dm-sphinx-adapter sort by weight

module Blah
  include DataMapper::SphinxResource
  property :id, Serial
  property :name, String

  # No dm-is-searchable, we need to order by :weight.
  def self.my_search(search_options = {}, options = {})
    docs    = repository(:search){self.all(search_options)}
    ids     = docs.map{|doc| doc[:id]}
    results = self.all(options.merge(:id => ids))

    # Sort by the ids which are ordered by :weight in the first place.
    results.sort{|a, b| ids.index(a.id) <=> ids.index(b.id)}
  end
end