레일 캐쉬를 사용하여 Nokogiri 개체를 저장하려면 어떻게해야합니까?

Question

레일 캐쉬를 사용하여 Nokogiri 개체를 저장하려면 레일즈 5를 사용하고 있습니다.

제가 설정/초기화/cache.rb이 만든 :

$cache = ActiveSupport::Cache::MemoryStore.new 

와 나는 같은 문서를 저장하고 싶었 :

$cache.fetch(url) { 
    result = get_content(url, headers, follow_redirects) 
} 

을하지만 난이 오류 받고 있어요 :

Error during processing: (TypeError) no _dump_data is defined for class Nokogiri::HTML::Document 
/Users/davea/.rvm/gems/ruby-2.4.0/gems/activesupport-5.0.2/lib/active_support/cache.rb:671:in `dump' 
/Users/davea/.rvm/gems/ruby-2.4.0/gems/activesupport-5.0.2/lib/active_support/cache.rb:671:in `dup_value!' 
/Users/davea/.rvm/gems/ruby-2.4.0/gems/activesupport-5.0.2/lib/active_support/cache/memory_store.rb:128:in `write_entry' 
/Users/davea/.rvm/gems/ruby-2.4.0/gems/activesupport-5.0.2/lib/active_support/cache.rb:398:in `block in write' 
/Users/davea/.rvm/gems/ruby-2.4.0/gems/activesupport-5.0.2/lib/active_support/cache.rb:562:in `block in instrument' 
/Users/davea/.rvm/gems/ruby-2.4.0/gems/activesupport-5.0.2/lib/active_support/notifications.rb:166:in `instrument' 
/Users/davea/.rvm/gems/ruby-2.4.0/gems/activesupport-5.0.2/lib/active_support/cache.rb:562:in `instrument' 
/Users/davea/.rvm/gems/ruby-2.4.0/gems/activesupport-5.0.2/lib/active_support/cache.rb:396:in `write' 
/Users/davea/.rvm/gems/ruby-2.4.0/gems/activesupport-5.0.2/lib/active_support/cache.rb:596:in `save_block_result_to_cache' 
/Users/davea/.rvm/gems/ruby-2.4.0/gems/activesupport-5.0.2/lib/active_support/cache.rb:300:in `fetch' 
/Users/davea/Documents/workspace/myproject/app/helpers/webpage_helper.rb:116:in `get_cached_content' 
/Users/davea/Documents/workspace/myproject/app/helpers/webpage_helper.rb:73:in `get_url' 
/Users/davea/Documents/workspace/myproject/app/services/abstract_my_object_finder_service.rb:29:in `process_data' 
/Users/davea/Documents/workspace/myproject/app/services/run_crawlers_service.rb:26:in `block (2 levels) in run_all_crawlers' 
/Users/davea/.rvm/gems/ruby-2.4.0/gems/concurrent-ruby-1.0.5/lib/concurrent/executor/ruby_thread_pool_executor.rb:348:in `run_task' 
/Users/davea/.rvm/gems/ruby-2.4.0/gems/concurrent-ruby-1.0.5/lib/concurrent/executor/ruby_thread_pool_executor.rb:337:in `block (3 levels) in create_worker' 
/Users/davea/.rvm/gems/ruby-2.4.0/gems/concurrent-ruby-1.0.5/lib/concurrent/executor/ruby_thread_pool_executor.rb:320:in `loop' 
/Users/davea/.rvm/gems/ruby-2.4.0/gems/concurrent-ruby-1.0.5/lib/concurrent/executor/ruby_thread_pool_executor.rb:320:in `block (2 levels) in create_worker' 
/Users/davea/.rvm/gems/ruby-2.4.0/gems/concurrent-ruby-1.0.5/lib/concurrent/executor/ruby_thread_pool_executor.rb:319:in `catch' 
/Users/davea/.rvm/gems/ruby-2.4.0/gems/concurrent-ruby-1.0.5/lib/concurrent/executor/ruby_thread_pool_executor.rb:319:in `block in create_worker' 

을

캐시에 이러한 개체를 저장하려면 무엇을해야합니까?

Answer 1

사용자 노코 기리의 직렬화 기능 :

$cache = ActiveSupport::Cache::MemoryStore.new 
noko_object = Nokogiri::HTML::Document.new 

serial = noko_object.serialize 
$cache.write(url, serial) 
// Serialized Nokogiri document is now in store at the URL key. 
result = $cache.read(url) 

noko_object = Nokogiri::HTML::Document.new(result) 
// noko_object is now the original document again :) 

Check out the documentation here for more information.

Answer 2

xml을 개체가 아닌 문자열로 저장하고 캐시에서 꺼내면 구문 ​​분석하십시오.

편집 : 의견을 응답 : 응답이

캐시 대신이

nokogiri_object.to_xml 

Edit2가 코멘트합니다. 이 라인을 따라 뭔가. 좀 더 구체적인 도움이 필요하면 더 많은 코드를 게시해야합니다.

nokogiri_object = Nokogiri::XML(cache.fetch('xml_doc')) 

Edit3 : '감사합니다.하지만'캐시에 직렬화 된 객체 저장 '에 대한 코드는 무엇입니까? 나는 "$ cache.fetch (url) {"의 본문이 저장을 처리 한 다음 물건을 검색 할 것이라고 생각했습니다. "

cache.write('url', xml_or_serialized_nokogiri_string)