create new devise user from another non devise controller - ruby-on-rails

Question

I have a users table (Devise) , with a column "admin" (boolean) to qualify my users.
I also have a namespace "Backend".
I would like that my admins users can create new users from the backend namespace.
So I created a Backend::UsersController :
class Backend::UsersController < ApplicationController
layout 'admin'
before_filter :authenticate_user!
def index
#auteurs = User.all
respond_to do |format|
format.html # index.html.erb
format.json { render json: #auteurs }
end
end
def new
#auteur = User.new
respond_to do |format|
format.html # new.html.erb
format.json { render json: #auteur }
end
end
def create
#auteur = User.new(params[:auteur])
respond_to do |format|
if #auteur.save
format.html { redirect_to #auteur, notice: 'Article was successfully created.' }
format.json { render json: #auteur, status: :created, location: #auteur }
else
format.html { render action: "new" }
format.json { render json: #auteur.errors, status: :unprocessable_entity }
end
end
end
end
Here's the "_form" partial called in the "new" view :
<%= simple_form_for(#auteur) do |f| %>
<%= f.error_notification %>
<div class="form-inputs">
<%= f.input :email %>
</div>
<div class="form-actions">
<%= f.button :submit %>
</div>
<% end %>
An here's my routes :
namespace :backend do
resources :articles
root to: "articles#index"
resources :accueil
resources :users
get "users/index"
get "users/create"
get "users/new"
end
devise_for :users
But when I try to access to "backend/users/new", it drives me to this error :
NoMethodError in Backend/users#new
Showing C:/Ruby/acturevue/app/views/backend/users/_form.html.erb where line #1 raised:
undefined method `users_path' for #<#<Class:0x39616b0>:0x416f6d0>
Does somebody have any ideas of the source of the problem ?
Thanks
UPDATE
So, I modified my code like that :
In Backend::UsersController :
def new
#user = User.new
respond_to do |format|
format.html # new.html.erb
format.json { render json: #user}
end
end
def create
#user = User.new(params[:user])
respond_to do |format|
if #user.save
format.html { redirect_to backend_users_path(#user), notice: 'Article was successfully created.' }
format.json { render json: #user, status: :created, location: #user }
else
format.html { render action: "new" }
format.json { render json: #user.errors, status: :unprocessable_entity }
end
end
end
In _form :
<%= simple_form_for(#user) do |f| %>
But I still have the error.
However the backend_users_path exists in y routes :
backend_users GET /backend/users(.:format) backend/users#
index
POST /backend/users(.:format) backend/users#
create
new_backend_user GET /backend/users/new(.:format) backend/users#
new
edit_backend_user GET /backend/users/:id/edit(.:format) backend/users#
edit
backend_user GET /backend/users/:id(.:format) backend/users#
show
PUT /backend/users/:id(.:format) backend/users#
update
DELETE /backend/users/:id(.:format) backend/users#
destroy

Answer 1

You need to use the namespace in your redirect:
redirect_to [:backend, #auteur] #...
See my answer to this question.