Undefined Method New Error


I am creating a basic app for an address book and would like to associate Contacts with Users.

I have set up authentication for Users and am now in the process of trying to link my contacts table with the users. I have two seperate controllers, one for users and another for contacts and then my plan is to associate them through belongs_to:user and has_many :contacts.

I am absolutely stumped by an error I keep receiving though:

undefined method `new' for Contact:Module

As far as I am aware I have defined new correctly in my contact controller but for some reason I can’t get this to work.

I have the following code at the moment:


Contact::Application.routes.draw do

get "sessions/new"
get "logout" => "sessions#destroy"

controller :user do
    get "signup" => "user#new"

resources :users, :controller => 'user'

controller :sessions do
    get "login" => "sessions#new"
    post "login" => "sessions#create"
    delete "logout" => "sessions#destroy"

controller :dashboard do
    get "home" => "dashboard#home"

controller :contact do
    get "newcontact" => "contact#new"

resources :contacts, :controller => 'contact'

root :to => 'sessions#new'


Contact Controller

class ContactController < ApplicationController
  def new
    @contact = Contact.new

  def create
    @contact = Contact.new (params[:contact])
      if @contact.save
        redirect_to root_url
        render "contact#new"

Contact#New view

<div class="column-1">
	<div id="logo">
		<a href="/home"><img id="logo" src="/assets/logo_contacts_small.png" alt="Connect_Logo" style="width=100%" height="100%" /> </a>
	<div id="search">
	<div id="add-contact">s
	 <%= link_to "Add New Contact", newcontact_path %>
	<div class="signout">
			<% if current_user %>
				<%= link_to "Logout", logout_path %>
			<% else %>
				<%= render login_path %>
			<% end %></li>


<div class="column-2">
<div id="contactnew-area">
<div class="contactnew-fields">
<%= form_for @contact do |f| %>

	<% if @contact.errors.any? %>
		<div class="error_messages">
		 <h2>Form is invalid</h2>
				<% for message in @contact.errors.full_messages %>
					<li><%= message %></li>
				<% end %>
	<% end %>	
	<div class = "name-field">
		<%= f.text_field :name, :placeholder => "Name" %>
	<div class = "company-field">
		<%= f.text_field :company, :placeholder => "Company" %>
	<div class = "email-field">
		<%= f.text_field :email, :placeholder => "Email" %>

	<div class = "phone-field">
		<%= f.text_field :phone, :placeholder => "Phone" %>
	<div class = "mobile-field">
		<%= f.text_field :mobile, :placeholder => "Mobile" %>
	<div class="actions"><%= f.submit "Add Contact" %></div>
<% end %>

Contact Model

class Contact < ActiveRecord::Base

belongs_to :user

validates_presence_of :name
validates_presence_of :email
validates_length_of :email, :within => 6..50
validates_uniqueness_of :email, :case_sensitive => false, :on => :create
validates_format_of :email,    :with => /^[A-Z0-9_.%-]+@([A-Z0-9_]+\\.)+[A-Z]{2,4}$/i,

Any help people can offer to fix this error really would be much appreciated because I am totally stuck.

Many thanks in advance for your help!

Tom :slight_smile:

If that is your entire Routes file, you do NOT have a route defined for “/contact/new”
Is that the URI you are using when you get the error?
Based on the definitions in your Routes file you need to use “/newcontact/” Do you get the error when you use that URI?

Hey ParkinT,

Thanks so much for your reply. I have been using the URL Localhost:3000/newcontact as is named in the routes file and sadly I still get the error.

Do you have an idea of what might be causing this? :slight_smile:

Thanks again for your help,

Could you post the stack trace or is that the only thing that shows?

Hey Scannon,

The application Trace is just the error I already mentioned.

If I click on Full Trace I get the following:

app/controllers/contact_controller.rb:3:in `new'
actionpack (3.1.1) lib/action_controller/metal/implicit_render.rb:4:in `send_action'
actionpack (3.1.1) lib/abstract_controller/base.rb:167:in `process_action'
actionpack (3.1.1) lib/action_controller/metal/rendering.rb:10:in `process_action'
actionpack (3.1.1) lib/abstract_controller/callbacks.rb:18:in `block in process_action'
activesupport (3.1.1) lib/active_support/callbacks.rb:416:in `_run__312532209__process_action__116948142__callbacks'
activesupport (3.1.1) lib/active_support/callbacks.rb:386:in `_run_process_action_callbacks'
activesupport (3.1.1) lib/active_support/callbacks.rb:81:in `run_callbacks'
actionpack (3.1.1) lib/abstract_controller/callbacks.rb:17:in `process_action'
actionpack (3.1.1) lib/action_controller/metal/rescue.rb:17:in `process_action'
actionpack (3.1.1) lib/action_controller/metal/instrumentation.rb:30:in `block in process_action'
activesupport (3.1.1) lib/active_support/notifications.rb:53:in `block in instrument'
activesupport (3.1.1) lib/active_support/notifications/instrumenter.rb:21:in `instrument'
activesupport (3.1.1) lib/active_support/notifications.rb:53:in `instrument'
actionpack (3.1.1) lib/action_controller/metal/instrumentation.rb:29:in `process_action'
actionpack (3.1.1) lib/action_controller/metal/params_wrapper.rb:201:in `process_action'
activerecord (3.1.1) lib/active_record/railties/controller_runtime.rb:18:in `process_action'
actionpack (3.1.1) lib/abstract_controller/base.rb:121:in `process'
actionpack (3.1.1) lib/abstract_controller/rendering.rb:45:in `process'
actionpack (3.1.1) lib/action_controller/metal.rb:193:in `dispatch'
actionpack (3.1.1) lib/action_controller/metal/rack_delegation.rb:14:in `dispatch'
actionpack (3.1.1) lib/action_controller/metal.rb:236:in `block in action'
actionpack (3.1.1) lib/action_dispatch/routing/route_set.rb:65:in `call'
actionpack (3.1.1) lib/action_dispatch/routing/route_set.rb:65:in `dispatch'
actionpack (3.1.1) lib/action_dispatch/routing/route_set.rb:29:in `call'
rack-mount (0.8.3) lib/rack/mount/route_set.rb:152:in `block in call'
rack-mount (0.8.3) lib/rack/mount/code_generation.rb:96:in `block in recognize'
rack-mount (0.8.3) lib/rack/mount/code_generation.rb:75:in `optimized_each'
rack-mount (0.8.3) lib/rack/mount/code_generation.rb:95:in `recognize'
rack-mount (0.8.3) lib/rack/mount/route_set.rb:141:in `call'
actionpack (3.1.1) lib/action_dispatch/routing/route_set.rb:532:in `call'
actionpack (3.1.1) lib/action_dispatch/middleware/best_standards_support.rb:17:in `call'
rack (1.3.6) lib/rack/etag.rb:23:in `call'
rack (1.3.6) lib/rack/conditionalget.rb:25:in `call'
actionpack (3.1.1) lib/action_dispatch/middleware/head.rb:14:in `call'
actionpack (3.1.1) lib/action_dispatch/middleware/params_parser.rb:21:in `call'
actionpack (3.1.1) lib/action_dispatch/middleware/flash.rb:243:in `call'
rack (1.3.6) lib/rack/session/abstract/id.rb:195:in `context'
rack (1.3.6) lib/rack/session/abstract/id.rb:190:in `call'
actionpack (3.1.1) lib/action_dispatch/middleware/cookies.rb:331:in `call'
activerecord (3.1.1) lib/active_record/query_cache.rb:62:in `call'
activerecord (3.1.1) lib/active_record/connection_adapters/abstract/connection_pool.rb:477:in `call'
actionpack (3.1.1) lib/action_dispatch/middleware/callbacks.rb:29:in `block in call'
activesupport (3.1.1) lib/active_support/callbacks.rb:392:in `_run_call_callbacks'
activesupport (3.1.1) lib/active_support/callbacks.rb:81:in `run_callbacks'
actionpack (3.1.1) lib/action_dispatch/middleware/callbacks.rb:28:in `call'
actionpack (3.1.1) lib/action_dispatch/middleware/reloader.rb:68:in `call'
rack (1.3.6) lib/rack/sendfile.rb:101:in `call'
actionpack (3.1.1) lib/action_dispatch/middleware/remote_ip.rb:48:in `call'
actionpack (3.1.1) lib/action_dispatch/middleware/show_exceptions.rb:47:in `call'
railties (3.1.1) lib/rails/rack/logger.rb:13:in `call'
rack (1.3.6) lib/rack/methodoverride.rb:24:in `call'
rack (1.3.6) lib/rack/runtime.rb:17:in `call'
activesupport (3.1.1) lib/active_support/cache/strategy/local_cache.rb:72:in `call'
rack (1.3.6) lib/rack/lock.rb:15:in `call'
actionpack (3.1.1) lib/action_dispatch/middleware/static.rb:53:in `call'
railties (3.1.1) lib/rails/engine.rb:456:in `call'
railties (3.1.1) lib/rails/rack/content_length.rb:16:in `call'
railties (3.1.1) lib/rails/rack/log_tailer.rb:14:in `call'
rack (1.3.6) lib/rack/handler/webrick.rb:59:in `service'
C:/RailsInstaller/Ruby1.9.2/lib/ruby/1.9.1/webrick/httpserver.rb:111:in `service'
C:/RailsInstaller/Ruby1.9.2/lib/ruby/1.9.1/webrick/httpserver.rb:70:in `run'
C:/RailsInstaller/Ruby1.9.2/lib/ruby/1.9.1/webrick/server.rb:183:in `block in start_thread'

Thanks again for all your help.


I think the first thing that we need to do is work on your routes.rb file. We can cut that down to almost half and I think it is possible that you might have some conflicting routing going on.

So, I would restructure the routes.rb file like this

Contact::Application.routes.draw do
  get "home" => "dashboard#home", :as => "home"
  get "logout" => "sessions#destroy", :as => "logout"
  get "login" => "sessions#new", :as => "login"
  get "signup" => "users#new", :as => "signup"
  root :to => "sessions#new"

  resources :users
  resources :sessions
  resources :contacts

This provides you with all of the functionality that you need for users, logging in/out, signing up, and managing contacts. The only difference is that you would add a new contact with the url of http://localhost.com/contact/new as opposed to http://localhost.com/newcontact. The former would be the “restful” way of doing it.

Also, the following lines in your view should be changed. (newcontact_path should be new_contact_path)

<div id="add-contact">
  <%= link_to "Add New Contact", new_contact_path %></div>

See what happens if you make these changes. Also, when does this error appear? Right when you start the server and try to use your app or when you are trying to do something? If it is when you are trying to do something post exactly what you did to give us a better idea of what might be going on because outside of the two things I noticed above, I don’t see any other errors.

Hi Scannon,

Thanks for your help again, I have implemented the new setup but am still facing the same error as before. The error is occurring when I hit the link on my Dashboard page to go through to the Adding a new contact view. The server is loading up fine and I can move between other pages without error - it’s only when loading this one page ‘Contact#new’

The error I am still receiving is

undefined method `new' for Contact:Module

My current setup is:

Routes (

Contact::Application.routes.draw do
  get "home" =&gt; "dashboards#home", :as =&gt; "home"
  get "logout" =&gt; "sessions#destroy", :as =&gt; "logout"
  get "login" =&gt; "sessions#new", :as =&gt; "login"
  post "login" =&gt; "sessions#create"
  delete "logout" =&gt; "sessions#destroy"
  get "signup" =&gt; "users#new", :as =&gt; "signup"
  get "contactnew" =&gt; "contacts#new"
  root :to =&gt; "sessions#new"

  resources :users
  resources :sessions
  resources :contacts

dashboards#home (relevant part)

&lt;div id="add-contact"&gt;s
	 &lt;%= link_to "Add New Contact", new_contact_path %&gt;

Contact Model (/contact.rb)

class Contact &lt; ActiveRecord::Base

belongs_to :user

validates_presence_of :name
validates_presence_of :email
validates_length_of :email, :within =&gt; 6..50
validates_uniqueness_of :email, :case_sensitive =&gt; false, :on =&gt; :create
validates_format_of :email,    :with =&gt; /^[A-Z0-9_.%-]+@([A-Z0-9_]+\\.)+[A-Z]{2,4}$/i,


class ContactsController &lt; ApplicationController
  def new
    @contact = Contact.new

  def create
    @contact = Contact.new (params[:contact])
      if @contact.save
        redirect_to root_url
        render "contact/new"

I really am stumped on this as I can see no reason why it won’t work.

Any further advice you can offer would be awesome!


The first thing to check is your contacts controller. In the full stack trace it is looking for a file named contact_controller.rb when it should be contacts_controller.rb. (Though in your latest post you have it pluralized, so I’m not sure which it is.) Check this and if you have a contact_controller.rb I would delete it and have only contacts_controller.rb

Once you are sure that the controller is pluralized and there is no singular version, and if the error continues, try commenting out the code inside the new method and see if that gets rid of the error message.

I’m kind of stumped as well…I’ve never seen that error message before. :stuck_out_tongue:

As a final measure, you could always post your code to Github (if you use it) or send me a zip and I will take a look at the full code to see what is going on.

Also, after a bit of searching, I have found that others have experienced this error when using a reserved word within their application. I don’t see any in the code you posted, but it could be possible that you have something in another file. I’m thinking that at this point it would be best to see your entire app structure to see what is going on.

Hey Scannon,

I finally managed to figure out what was going wrong and don’t think I had given you enough information to work it out :).

Rails was getting confused between the module defined in application.rb (Contact) and my model class (also Contact). Apparently, you can’t have module Contact in one place and class Contact in another.

I had to rename one of them. In my case I renamed my application ContactApp to stop the confusion and everything started working!

Thanks so much for all your help as always :slight_smile: