Installing active_admin generated this notice:
Some setup you must do manually if you haven't yet:
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Ensure you have defined default url options in your environments files. Here is an example of default_url_options appropriate for a development environment in config/environments/development.rb:
config.action_mailer.default_url_options = { host: 'localhost', port: 3000 }
In production, :host should be set to the actual host of your application.
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Ensure you have defined root_url to something in your config/routes.rb. For example:
root to: "home#index"
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Ensure you have flash messages in app/views/layouts/application.html.erb. For example:
<%= notice %>
<%= alert %>
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You can copy Devise views (for customization) to your app by running:
rails g devise:views