如何使用Elasticsearch和Tire防止附件存儲在_source中？

Question

我有一些PDF附件在Elasticsearch中被索引，使用輪胎寶石。這一切都很好，但我將有很多GB的PDF，我們可能會將這些PDF存儲在S3中以供訪問。目前，base64編碼的PDF存儲在Elasticsearch _source中，這將使索引變得龐大。我想將附件編入索引，但沒有存儲，我還沒有找到正確的咒語來放置Tire的「映射」塊來阻止它。該塊是像現在這樣的權利：

mapping do 
    indexes :id, :type => 'integer' 
    indexes :title 
    indexes :last_update, :type => 'date' 
    indexes :attachment, :type => 'attachment' 
end 

我試着像一些變化：

indexes :attachment, :type => 'attachment', :_source => { :enabled => false } 

當我運行的輪胎它看起來不錯：進口耙的任務，但它似乎沒有有所作爲。有沒有人知道A）如果這是可能的？和B）如何做到這一點？

在此先感謝。

Answer 1

_source field settings包含應該從源中排除的字段列表。我猜測在輪胎的情況下，應該這樣做：

mapping :_source => { :excludes => ['attachment'] } do 
    indexes :id, :type => 'integer' 
    indexes :title 
    indexes :last_update, :type => 'date' 
    indexes :attachment, :type => 'attachment' 
end 

Answer 2

@imotov的解決方案對我不起作用。當我執行curl命令時

curl -X GET "http://localhost:9200/user_files/user_file/_search?pretty=true" -d '{"query":{"query_string":{"query":"rspec"}}}' 

我仍然可以看到包含在搜索結果中的附件文件的內容。

"_source" : {"user_file":{"id":5,"folder_id":1,"updated_at":"2012-08-16T11:32:41Z","attachment_file_size":179895,"attachment_updated_at":"2012-08-16T11:32:41Z","attachment_file_name":"hw4.pdf","attachment_content_type":"application/pdf","created_at":"2012-08-16T11:32:41Z","attachment_original":"JVBERi0xL ..... 

這裏是我的實現：

include Tire::Model::Search 
include Tire::Model::Callbacks 

def self.search(folder, params) 
    tire.search() do 
    query { string params[:query], default_operator: "AND"} if params[:query].present? 
    filter :term, folder_id: folder.id 
    highlight :attachment_original, :options => {:tag => "<em>"} 
    end 
end 

mapping :_source => { :excludes => ['attachment_original'] } do 
    indexes :id, :type => 'integer' 
    indexes :folder_id, :type => 'integer' 
    indexes :attachment_file_name 
    indexes :attachment_updated_at, :type => 'date' 
    indexes :attachment_original, :type => 'attachment' 
end 

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

def attachment_original 
    if attachment_file_name.present? 
    path_to_original = attachment.path 
    Base64.encode64(open(path_to_original) { |f| f.read }) 
    end  
end