group.rb

# app/models/group.rb

class Group < ApplicationRecord
  include Moderate::GroupConfig
  include Sluggable

  # ...
end

# app/models/concerns/moderate/group_config.rb

module Moderate
  module GroupConfig
    extend ActiveSupport::Concern
    
    included do
      rails_admin do
        edit do
          # ...
        end
        list do
          # ...
        end
      end
    end
  end
end