nested routes and form_for and NoMethodError - ruby-on-rails

Question

As the error message stated below, I do not use "user_profiles_path" as plural because I defined "resource :profile" in nested resource.
NoMethodError in Profiles#new
Showing /home/smileymike/rails_projects/bffmapp_v2/app/views/profiles/new.html.erb where line #20 raised:
undefined method `user_profiles_path' for #<#<Class:0x90266ac>:0xa041294>
Model:
class User < ActiveRecord::Base
has_one :profile
class Profile < ActiveRecord::Base
attr_accessible :name, :surname
belongs_to :user
routes.rb:
resources :users do
resource :profile (note: has_one)
end
view: profiles/new.html.erb
<div class="row">
<div class="span6 offset3">
<%= form_for([#user, #profile]) do |f| %>
<%= f.label :name %>
<%= f.text_field :name %>
<%= f.label :surname %>
<%= f.text_field :surname %>
<%= f.submit "Create my profile", class: "btn btn-large btn-primary" %>
<% end %>
</div>
</div>
routes
user_profile POST /users/:user_id/profile(.:format) profiles#create
new_user_profile GET /users/:user_id/profile/new(.:format) profiles#new
edit_user_profile GET /users/:user_id/profile/edit(.:format) profiles#edit
GET /users/:user_id/profile(.:format) profiles#show
PUT /users/:user_id/profile(.:format) profiles#update
DELETE /users/:user_id/profile(.:format) profiles#destroy
users GET /users(.:format) users#index
POST /users(.:format) users#create
new_user GET /users/new(.:format) users#new
edit_user GET /users/:id/edit(.:format) users#edit
user GET /users/:id(.:format) users#show
PUT /users/:id(.:format) users#update
DELETE /users/:id(.:format) users#destroy
sessions POST /sessions(.:format) sessions#create
new_session GET /sessions/new(.:format) sessions#new
session DELETE /sessions/:id(.:format) sessions#destroy
root / static_pages#home
signup /signup(.:format) users#new
signin /signin(.:format) sessions#new
signout DELETE /signout(.:format) sessions#destroy
help /help(.:format) static_pages#help
about /about(.:format) static_pages#about
contact /contact(.:format) static_pages#contact
Controller:
class ProfilesController < ApplicationController
def show
end
def new
#user = current_user
#profile = current_user.build_profile()
end
def edit
end
def create
end
def update
end
def destroy
end
end
below is an illustrate of current_user in profiles_controller.rb
module SessionsHelper
def sign_in(user)
cookies.permanent[:remember_token] = user.remember_token
self.current_user = user
end
def signed_in?
!current_user.nil?
end
def current_user=(user)
#current_user = user
end
def current_user
#current_user ||= User.find_by_remember_token(cookies[:remember_token])
end
def sign_out
self.current_user = nil
cookies.delete(:remember_token)
end
end

Answer 1

Form for using the polymorphic routes like that will always use the pluralized path for new records. You will need to be explicit in your form:
form_for([#user, #profile], :url => user_profile_path(#user))
Good news though, the create route is the same as the update route.