Forms with routes in Rails 4.1 - ruby-on-rails

Question

Rails 4.1, reaching the driver knowing edit and use _form.html.erb again. I tried to do the following:
 
<% = Form_for #user, :controller => "admin/users" do | f |%>
<button type='submit'>Guardar</button>
<% end %>
#Controller
===============
def new
#user = User.new
end
def create
#user = User.new(user_params)
respond_to do |format|
if #user.save
format.html { redirect_to admin_users_url, notice: "User ##user.name} was successfully created." }
format.json { render :controller => 'admin/users', action: 'show', status: :created, location: #user }
else
format.html { render :controller => 'admin/users', action: 'new' }
format.json { render json: #user.errors, status: :unprocessable_entity }
end
end
end
But it does not work I can not get to the route that is my controller ("admin / users"), if anyone can help me

Answer 1

I assume that you have your admin routes defined in your config/routes.rb like this:
# in config/routes.rb
namespace :admin do
resources :users
end
See: Rails Guide about namespaces in routes
Then this should work for an admin namespaced form in your view:
<%= form_for [:admin, #user] do |f| %>
...
<% end %>
See: Rails Guide about namespaces and form helper
Your controller code looks okay, but please ensure that the controller is namespaced too:
# in app/controllers/admin/users_controller.rb
module Admin
class UsersController
# ...
end
end