Simple mongoid models and creation controllers

request

curl http://localhost:3000/users -d "{'user': {'firstName': 'Abhishek', 'loginInfo':{'password':'p'}}}"

user.rb

class User
    include Mongoid::Document
    store_in collection: "dummy"

    field :firstName, type: String
    field :lastName, type: String
    embeds_one :logininfo, store_as: "loginInfo"
end 

class Logininfo
    include Mongoid::Document
    field :username, type: String
    field :password, type: String
    embedded_in :user
end

users_controller.rb

class UsersController < ApplicationController
    def index
        render :json => User.all
    end
    def create
        User.create(params[:user]).save!
        render :json => "ok"
    end
end