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我正在尝试使用 Elasticsearch & Tire gem 索引一堆文档。除了记录不完整且没有引用的极少数情况外，索引工作得很好filename。在这些情况下，记录中的任何内容都不会被索引，并且 Elasticsearch 会抛出一个NullPointerException.

我不了解 Java，但想知道是否有办法将某些内容传递给 Attachment Type 插件，以便 Elasticsearch 成功索引其余记录并绕过:type => 'attachment'whereattachment返回null？

尝试过"attachment" : {"type" : "attachment", "null_value" : "missing_file"}（或用轮胎的说法：）indexes :attachment, :type => 'attachment', :null_value => "missing_file"但这似乎没有任何区别。

#app/models/article.rb
class Article < ActiveRecord::Base
  include Tire::Model::Search
  include Tire::Model::Callbacks

  attr_accessible :title, :content, :published_on, :filename

  mapping do
    indexes :id, :type =>'integer'
    indexes :title
    indexes :content
    indexes :published_on, :type => 'date'
    indexes :attachment, :type => 'attachment', :null_value => 'missing_file'  # <== no worky
  end

  def to_indexed_json
    to_json(:methods => [:attachment])
  end

  def attachment
    if filename.present?
       path_to_pdf = "/Volumes/HardDisk/sample_pdfs/#{filename}.pdf"
       Base64.encode64(open(path_to_pdf) { |pdf| pdf.read })
    end
  end
end


#Elasticsearch log:
[2012-06-29 09:01:15,515][DEBUG][action.bulk              ] [Skunge the Laxidazian Troll] [articles][4] failed to execute bulk item (index) index {[articles][article][10], source[{"content":"this title is fluff","created_at":"2012-06-27T22:02:43Z","filename":null,"id":10,"published_on":"2012-06-27","title":"Test title","updated_at":"2012-06-27T22:02:43Z","attachment":null}]}
java.lang.NullPointerException
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