Allow all attributes to be changed by admins

Using ActiveSupport Concerns it's really easy to enable all fields to be editable in RailsAdmin (or your own admin dashboard) through attr_accessible roles. Create a file called app/models/extensions/adminable.rb and put this in it:

module Extensions
  module Adminable
    extend ActiveSupport::Concern

    included do
      send(:attr_accessible, *(column_names + [{as: :admin}])) if table_exists?
    end
  end
end

Then for every model you want to be fully editable by an admin, add this line:

include Extensions::Adminable

If you're using RailsAdmin, add

config.attr_accessible_role { :admin }

to the configure block in your RailsAdmin initializer.