comapare array of id in and get value through lookup mongoDB - node.js

Question

my collection Stucture is like below:
{"_id" : ObjectId("5aec2ce5020ba15d2fb2665a"),
"password" : "e10adc3949ba59abbe56e057f20f883e",
"unique_id" : 22,
"first_name" : "Foram",
"last_name" : "Test ",
"country_phone_code" : "+61",
"email" : "a#a.com",
"phone" : "1231231231",
"device_type" : "android",
"admintypeid" : ObjectId("5a9f9b55b9e8fa66f9b934c0"),
"vehicle_detail" : [
{
"service_name" : "You",
"_id" : ObjectId("5aec2d08020ba15d2fb2665c"),
"name" : "Qee",
"plate_no" : "Qwe111",
"model" : "Qee",
"color" : "Blue",
"passing_year" : "2005",
"service_type" : [
ObjectId("5a9f9c53b9e8fa66f9b934c1")
],
"admin_type_id" : ObjectId("5a9f9b55b9e8fa66f9b934c0"),
"is_selected" : true,
"pictureData" : "vehicle_images/5aec2d08020ba15d2fb2665cWjyP.jpg"
},
{
"pictureData" : "vehicle_images/5aec35e00efc106080e14ec7y2tO.jpg",
"is_selected" : false,
"admin_type_id" : ObjectId("5a9f9b55b9e8fa66f9b934c0"),
"service_type" : [
ObjectId("5a9f9c53b9e8fa66f9b934c1"),
ObjectId("5ac954b7075e16583dc3311f")
],
"passing_year" : "2018",
"color" : "No",
"model" : "Bcs",
"plate_no" : "12112",
"name" : "Bcs",
"_id" : ObjectId("5aec35e00efc106080e14ec7"),
"service_name" : "You"
}
],
"service_type" : [
ObjectId("5a9f9c53b9e8fa66f9b934c1")
],
"is_vehicle_document_uploaded" : true,
"is_trip" : [],
"__v" : 14
}
i want to campare ids in my service_type array which is in vehicle_detail array
to another collection named city_types than from that i have to comapare typid of city_types collection to tyes collection and get value of name from type collection
my city_type collection would be something like below
{
"_id" : ObjectId("5a9f9c53b9e8fa66f9b934c1"),
"countryid" : ObjectId("5abb275fd20731597cc01229"),
"cityid" : ObjectId("5abb27cbd20731597cc0122a"),
"typeid" : ObjectId("5a9f9b55b9e8fa66f9b934c0")
"__v" : 0}
containing type_id
and my types collection is like below
{
"_id" : ObjectId("5a9f9b55b9e8fa66f9b934c0"),
"typename" : "You",
"description" : "KARRU You",
"__v" : 0,
"main_type" : 0
}
what i want it name of type
from id
i have used code below:
exports.get_provider_vehicle_list = function (req, res, next) {
var mongoose = require('mongoose');
var Schema = mongoose.Types.ObjectId;
var condition = {$match: {"_id": Schema(req.body.provider_id)}};
var vunwind = {$unwind: "$vehicle_detail"}
var lookup = {
$lookup:
{
from: "types",
localField: "vehicle_detail.admin_type_id",
foreignField: "_id",
as: "type_detail"
}
};
var unwind = {$unwind: {
path: "$type_detail",
preserveNullAndEmptyArrays: true
}
};
var group = {$group: {
_id: null,
"vehicle_detail": {$push: {
is_selected: "$vehicle_detail.is_selected",
admin_type_id: "$vehicle_detail.admin_type_id",
service_type: "$vehicle_detail.service_type",
passing_year: "$vehicle_detail.passing_year",
color: "$vehicle_detail.color",
model: "$vehicle_detail.model",
plate_no: "$vehicle_detail.plate_no",
name: "$vehicle_detail.name",
_id: "$vehicle_detail._id",
type_image_url: '$type_detail.type_image_url',
service_name:"$vehicle_detail.service_name",
pictureData:"$vehicle_detail.pictureData"
}}
}
}
Provider.aggregate([condition, vunwind, lookup, unwind, group], function (err, provider) {
if (err || provider.length == 0) {
res.json({success: true, vehicle_list: []})
} else {
res.json({success: true, vehicle_list: provider[0].vehicle_detail})
}
})
};
and my res is like below:
{
"success": true,
"vehicle_list": [
{
"is_selected": true,
"admin_type_id": "5a9f9b55b9e8fa66f9b934c0",
"service_type": [
"5a9f9c53b9e8fa66f9b934c1",
"5ac954b7075e16583dc3311f"
],
"passing_year": "2005",
"color": "Blue",
"model": "Qee",
"plate_no": "Qwe111",
"name": "Qee",
"_id": "5aec2d08020ba15d2fb2665c",
"type_image_url": "service_type_images/5a9f9b55b9e8fa66f9b934c0mjYA.png",
"service_name": "You",
"pictureData": "vehicle_images/5aec2d08020ba15d2fb2665cWjyP.jpg"
}
]
}
and res i want is below
{
"success": true,
"vehicle_list": [
{
"is_selected": true,
"admin_type_id": "5a9f9b55b9e8fa66f9b934c0",
"service_type": [
"5a9f9c53b9e8fa66f9b934c1",
"5ac954b7075e16583dc3311f"
],
"passing_year": "2005",
"color": "Blue",
"model": "Qee",
"plate_no": "Qwe111",
"name": "Qee",
"_id": "5aec2d08020ba15d2fb2665c",
"type_image_url": "service_type_images/5a9f9b55b9e8fa66f9b934c0mjYA.png",
"service_type_name": [
"You"
],
"service_name": "You",
"pictureData": "vehicle_images/5aec2d08020ba15d2fb2665cWjyP.jpg"
}
]
}

Answer 1

please check.
db.getCollection('vehicle').aggregate([
{
$unwind: {
path: '$vehicle_detail',
preserveNullAndEmptyArrays: true,
},
},
{
$unwind: {
path: '$vehicle_detail.service_type',
preserveNullAndEmptyArrays: true,
},
},
{
$lookup: {
from: 'city_type',
localField: 'vehicle_detail.service_type',
foreignField: '_id',
as: 'city_type',
},
},
{
$unwind: {
path: '$city_type',
preserveNullAndEmptyArrays: true,
},
},
{
$lookup: {
from: 'types',
localField: 'city_type.typeid',
foreignField: '_id',
as: 'types',
},
},
{
$unwind: {
path: '$types',
preserveNullAndEmptyArrays: false,
},
},
{
$group: {
_id: '$_id',
first_name: { $first: 1 },
last_name: { $first: 1 },
types: { $first: '$types' },
},
},
])
Result
{
"_id" : ObjectId("5aec2ce5020ba15d2fb2665a"),
"first_name" : 1.0,
"last_name" : 1.0,
"types" : {
"_id" : ObjectId("5a9f9b55b9e8fa66f9b934c0"),
"typename" : "You",
"description" : "KARRU You",
"__v" : 0,
"main_type" : 0
}
}
Note : You can added fields in group which you need.

Answer 2

I am sending what I understood from your explanation. I hope it helps.
Some points:
I changed your objects city_types and types to an array, since you said Collections;
I link the id to match Vehicle->city->types
function ObjectId(id){
return id;
}
var obj = {"_id" : ObjectId("5aec2ce5020ba15d2fb2665a"),
"password" : "e10adc3949ba59abbe56e057f20f883e",
"unique_id" : 22,
"first_name" : "Foram",
"last_name" : "Test ",
"country_phone_code" : "+61",
"email" : "a#a.com",
"phone" : "1231231231",
"device_type" : "android",
"admintypeid" : ObjectId("5a9f9b55b9e8fa66f9b934c0"),
"vehicle_detail" : [
{
"service_name" : "Service 1",
"_id" : ObjectId("5aec2d08020ba15d2fb2665c"),
"name" : "Qee",
"plate_no" : "Qwe111",
"model" : "Qee",
"color" : "Blue",
"passing_year" : "2005",
"service_type" : [
ObjectId("5a9f9c53b9e8fa66f9b934c1")
],
"admin_type_id" : ObjectId("5a9f9b55b9e8fa66f9b934c0"),
"is_selected" : true,
"pictureData" : "vehicle_images/5aec2d08020ba15d2fb2665cWjyP.jpg"
},
{
"pictureData" : "vehicle_images/5aec35e00efc106080e14ec7y2tO.jpg",
"is_selected" : false,
"admin_type_id" : ObjectId("5a9f9b55b9e8fa66f9b934c0"),
"service_type" : [
ObjectId("5a9f9c53b9e8fa66f9b934c1"),
ObjectId("5ac954b7075e16583dc3311f")
],
"passing_year" : "2018",
"color" : "No",
"model" : "Bcs",
"plate_no" : "12112",
"name" : "Bcs",
"_id" : ObjectId("5aec35e00efc106080e14ec7"),
"service_name" : "Service 2"
}
],
"service_type" : [
ObjectId("5a9f9c53b9e8fa66f9b934c1")
],
"is_vehicle_document_uploaded" : true,
"is_trip" : [],
"__v" : 14
};
var city_types = [{
"_id" : ObjectId("5aec2d08020ba15d2fb2665c"),
"countryid" : ObjectId("5abb275fd20731597cc01229"),
"cityid" : ObjectId("5abb27cbd20731597cc0122a"),
"typeid" : ObjectId("5a9f9b55b9e8fa66f9b934c0"),
"__v" : 0
}];
var types = [{
"_id" : ObjectId("5a9f9b55b9e8fa66f9b934c0"),
"typename" : "You",
"description" : "KARRU You",
"__v" : 0,
"main_type" : 0
}];
function print() {
//iterate over vehicle_detail
obj.vehicle_detail.forEach((vehicle)=>{
console.log("vehicle="+ vehicle._id);
//iterate over cities type
city_types.forEach((city)=> {
console.log("city="+ city._id);
if (city._id == vehicle._id) {
//iterate over types
types.forEach((type)=> {
console.log("type="+ type._id);
if (city.typeid == type._id) {
console.log("Type Name: "+type.typename);
}
})
}
})
});
}
print();
The output of the program is:
>node index4.js
vehicle=5aec2d08020ba15d2fb2665c
city=5aec2d08020ba15d2fb2665c
type=5a9f9b55b9e8fa66f9b934c0
Type Name: You
vehicle=5aec35e00efc106080e14ec7
city=5aec2d08020ba15d2fb2665c