Trying to use friendly_id with acts_as_nested_set

friendly_id_plus_acts_as_nested_set

class Category < ActiveRecord::Base
  include Liquid::Category
  extend FriendlyId

  friendly_id :name, :use => :slugged, :slug_column => 'permalink',:slug_generator_class => CategorySlugGenerator 

  acts_as_nested_set :dependent => :destroy

  ...

end

# Then

# Knows how to generate a slug for a category
class CategorySlugGenerator < FriendlyId::SlugGenerator

  def generate
    if self.sluggable.parent_id.nil?
      result = self.sluggable.name.to_url + "/"
    else
      result = self.sluggable.parent.permalink + (self.sluggable.permalink.blank? ? self.sluggable.name.to_url : self.sluggable.permalink.split("/").last) + "/"
    end
    result
  end

end

I don't know the whole context here, but I suspect you do not need to override the slug generator class for this, you should be able to get away with just defining generate in a method in your model, and then doing friendly_id :your_method.

@norman, thanks, i assume that will take care of conflicts, right?

Yes, exactly.