mongoose populate after another populate - arrays

Question

I have 3 mongo collections.
resource
access
user
the user has a relationship with access and access has a relationship with resource. I want when populate a user all join be done and I see the full resource that user has access them.
I tried this code but was n't expected response
Users.findById(req.params.userId)
.populate({path:'accessID',model:'accesses'})
.populate({path:'accessID.accessLists',model:'resources'})
and this
Users.findById(req.params.userId)
.populate({path:'accessID',model:'accesses'})
.then
(
(user)=>
{
Users.populate(user,{path})
}
)
here is my defections
Resource:
var ResourceSchema =new Schema
({
resource:String
method:
{ type:String,
enum:["GET","PUT","POST","DELETE"]
}
})
Access:
var AccessSchema =new Schema
({
name:String
access_List:
[
{ type: Schema.Types.ObjectId, ref:'resources'}
]
})
User:
var UserSchema = new Schema
({
name:String,
email:String,
accessID:
{ type: Schema.Types.ObjectId, required: true, ref: 'accesses' }
)}
my output like this
{"accessID":
{
"_id": "5cef82d1d2f7e14d3013ac8c",
"accessLists":
[
"5cee8e093defe92b88c1626b",
"5cee8e093defe92b88c1626c",
"5cee8e093defe92b88c1626d",
],
"name": "Admin",
},
"name": "ali"
"email": "ali17#yahoo.com"
}
but I want my output like this:
{
"name": "ali",
"email": "ali17#yahoo.com"
"accessID":
{
"_id": "5cef82d1d2f7e14d3013ac8c",
"accessLists":
[
{
"_id": "5cee8e093defe92b88c1626b",
"resource": "groups",
"method": "POST",
},
{
"_id": "5cee8e093defe92b88c1626c",
"resource": "groups",
"method": "DELETE",
},
{
"_id": "5cee8e093defe92b88c1626d",
"resource": "groups",
"method": "GET",
}
]
"name": "Admin",
}
}

Answer 1

User.findById(req.params.userId)
.populate({path:'accessID',model:'accesses'})
.populate({ path: 'accessID', populate: { path: 'access_List',model:'resources' }})
.exec(function (err, response) {
})
I have tried and its working.
More Help: Example
also, I have tried with aggregation :
db.users.aggregate([
{$match : { _id : ObjectId("5cf00388eae5400e9439b2df")}},
{
$lookup: {
from:"access",
localField:"accessID",
foreignField: "_id",
as:"accessID"
}
},
{ "$unwind": '$accessID'},
{ "$unwind": '$accessID.access_List'},
{
$lookup: {
from:"resources",
localField:"accessID.access_List",
foreignField: "_id",
as:"access_List"
}
},
{
$group : {
_id : {
"_id" : '$_id', "name" : '$name', "email" : '$email',
"accessID" : {"_id" : '$accessID._id', "name": '$accessID.name' }
},
access_List : { $push : { "$arrayElemAt": [ "$access_List", 0 ] } }
}
},
{ $project : {
_id : '$_id._id',
name : '$_id.name',
email : '$_id.email',
accessID : {
_id : '$_id.accessID._id',
name: '$_id.accessID.name',
access_List : '$access_List'
}
}
}
]).pretty()