How to customise authorisation rails_admin

rails_admin-customise_authorisation.md

How to authorize rails_admin

config.authenticate_with do
  warden.authenticate!
end

config.authorize_with do
  redirect_to main_app.root_path unless current_user.has_role?(:admin)
end

To exclude actions from Model

In your rails_admin.rb

RailsAdmin.config do |config|
  config.actions do 
    new do 
      except ['YourModel']
    end
  end
end