var userSchema = mongoose.Schema ({
    local: {
        username: String,
        email: String,
        gender: String,
        firstName: String,
        lastName: String,
        password: String
    },
    facebook: {
        id: String,
        token: String,
        email:String,
        name: String,
        photo: String
    },
    generalInfo: {
        age: String,
        favoriteDog: String,
        gender: String
    }
});

User.findOne({'facebook.id': req.user.facebook.id}, function (err, user) {


// this is info from input from client side form that I want to save in  generalInfo property
            user.generalInfo.age = req.body.age;
            user.generalInfo.gender = req.body.gender;
            user.generalInfo.favoriteDog = req.body.favoriteDog

        });