName":"AAA",
"Category":[
{
"CategoryId":{
"$oid":"57c66ebedcba0f63c1ceea51"
},
"_id":{
"$oid":"57e38a8ad190ea1100649798"
},
"Value":[
{
"Name":""
}
]
},
{
"CategoryId":{
"$oid":"57c3df061eb1e59d3959cc40"
},
"_id":{
"$oid":"57e38a8ad190ea1100649797"
},
"Value":[
[
"111",
"XXXX",
"2005"
],
[
"1212",
"YYYY",
"2000"
],
[
"232323",
"ZZZZZ",
"1999"
]
]
}
]
},
{
"_id":{
"$oid":"57c6699711bd6a0976cabe8a"
},
"ID":"1111",
"FullName":"BBB",
"Category":[
{
"CategoryId":{
"$oid":"57c66ebedcba0f63c1ceea51"
},
"_id":{
"$oid":"57e38a8ad190ea1100649798"
},
"Value":[
{
"Name":""
}
]
},
{
"CategoryId":{
"$oid":"57c3df061eb1e59d3959cc40"
},
"_id":{
"$oid":"57e38a8ad190ea1100649797"
},
"Value":[
[
"4444",
"XXXX",
"2005"
],
[
"7777",
"GGGG",
"2000"
],
[
"8888",
"ZZZZZ",
"1999"
]
]
}
]
}
]
Here I have an array named 'Category' where it contains objects with different category id.
I need to
select a particular category id - '57c3df061eb1e59d3959cc40'
From the above selected Category, we get 'Value' array
From Value array need to find if the second value is equal to 'ZZZZZ' ie. value[1] == 'ZZZZZ'
And now, update the matched value arrays with a new value at the end
Eg:
[
"232323",
"ZZZZZ",
"1999"
]
should be updated to
[
"232323",
"ZZZZZ",
"1999",
"update1"
]
and
[
"8888",
"ZZZZZ",
"1999"
]
should be updated to
[
"8888",
"ZZZZZ",
"1999",
"update1"
]
I have tried as below:
resume.update({
"Category.CategoryId": new ObjectId('57c3df191eb1e59d3959cc43'),
"Category.Value.$.1": 'ZZZZZ'
},
{"$set": {"Category.Value.$.3": "update1"}
}, function(err, resData){
res.send(resData);
});
But, nothing gets updated. Its there any way to get this work. Please help to update the inner array.
Thanks in advance.

Answer 1

Your goal is not possible at the moment since you need to update two positional elements.
There is a JIRA trackable for the sort of behaviour you want here: https://jira.mongodb.org/browse/SERVER-831
It's a problem since you need to match two elements positions:
the Category element with the matched CategoryId
the Value element in the Value array of arrays
If one of these wouldn't be an array it would have been possible.
Anyway, Your update try above was wrong. IF this feature was possible (and it is not!!!) it would have been something like this:
db.resume.update(
{
Category: {
$elemMatch: {
CategoryId: ObjectId('57c3df061eb1e59d3959cc40'),
Value: {
$elemMatch: {
'1': 'ZZZZZ'
}
}
}
}
},
{
$push: {
'Category.$.Value.$': 'update1'
}
}
)
The positional $ operator should be used during the update and not the find like you did, and it will update the first element that matched the query.
Doing the above will return the error:
Too many positional (i.e. '$') elements found in path 'Category.$.Value.$'
Because of the missing feature I explained at the top.
So, currently (version 3.2) you will not be able to do this unless you change your schema.