1.gem

gem ‘activeadmin‘,github: ‘activeadmin‘
gem ‘devise‘

2.install

rails g active_admin:install

The generator adds these core files, among others:

app/admin/dashboard.rb
app/assets/javascripts/active_admin.js.coffee
app/assets/stylesheets/active_admin.css.scss
config/initializers/active_admin.rb

3.migrate

rake db:migrate
rails server

4.config initializers active_admin,devise

5.create another model

rails g devise User
rake db:migrate

Rails active_admin devise调试记录