application_controller.rb

class ApplicationController < ActionController::Base
  # Prevent CSRF attacks by raising an exception.
  # For APIs, you may want to use :null_session instead.
  protect_from_forgery with: :exception

  before_action :authenticate_user!, :except => [:index, :about, :contact, :faq]

  before_action :configure_permitted_parameters, if: :devise_controller?


protected

def configure_permitted_parameters
  devise_parameter_sanitizer.permit(:sign_up, keys: [:username])
end

def after_sign_in_path_for(resource)
    admin_root_path
end

end

console

Started POST "/users/sign_in" for 127.0.0.1 at 2016-05-29 21:25:22 +0300
Processing by Devise::SessionsController#create as HTML
  Parameters: {"utf8"=>"✓", "authenticity_token"=>"c9ZNc55D6+A0O2grI9iAkB4zcrFuA/Gl15ePKlCELw/ljXlrigN0/jKL9p4I+CsTB3GfSqUXTuHXYEuySunk4Q==", "user"=>{"email"=>"[email protected]", "password"=>"[FILTERED]", "remember_me"=>"0"}, "commit"=>"Sign in"}
  User Load (0.6ms)  SELECT  "users".* FROM "users" WHERE "users"."email" = ? ORDER BY "users"."id" ASC LIMIT ?  [["email", "[email protected]"], ["LIMIT", 1]]
   (0.1ms)  begin transaction
  SQL (1.1ms)  UPDATE "users" SET "current_sign_in_at" = ?, "last_sign_in_at" = ?, "sign_in_count" = ?, "updated_at" = ? WHERE "users"."id" = ?  [["current_sign_in_at", 2016-05-29 18:25:22 UTC], ["last_sign_in_at", 2016-05-29 18:13:34 UTC], ["sign_in_count", 6], ["updated_at", 2016-05-29 18:25:22 UTC], ["id", 1]]
   (0.9ms)  commit transaction
Redirected to http://localhost:3000/admin
Completed 302 Found in 185ms (ActiveRecord: 2.7ms)


Started GET "/admin" for 127.0.0.1 at 2016-05-29 21:25:22 +0300
Processing by Admin::ApplicationController#index as HTML
  User Load (0.3ms)  SELECT  "users".* FROM "users" WHERE "users"."id" = ? ORDER BY "users"."id" ASC LIMIT ?  [["id", 1], ["LIMIT", 1]]
  Rendering admin/application/index.html.erb within layouts/application
  Rendered admin/application/index.html.erb within layouts/application (217.9ms)
Completed 500 Internal Server Error in 227ms (ActiveRecord: 0.3ms)



ActionView::Template::Error (undefined local variable or method `admin_users_path' for #<#<Class:0x007ff09acff368>:0x007ff09acfc618>
Did you mean?  admin_root_path):
    10:   <div class="col-md-3">
    11:     <h2>Admin Links</h2>
    12:     <ul class="nav nav-stacked">
    13:       <li><%= link_to "Users", admin_users_path %></li>
    14:       <li><%= link_to "Home Page", root_path %></li>
    15:     </ul>
    16:   </div>

app/views/admin/application/index.html.erb:13:in `_app_views_admin_application_index_html_erb___4523770763820209107_70335727961300'
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  Rendered /Users/dawidof/.rvm/gems/ruby-2.3.1/gems/actionpack-5.0.0.rc1/lib/action_dispatch/middleware/templates/rescues/_source.html.erb (3.9ms)
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  Rendered /Users/dawidof/.rvm/gems/ruby-2.3.1/gems/web-console-3.1.1/lib/web_console/templates/console.js.erb within layouts/javascript (60.8ms)
  Rendering /Users/dawidof/.rvm/gems/ruby-2.3.1/gems/web-console-3.1.1/lib/web_console/templates/main.js.erb within layouts/javascript
  Rendered /Users/dawidof/.rvm/gems/ruby-2.3.1/gems/web-console-3.1.1/lib/web_console/templates/main.js.erb within layouts/javascript (0.3ms)
  Rendered /Users/dawidof/.rvm/gems/ruby-2.3.1/gems/web-console-3.1.1/lib/web_console/templates/index.html.erb (107.2ms)