Adds metadata to pgsearch documents, allowing search results to be rendered with just the document data.

pg_search_document_metadata.rb

module PgSearch
  module ClassMethods
    def rebuild_pg_search_documents
      self.find_each {|record| record.update_pg_search_document}
    end
  end

  class Document
    before_validation do
      self.meta = generate_meta
    end

    def meta
      @meta_hash ||= HashWithIndifferentAccess.new(
        ActiveSupport::JSON.decode(self[:meta])
      )
    end

    def meta=(data)
      self[:meta] = ActiveSupport::JSON.encode(data)
    end

    def generate_meta
      against = searchable.pg_search_multisearchable_options[:against]
      against.inject({}) do |memo, method|
        memo.merge({method => searchable.send(method)})
      end
    end
  end
end