Having, for example, a collection named test
and the following document is inside:
{
"_id" : ObjectId("5692ac4562c824cc5167379f"),
"list" : [
{
"name" : "elem1",
"type" : 1
},
{
"name" : "elem2",
"type" : 2
},
{
"name" : "elem3",
"type" : 1
},
{
"name" : "elem4",
"type" : 3
},
{
"name" : "elem4",
"type" : 2
}
]
}
Let's say I would like to retrieve a list of only those subdocuments inside list
that match:
type = 2
.
I've tried the following query:
db.getCollection('test').find({
'_id': ObjectId("5692ac4562c824cc5167379f"),
'list.type': 1
})
But the result I get contains every subdocument inside list
, and I guess this is because inside list
there are at least one document which's type equals 1.
Instead of that, the result I am interested to obtain would be every subdocument inside list
that matches 'list.type': 1
:
{
"_id" : ObjectId("5692ac4562c824cc5167379f"),
"list" : [
{
"name" : "elem1",
"type" : 1
},
{
"name" : "elem3",
"type" : 1
}
]
}
...so $
and $elemMatch
is not what I am really looking for as they return just the first matching element.
Anyone knows how to achieve what I am looking for?