Displaying friends list using node.js and MongoDB - node.js

Question

I am new to a node.js and I am trying to use this application https://github.com/knoldus/Node.js_UserLogin_Template
However, I cannot see friends list. I do not know what is the problem with ?
Could you help me with issue ?
Thanks

Answer 1

//Your user schema is looks like that
const userSchema = new Schema({
name: {
type: String,
required: true
},
email: {
type: String,
//unique: true,
required: true
},
password: {
type: String,
required: true
},
friends: {
type: Array // here you can put your friends collections _id like this [ObjectId("id1"), ObjectId("id2")]
}
});
const FriendSchema = new Schema({
user_from: {
type: Schema.Types.ObjectId,
ref: "users",
required: true
},
user_to: {
type: Schema.Types.ObjectId,
ref: "users",
required: true
},
is_accepted: {
type: Boolean,
default: false
},
date: {
type: Date,
default: Date.now
}
});
//and your query will look like that --
FriendModel.aggregate([
{
$lookup: {
from: "users", // users collection
localField: "_id", // friends collection id
foreignField: "friends", // friends field in you users collection document
as: "myfriends" //any alias name you can use
}
},
{
$match: { // matching condition for current user's friends from friends collection including current user
$or: [
{ user_to: mongoose.Types.ObjectId(req.user.id) }, // req.user.id referrers to logged in user object id
{ user_from: mongoose.Types.ObjectId(req.user.id) },
]
},
$match: { is_accepted: true} // that condition is for is user accepted friend request or not.
}
,
{ // filtering logged in user from the friend list
$project: {
myfriends: { // myfriends is alias name that you used in $loopup part
$filter: {
input: "$myfriends",
as: "item",
cond: { $ne: [ "$$item._id", mongoose.Types.ObjectId(req.user.id) ] }
}
}
}
}
])