contact request model

class ContactRequest < ActiveRecord::Base
  belongs_to :user
  validates :user_id, presence: true
  validates :message, presence: true, length: { maximum: 500 }
end

Error

Started POST "/test" for ::1 at 2014-12-02 21:44:04 -0800
Processing by UsersController#create as JS
  Parameters: {"utf8"=>"✓", "users"=>{"first_name"=>"bradddddy", "last_name"=>"li", "email"=>"[email protected]", "phone_number"=>"123123123", "message"=>"hi there bud"}, "commit"=>"Save Users"}
Unpermitted parameter: message
   (0.1ms)  BEGIN
   (0.1ms)  ROLLBACK
Completed 500 Internal Server Error in 2ms

ArgumentError (wrong number of arguments (1 for 0)):
  app/controllers/users_controller.rb:46:in `create'


  Rendered /Users/bli1/.rvm/gems/ruby-2.1.3/gems/web-console-2.0.0/lib/action_dispatch/templates/rescues/_source.erb (4.1ms)
  Rendered /Users/bli1/.rvm/gems/ruby-2.1.3/gems/web-console-2.0.0/lib/action_dispatch/templates/rescues/_trace.text.erb (0.5ms)
  Rendered /Users/bli1/.rvm/gems/ruby-2.1.3/gems/web-console-2.0.0/lib/action_dispatch/templates/rescues/_request_and_response.text.erb (0.5ms)
  Rendered /Users/bli1/.rvm/gems/ruby-2.1.3/gems/web-console-2.0.0/lib/action_dispatch/templates/rescues/diagnostics.text.erb (14.8ms)
^C[2014-12-02 21:51:23] INFO  going to shutdown ...

form

<!-- contact -->
<section id="contact">
  <div class="container">
    <div class="title-container">Contact Us</div>
    <div class="title-caption">Reach us at (415)-911-9999</div>
    <%= form_for(:users, remote: true, id: "contact-form", class: "contact-input") do |f| %>
      <div class="col-md-12">
        <div class="col-md-6">
          <div class="contact-input-margin form-group">
            <%= f.text_field(:first_name, class: "form-control", placeholder: "First name")%>
          </div>
          <div class="contact-input-margin form-group">
            <%= f.text_field(:last_name, class: "form-control", placeholder: "Last name") %>
          </div>
          <div class="contact-input-margin form-group">
            <%= f.email_field(:email, class: "form-control", placeholder: "Email") %>
          </div>
          <div class="contact-input-margin form-group">
            <%= f.telephone_field(:phone_number, class: "form-control", placeholder: "Phone number") %>
          </div>
        </div>
        <div class="contact-input-margin col-md-6">
          <div class="form-group">
            <%= f.fields_for :contact_requests do |builder| %>
              <%= f.text_area(:message, class: "form-control contact-margin", rows: "8", placeholder: "Message...") %>
              <% end %>
          </div>
        </div>
      </div>
      <%= f.submit(class: "btn btn-xl") %>
    <% end %>
  </div>
</section>

user controller

class UsersController < ApplicationController

  def new
  end

  # def create
  # 	# render plain: params[:users].inspect
  # 	if User.find_by(email: params[:user][:email])
  # 	  # create new row in contact_request table
  # 	  @contact_request = ContactRequest.new(params[:user][:message])
  # 	  @contact_request.save
  # 	else
  # 	  # create new user row and also new row in contact_request table
  # 	  @user = User.new(user_params)
  # 	  @user.save
  # end

  # private

  #   def user_params
  #     # strong_parameters, which requires us to tell Rails exactly which parameters
  #     # we want to accept in our controllers
  #     params.require(:users).permit(:first_name, :last_name, :email, :phone_number, :message)
  #   end

  #   def contact_request_params
  #     # params.require
  #   end


  # def create
  # 	# if !(User.find_by(email: params[:users][:email]))
  #   if User.where(email: params[:users][:email]).empty?
  # 	  @user = User.new(user_params)
  #     @user.contact_request = ContactRequest.new(contact_request_params)
  #     @user.contact_request.save
  # 	  @user.save
  #   else
  #     @user.contact_request = ContactRequest.new(contact_request_params)
  #     @user.contact_request.save
  #   end
    
  # end

  def create 
    User.create(user_params)
  end



  private

    def user_params
      # strong_parameters, which requires us to tell Rails exactly which parameters
      # we want to accept in our controllers
      params.require(:users).permit(:first_name, :last_name, :email, :phone_number, contact_request_attributes: [:message])
    end

end

user model

class User < ActiveRecord::Base
  # before_save { |user| user.email = user.email.downcase }
  has_many :contact_requests
  # validate the presence of the attributes
  validates(:first_name, presence: true)
  validates(:last_name, presence: true)
  validates(:email, presence: true)
  accepts_nested_attributes_for :contact_requests

end