ruby on rails - Activeadmin render 'new' gives Couldn't find User without an id when trying to override the create controller method -

i'm trying create page in activeadmin user can go in , create new user accounts.

i'm overriding default create method user model code below.

i'm getting error couldn't find user without id when try render new page.

why getting error when trying re-render new action?

activeadmin.register user    permit_params     permitted = [:email, :encrypted_password]     permitted << :admin if current_user.is_admin?     permitted   end    # we're overriding new , edit controller methods create users devise. otherwise passwords don't encrypted   controller        def create         user = user.new         user.name = params[:user][:name]         user.email = params[:user][:email]         user.admin = params[:user][:admin]         user.password = params[:user][:encrypted_password]         user.password_confirmation = params[:user][:encrypted_password]          if user.save           redirect_to admin_user_path(user)         else           flash.now[:error] = user.errors.full_messages           render 'new'     # causes error "couldn't find user without id"           #redirect_to new_admin_user_path # redirect works fine         end       end      end  end 

logs:

started "/admin/users/new" 127.0.0.1 @ 2014-03-09 21:34:35 -0500 processing admin::userscontroller#new html   user load (0.4ms)  select `users`.* `users` `users`.`id` = 1 order `users`.`id` asc limit 1   rendered /users/tomcaflisch/.rvm/gems/ruby-2.1.1@myapp/bundler/gems/active_admin-739b93bf9d22/app/views/active_admin/resource/new.html.arb (31.1ms) completed 200 ok in 37ms (views: 34.1ms | activerecord: 0.4ms)   started "/admin/users/new" 127.0.0.1 @ 2014-03-09 21:34:42 -0500 processing admin::userscontroller#new html   user load (0.2ms)  select `users`.* `users` `users`.`id` = 1 order `users`.`id` asc limit 1   rendered /users/tomcaflisch/.rvm/gems/ruby-2.1.1@myapp/bundler/gems/active_admin-739b93bf9d22/app/views/active_admin/resource/new.html.arb (32.7ms) completed 200 ok in 60ms (views: 35.4ms | activerecord: 4.3ms)   started post "/admin/users" 127.0.0.1 @ 2014-03-09 21:34:44 -0500 processing admin::userscontroller#create html   parameters: {"utf8"=>"✓", "authenticity_token"=>"aa6tbt0laddckahs+gfokqrosvgtnxtlglwzvcovics=", "user"=>{"name"=>"", "email"=>"", "encrypted_password"=>"[filtered]", "admin"=>"0"}, "commit"=>"create user"}   user load (0.6ms)  select `users`.* `users` `users`.`id` = 1 order `users`.`id` asc limit 1    (0.2ms)  begin    (0.2ms)  rollback   rendered /users/tomcaflisch/.rvm/gems/ruby-2.1.1@myapp/bundler/gems/active_admin-739b93bf9d22/app/views/active_admin/resource/new.html.arb (14.6ms) completed 500 internal server error in 25ms  activerecord::recordnotfound - couldn't find user without id: 

i'm little late game here ran this. use @user instead of user.