Question

I’m facing a problem with a nested route in Rails an I can’t figure out, what I’m doing wrong.

In a nutshell: I use Devise for authentication an registration. Now I want to have the user enter more detailed information about his contact data. To keep the user model small, I want to use a different model called account. As a user only will have one account, I use a on-to-one association and a nested route. But somehow the routing does not work.
This is my user model:

user.rb

class User < ActiveRecord::Base
  has_one :account, :dependent => :destroy
  attr_accessible :username, :email, :password, :password_confirmation, :remember_me

and this is my account model:

account.rb

class Account < ActiveRecord::Base
 attr_accessible :anrede, :land, :nachname, :plz, :stadt, :strasse, :user_id, :vorname
 belongs_to :user
end

and my route file looks like this:

routes.rb

devise_for :users, :path => 'members'
 resources :users do
  resource :account
 end

As a user might not have a account yet, I test this in my view:

        <% if current_user.account.try %>
        <li><%= link_to "Account", user_account_path %></li>
        <% else %>
        <li><%= link_to "create Account", new_user_account_path %></li>
        <% end %>

but when I enter the root path with a signed in user, Rails tells me

Routing Error
No route matches {:action=>"new", :controller=>"accounts"}

but there is a new action in my accounts_controller.rb as I have scaffolded the whole CRUD set (edited create with current_user.build_account) and it’s also the path given by rake routes.

I’m desperately stuck in this! Could anybody help me, please?

EDIT
This is the output of my rake routes:

        user_account POST   /users/:user_id/account(.:format)      accounts#create
    new_user_account GET    /users/:user_id/account/new(.:format)  accounts#new
   edit_user_account GET    /users/:user_id/account/edit(.:format) accounts#edit
                     GET    /users/:user_id/account(.:format)      accounts#show
                     PUT    /users/:user_id/account(.:format)      accounts#update
                     DELETE /users/:user_id/account(.:format)      accounts#destroy

EDIT2

this is the error message for the action new form:

NoMethodError in Accounts#new

Showing /home/stonjarks/Work/toytrade_devise/app/views/accounts/_form.html.erb where line #1 raised:

undefined method `accounts_path' for #<#<Class:0xa44d0cc>:0xab6222c>

Extracted source (around line #1):

1: <%= form_for(@account) do |f| %>
2:   <% if @account.errors.any? %>
3:     <div id="error_explanation">
4:       <h2><%= pluralize(@account.errors.count, "error") %> prohibited this account from being saved:</h2>

I solved this using this SO hack, but it’s a strange behavior anyway:

Rails Nested Route For Singular Resource

<%= form_for @account,:url=>{:action=>:create}

But I still don’t get the point of this routing anyway. Despite this, I can’t manage to find a route to show the account:

/users/1/account

ActiveRecord::RecordNotFound in AccountsController#show

Couldn't find Account without an ID

Answer 1

new_user_account_path is missing a user instance which should be provided for example:

new_user_account_path(current_user)

If you look at the following line:

new_user_account GET    /users/:user_id/account/new(.:format)  accounts#new

You can see that the path demands a :user_id – a user instance.

You can read here for further clarification of your problem.