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{
"_id": ObjectId("5c88c7d72db68f5597065063"),
"array": [
{
"a": "a1",
"b": {
"c": "c1"
}
},
{
"a": "a2",
"b": {
"c": "c2"
}
}
]
}
{
"_id": ObjectId("5c88c7d72db68f5597065063"),
"array": [
{
"a": "a1",
"c": "c1"
},
{
"a": "a2",
"c": "c2"
}
]
}
db.test_alias.aggregate({"$project":{"array.a":1, "array.c":"$array.b.c"}})
{
"_id": ObjectId("5c88c7d72db68f5597065063"),
"array": [
{
"a": "a1",
"c": [
"c1",
"c2"
]
},
{
"a": "a2",
"c": [
"c1",
"c2"
]
}
]
}