# Admin user full
use admin
db.createUser({user:"admin", pwd:"admin", roles: ["userAdminAnyDatabase", "clusterAdmin", "dbAdminAnyDatabase"]})

# list all dbs users
db.system.users.find()

# Create user, don't forget to use the correct database
use <db_name>
db.createUser({user:"root", pwd:"root", roles: ["readWrite"]})

# Create use in another database:
use madbtest
db.createUser({user:"admin", pwd:"vIhVPwy81sdf5fPt3a2", roles: [{role: "readWrite" , db: "madbtest"}]})

# udpate pwd
db.updateUser("username", {pwd: ""})

# mongoshell get schema collection 
# Source: https://medium.com/@ahsan.ayaz/how-to-find-schema-of-a-collection-in-mongodb-d9a91839d992

function printSchema(obj, indent) {
    for (var key in obj) {
        if(typeof obj[key] != "function"){     //we don't want to print functions
            var specificDataTypes=[Date,Array];    //specify the specific data types you want to check
            var type = typeof obj[key];
            for(var i in specificDataTypes){       // looping over [Date,Array]
                if(obj[key] instanceof specificDataTypes[i]){      //if the current property is instance of the DataType
                        type = specificDataTypes[i].name;    //get its name
                        break;
                }
            }
            print(indent, key, type) ;    //print to console (e.g roles object is_Array)
            if (typeof obj[key] == "object") {             //if current property is of object type, print its sub properties too
                printSchema(obj[key], indent + "\t");
            }
        }
    }
};