ensure last admin remains while destroying/deleting/removing an user in devise authentication

I'm new to rails.I'm working on a small application which needs an admin role who can add, modify and delete the content. So some models/views should be hidden from general users and only admin can have access to them through authentication.

To achieve this I have used 'rails_admin' and 'devise' gems. I did not the want the sign_up page to be shown to genral user, so I have removed that removing :registerable from my Admin model.

Now everything seems fine but, when I log in through an admin, delete each and every admin from my dashboard, I cannot login again since I have removed the sign_up page.

So I want to ensure that my last user remains. A warning/notice should be shown user while deleting the last user. I wrote the following code for that

   def ensure_an_admin_remains
      if Admin.count.zero?
         raise "Can't delete last user"

This throws an error but my browser shows all the Error details. I want it to be shown to as a flash message. I think I have to change the devise controllers destroy method. But I don't know where to find it and how to do the required changes.

Can someone please help me on this?


In controller...

def destroy 
  admin = Admin.find(params[:id])
    redirect_to admins_path, notice: 'Admin destroyed.'
  rescue => e 
    redirect_to admins_path, alert: e.message 

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