Rails - uninitialised constant AdminUser with ActiveAdmin gem

Question

I'm new in Rails and I'll try to install ActiveAdmin to my existing project (Rails 3.2.1).

i've had activeadmin, meta_search, devise and sass-rails in my gemfile. Require devise in the configuration/application.rb.

When I try to run "rails generate active_admin:install" or "rails server", i have an error :

C:/RailsInstaller/Ruby1.9.3/l ive_support/inflector/methods connstant AdminUser (NameError)

I dont know how to fix.

Thanks :)

Answer 1

Just delete the following line on routes.rb

devise_for :admin_users, ActiveAdmin::Devise.config

Then rerun

rails g active_admin:install

Answer 2

I got this same error after uninstalling and resintalling activeadmin (as I wanted to remove it from admin_user to install it in my own user).

Solution was to search through my project for "admin", and comment all the code that activeadmin had left after uninstall.

The files where I found activeadmin code were:

routes.rb
schema.rb