MongoDB update :- update multiple objects nested inside array (in multiple documents) - mongodb

Question

My collection is as follows :
{
"_id" : "",
"team" : "avenger",
"persons" : [
{
"name" : "ABC",
"class" : "10",
"is_new" : true
},
{
"name" : "JHK",
"class" : "12",
"is_new" : true
},
{
"name" : "BNH",
"class" : "10",
"is_new" : true
}
]
},
{
"_id" : "",
"team" : "adrenaline",
"persons" : [
{
"name" : "HTU",
"class" : "11",
"is_new" : true
},
{
"name" : "NVG",
"class" : "10",
"is_new" : true
},
{
"name" : "SED",
"class" : "8",
"is_new" : true
}
]
}
My Goal is to find for all such documents which contain such nested objects in "persons" where "class" is "10" and update "is_new" field to "false"
I am using mongoose update with "multi" set to true
Query :
{
persons: { $elemMatch: { class: "10" } }
}
Options:
{
multi : true
}
Update :
First one I have tried is :
{
$set : {
"persons.$.is_new" : false
}
}
Second one is :
{
$set : {
"persons.$[].is_new" : false
}
}
The issue is : using $ in update operation updates only first match in the "persons" array for all matched documents.
If I use $[], it updates all the objects of "persons" array in the matched documents.
Workaround can be to use a loop for update operation but i believe that should not be the ideal case.
I see nothing in the docs, though have found people reporting this update operation issue.
Is this can't be done using a single query ?? Is looping through documents my only option ?

Answer 1

You need to set the filtered positional operator $[<identifier>] identifier
Model.update(
{ "persons": { "$elemMatch": { "class": "10" }}},
{ "$set" : { "persons.$[e].is_new" : false }},
{ "arrayFilters": [{ "e.class": "10" }], "multi" : true }
)