db.Tasks.aggregate([ {
$lookup:
{
from: "Userdata",
localField: "customer_id",
foreignField: "_id",
as: "userdetails"
}
} ]
here i get the empty array of userdetails .
please check i gave the response below.
response:
[
{
"_id": "5a6ecde19f3a0d31f4cd5b5e",
"executive_id": "5a6ec6879a3e3406f8f7d70b",
"customer_id": "5a5495b1a03790158019a7d5",
"task_completed": false,
"__v": 0,
"userdeatails": []
}
,
{
"_id": "5a6ecdf29f3a0d31f4cd5b5f",
"executive_id": "5a6ec6879a3e3406f8f7d70b",
"customer_id": "5a5495b1a03790158019a7d5",
"task_completed": false,
"__v": 0,
"userdeatails": []
}
,
{
"_id": "5a6ece0d9f3a0d31f4cd5b60",
"executive_id": "5a6ec6879a3e3406f8f7d70b",
"customer_id": "5a67055d611e836db9078ca3",
"task_completed": false,
"__v": 0,
"userdeatails": []
}
,
{
"_id": "5a6ed8829f3a0d31f4cd5b61",
"executive_id": "5a6ec822c2eee725f8282b3c",
"customer_id": "5a67055d611e836db9078ca3",
"task_completed": false,
"__v": 0,
"userdeatails": []
}
]