ActiveAdmin Comment model not working properly

Look like a bug (ActiveAdmin has it's own built-in Comment model/class already): https://github.com/gregbell/active_admin/issues/64

A possible workaround could be to give your Comment model a different name within in app/admin/comments.rb:

ActiveAdmin.register Comment, :as => "PostComment" do

try this

run in terminal

rails g active_admin:resource ActiveAdmin::Comment

---

add a following lines in app/admin/active_admin_comment.rb

ActiveAdmin.register ActiveAdmin::Comment, :as => "Comment" do
end

---

after that edit config/initializers/active_admin

[...]
  config.comments_registration_name = "OldComment"
  config.show_comments_in_menu = false
[...]

And now you have opportunity to customize a comments in app/admin/active_admin_comment.rb but i still didn't find solution to add :update and :destroy actions