Saving multiple documents at once - Mongoose.js

Question

user.save(function (err){
    if(err){
        throw err;
    }else{
        admin.save(function (err){
            if(err){
                throw err;
            }else{
                res.redirect('/home');
            }
       });
    }
});

This doesn't seem to work. Any suggestions on how to save multiple documents at once? Are there any other modules I could use except for mongoose to save them all? Thank you.

I also tried this:

user.save(function (err){
     if(err)
        throw err;
     next();
});
admin.save(function (err){
     if(err)
        throw err;
     res.redirect('/home');
});

But that didn't work either! Thanks again for your help

Answer 1

app.post('/homeUser', function (req, res, next) {
            user.findOne({'accountOwner': req.user.userdata.username}, function (err, user){
                if(err)
                    throw err;
                if(user){
                    console.log('user found');
                    user.userdata.username = req.body.newUserName; // I have some other variables as well but they don't matter
                    user.save(function (err){
                        if(err)
                            throw err;
                        res.redirect('/home');
                    });
                } else if(!user) {
                    console.log('new user');
                    var newUser = new user();
                    //setting up some values for the newUser and some for the req.user
                    newUser.save(function (err){
                        if(err){
                            throw err;
                        }else{
                            req.user.save(function (err){ // the problem is here
                                if(err){
                                    throw err;
                                }else{
                                    res.redirect('/home');
                                }
                           });
                        }
                    });
                }
            });
    }

The error is at else{ req.user.save(function (err){ or at least at that line. (sorry if there are any spelling errors, I wrote this code just now, because I'm not using the computer for coding, but this is pretty much the code (except for some semicolons and curly brackets!))