ruby - Rails 4 and Devise: nested attributes validations not working -

i using devise in rails 4 app. have member model (for devise) , user model contains profile info each member. member accepts nested attributes user. see form below new registration custom routes in routes.rb file.

my problem - works fine except validation of user attributes. if leave first name , last name blank, validates (but crashes this:

but other validations member (the devise model) work - end on /members page error message displayed should. unsure going on - shouldn't devise show error messages invalid nested attributes?

class members::registrationscontroller < devise::registrationscontroller      # /resource/sign_up      def new         build_resource({})         self.resource.user = user.new         respond_with self.resource      end      # post /resource     def create         super         resource.user.ip_address = request.remote_ip         resource.user.email = resource.email         resource.user.save!     end      private      def sign_up_params         allow = [:provider, :uid, :email, :password, :password_confirmation, user_attributes: [:member_id, :email, :first_name, :last_name, :institution, :city, :country, :job_title, :about, :tag_list, :picture, :ip_address]]         params.require(resource_name).permit(allow)     end    end 

member.rb

  class member < activerecord::base       devise :database_authenticatable, :registerable,      :recoverable, :rememberable, :trackable, :validatable, :omniauthable, :trackable        has_one :user, dependent: :destroy, autosave: true        accepts_nested_attributes_for :user    end 

user.rb

  class user < activerecord::base         belongs_to :member         validates :first_name, presence: true         validates :last_name, presence: true    end 

in routes.rb

   devise_for :members, controllers: {registrations: 'members/registrations',                                       omniauth_callbacks: 'members/omniauth_callbacks',                                       sessions: 'members/sessions' } 

in members/registrations/new.html.erb

       <%= form_for(resource, :as => resource_name, :url => registration_path(resource_name), html: { role: "form" }) |f| %>            <%= f.fields_for(:user) |user_fields| %>            <%= user_fields.text_field :first_name, autofocus: true, class: 'form-control', :placeholder => "first name" %>            <%= user_fields.text_field :last_name, class: 'form-control', :placeholder => "last name" %>             <% end %>         <%= f.email_field :email, autofocus: true, class: "form-control", :placeholder => "email" %>         <%= f.password_field :password, class: "form-control", :placeholder => "password" %>         <%= f.submit t('.sign_up', :default => "sign up"), class: "btn btn-danger" %>         <% end %> 

here log this

   started post "/members" ::1 @ 2015-07-16 15:18:54 +0100    processing members::registrationscontroller#create html    parameters: {"utf8"=>"✓",          "authenticity_token"=>"sixk1ptvrxnhubddxatkfllg27fvqypq3muvo398thomomi1s3i2o3vbm gwrf6pvn1nfbr5vnr8ezkp6xnmzqw==", "member"=>{"user_attributes"=>{"first_name"=>"", "last_name"=>""}, "email"=>"slfwalsh@gmail.com", "password"=>"[filtered]"}, "commit"=>"sign up"}    (0.2ms)  begin transaction    member exists (0.3ms)  select  1 one "members" "members"."email" = 'slfwalsh@gmail.com' limit 1   (0.1ms)  rollback transaction   rendered devise/shared/_links.erb (9.9ms)     rendered members/registrations/new.html.erb within layouts/static_home_page (19.8ms)     rendered layouts/_static_login_header.html.erb (4.1ms)      (0.1ms)  begin transaction     (0.1ms)  rollback transaction     completed 422 unprocessable entity in 1499ms 

the reason why seeing page because save! triggers validation errors if validation of attributes failed , errors displayed in page. on other hand save doesn't display validation errors cancels transaction being saved if of validations failed. changing create method below should solve problem.

def create   super   resource.user.ip_address = request.remote_ip   resource.user.email = resource.email   resource.user.save end