ActiveRecord::ReadOnlyRecord when using ActiveAdmin and Friendly_id

Question

I started using ActiveAdmin recently in a project and almost everything works great but I\'m having a problem when using it in combination with the friendly_id gem. I\'m ge

Answer 1

You can customize the resource retrieval according to http://activeadmin.info/docs/2-resource-customization.html#customizing_resource_retrieval. Note that you want to use the find_resource method instead of resource, or you won't be able to create new records.

(Check https://github.com/gregbell/active_admin/blob/master/lib/active_admin/resource_controller/data_access.rb for more details)

In your ActiveAdmin resource class write:

controller do
  def find_resource
    scoped_collection.where(slug: params[:id]).first!
  end
end

You can also overwrite the behavior for all resources by modyfing the ResourceController in the active_admin.rb initializer.

ActiveAdmin::ResourceController.class_eval do
  def find_resource
    if scoped_collection.is_a? FriendlyId
      scoped_collection.where(slug: params[:id]).first! 
    else
      scoped_collection.where(id: params[:id]).first!
    end
  end
end

Hope that helps!

Side note: When creating new records through the admin interface make sure you don't include the slug field in the form, or FriendlyId will not generate the slugs. (I believe that's for version 5+ only)