Data not populating in mongoose - node.js

Question

here is my schema
var employee =
{
empCode : { type : String , unique: true , required : true },
firstName : { type : String , required : true },
lastName : { type : String },
email : { type : String },
DOJ :{ type : Date , default: Date.now },
DOB :{ type : Date },
phoneNo : { type : String },
authentication :
{
username : { type : String },
password : { type : String }
},
dsg :
[{
designationID: [{type : mongoose.Schema.ObjectId , ref:'designation'}],
effFrom :{ type : Date , default: Date.now },
effTo : { type : Date }
}],
grd :
{
grade : [{type : mongoose.Schema.ObjectId, ref:'grade'}],
effFrom :{ type : Date , default: Date.now },
effTo : { type : Date }
},
dpt :
{
departmentID : [{type : mongoose.Schema.ObjectId ,ref:'department'}],
effFrom :{ type : Date , default: Date.now },
effTo : { type : Date }
},
manager :
{
managerID : {type : mongoose.Schema.ObjectId , ref:'employee'},
effFrom :{ type : Date , default: Date.now },
effTo : { type : Date }
},
rol :
{
roleID : [{type : mongoose.Schema.ObjectId , ref:'role'}],
effFrom :{ type : Date , default: Date.now },
effTo : { type : Date }
},
status : {type:Boolean}
}
and i wannt to populate like this
empController.prototype.list=function(callback){
objMdlEmp.find()
.populate('designationID')
.populate('grade')
.exec(function(err, records){
if(err){
console.log(err);return;
callback(false , config.msg.SOMTHING_WRONG);
return;
}else {
callback(true , records);
}
})
};
but another document data is not showing,
when i put like this my schema then only its showing , but i need to add effFrom and effTo data also
dsg : [{type : mongoose.Schema.ObjectId , ref:'designation'}]

Answer 1

You cant populate embedded fields in mongoose, but you can use some workarounds
1) Keep your related data in another field like so
var employee = {
grd: {type: mongoose.Schema.ObjectId, ref: 'grade'},
grdData: {
grade: [],
effFrom: {type: Date, default: Date.now},
effTo: {type: Date}
}
};
2) Use plugins like mongoose-deep-populate
objMdlEmp.find().deepPopulate('grd.grade').exec(function (err, records) { ... });