Active admin install error

Question

I have an error, when try to run command:

rails g active_admin:install

The error is:

user@user1:~/projectX$ rails g active_admin:install invoke devise /home/user/.rvm/gems/ruby-2.2.0/bundler/gems/activeadmin-6bde1f57ec5f/lib/generators/active_admin/devise/devise_generator.rb:21:in rescue in install_devise': uninitialized constant ActiveAdmin::Generators::DeviseGenerator::DependencyError (NameError) from /home/user/.rvm/gems/ruby-2.2.0/bundler/gems/activeadmin-6bde1f57ec5f/lib/generators/active_admin/devise/devise_generator.rb:19:ininstall_devise' from /home/user/.rvm/gems/ruby-2.2.0/gems/thor-0.19.1/lib/thor/command.rb:27:in run' from /home/user/.rvm/gems/ruby-2.2.0/gems/thor-0.19.1/lib/thor/invocation.rb:126:ininvoke_command' from /home/user/.rvm/gems/ruby-2.2.0/gems/thor-0.19.1/lib/thor/invocation.rb:133:in block in invoke_all' from /home/user/.rvm/gems/ruby-2.2.0/gems/thor-0.19.1/lib/thor/invocation.rb:133:ineach' from /home/user/.rvm/gems/ruby-2.2.0/gems/thor-0.19.1/lib/thor/invocation.rb:133:in map' from /home/user/.rvm/gems/ruby-2.2.0/gems/thor-0.19.1/lib/thor/invocation.rb:133:ininvoke_all' from /home/user/.rvm/gems/ruby-2.2.0/gems/thor-0.19.1/lib/thor/group.rb:232:in dispatch' from /home/user/.rvm/gems/ruby-2.2.0/gems/thor-0.19.1/lib/thor/invocation.rb:115:ininvoke' from /home/user/.rvm/gems/ruby-2.2.0/gems/thor-0.19.1/lib/thor/group.rb:277:in block in _invoke_for_class_method' from /home/user/.rvm/gems/ruby-2.2.0/gems/thor-0.19.1/lib/thor/shell.rb:68:inwith_padding' from /home/user/.rvm/gems/ruby-2.2.0/gems/thor-0.19.1/lib/thor/group.rb:266:in _invoke_for_class_method' from /home/user/.rvm/gems/ruby-2.2.0/gems/thor-0.19.1/lib/thor/group.rb:133:in_invoke_from_option_users' from /home/user/.rvm/gems/ruby-2.2.0/gems/thor-0.19.1/lib/thor/command.rb:27:in run' from /home/user/.rvm/gems/ruby-2.2.0/gems/thor-0.19.1/lib/thor/invocation.rb:126:ininvoke_command' from /home/user/.rvm/gems/ruby-2.2.0/gems/thor-0.19.1/lib/thor/invocation.rb:133:in block in invoke_all' from /home/user/.rvm/gems/ruby-2.2.0/gems/thor-0.19.1/lib/thor/invocation.rb:133:ineach' from /home/user/.rvm/gems/ruby-2.2.0/gems/thor-0.19.1/lib/thor/invocation.rb:133:in map' from /home/user/.rvm/gems/ruby-2.2.0/gems/thor-0.19.1/lib/thor/invocation.rb:133:ininvoke_all' from /home/user/.rvm/gems/ruby-2.2.0/gems/thor-0.19.1/lib/thor/group.rb:232:in dispatch' from /home/user/.rvm/gems/ruby-2.2.0/gems/thor-0.19.1/lib/thor/base.rb:440:instart' from /home/user/.rvm/gems/ruby-2.2.0/gems/railties-4.2.0/lib/rails/generators.rb:157:in invoke' from /home/user/.rvm/gems/ruby-2.2.0/gems/railties-4.2.0/lib/rails/commands/generate.rb:13:in' from /home/user/.rvm/gems/ruby-2.2.0/gems/railties-4.2.0/lib/rails/commands/commands_tasks.rb:123:in require_command!' from /home/user/.rvm/gems/ruby-2.2.0/gems/railties-4.2.0/lib/rails/commands/commands_tasks.rb:130:ingenerate_or_destroy' from /home/user/.rvm/gems/ruby-2.2.0/gems/railties-4.2.0/lib/rails/commands/commands_tasks.rb:50:in generate' from /home/user/.rvm/gems/ruby-2.2.0/gems/railties-4.2.0/lib/rails/commands/commands_tasks.rb:39:inrun_command!' from /home/user/.rvm/gems/ruby-2.2.0/gems/railties-4.2.0/lib/rails/commands.rb:17:in <top (required)>' from /home/user/projectX/bin/rails:8:in' from /home/user/.rvm/rubies/ruby-2.2.0/lib/ruby/site_ruby/2.2.0/rubygems/core_ext/kernel_require.rb:54:in require' from /home/user/.rvm/rubies/ruby-2.2.0/lib/ruby/site_ruby/2.2.0/rubygems/core_ext/kernel_require.rb:54:inrequire' from -e:1:in `'

Active admin and devise gems are installed. The only problem is when I generate active admin. I use Rails-4.1.8 and ruby-2.1.4.

Thanks for help and good day.

Answer 1

You need to add the gem 'devise' to your Gemfile or directly using the cli

bundle add devise

or you need to run the install with the the --skip-users flag.

rails g active_admin:install --skip-users

Answer 2

Works for me.

gem 'devise', '~> 3.2'

Answer 3

activeadmin gem (I mean latest version of gem on rubygems.org) still is not compatible with Rails 4.x.

Try to use use latest version of activeadmin from repository:

gem 'activeadmin', github: 'activeadmin/activeadmin', branch: :master