Determining whether a user possesses a specific role

Currently, I am using mongoDb within my express server to store user information in the following structure:

var UserSchema = new Schema({
    username: { type: String, required: true, index: { unique: true } },
    password: { type: String, required: true },
    email: {type: String, required: true ,  index: { unique: true } },
    isActive: {type:Boolean, default:false},
    signUpDate: {type: Date, default: Date.now()},
    roles: [
        {
            type: mongoose.Schema.Types.ObjectId,
            ref: "Role"
        }
    ]
});

The 'Role' schema contains a single field called 'name'.

In order to determine if a user has admin privileges, I currently execute this code:

User.findById(req.SecureUserId).populate('roles').exec((err, user) => {
        if (err) {
            res.status(500).send({ message: err });
            return;
        }
        for(let roles of user.roles){
            if(roles.name === 'admin'){
                next();
                return;
            }
        }

However, I believe there might be a more efficient way to query this information from my database. How can I optimize this process in mongoDB?

Answer №1

To link a single user with their role and check if they have the "admin" role, you can utilize the .aggregate() method along with $match. If the user does not possess the specified role, the aggregation will result in an empty array:

User.aggregate([
    { $match: { _id: req.SecureUserId } },
    {
        $lookup: {
            from: "roles",
            localField: "roles",
            foreignField: "_id",
            as: "roles"
        }
    },
    { $match: { "roles.name": "admin" } }
]).exec((err, user) => {
    if(user.length === 1){
        next();
    }
})

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