找到在rails上使用redis緩存的最佳方法

Question

我嘗試使用Redis緩存在rails上，但在嘗試緩存多語言時遇到了挑戰。 因為我的Redis需要使用table_translations進行緩存

我嘗試了一些代碼，但我不認為這是最好的方法

我有實例變量來使用Erb模板

def index
  @posts = fetch_posts
  @translations = fetch_translations

  puts @posts
  puts @translations
end

和Redis這樣取

private
  def fetch_posts
    begin
      posts = $redis.get "posts"

      if posts.nil?
        posts = []

        Post.all.order("id ASC").each do |post|
          posts << post
        end

        posts = posts.to_json

        $redis.set "posts", posts
      end

      posts = JSON.load posts
    rescue => error
      puts error.inspect
      posts = Post.all
    end
    posts
  end

  def fetch_translations
    begin
      translations = $redis.get "translations"

      if translations.nil?

        translations = []

        Post.all.order("id ASC").each do |post|
          post.translations.order("locale ASC").each do |translation|
            translations << translation
          end
        end

        translations = translations.to_json

        $redis.set "translations", translations
      end

      translations = JSON.load translations
    rescue => error
      puts error.inspect
      translations = Post.all
    end
    translations
  end

我這樣做是因為我需要獲得帖子的所有語言版本，所以我為翻譯制作了Redis密鑰

和我的輸出：

{"id":1,"slug":"hello-world","thumb_url":"thumbs/null","thumb_file_name":null,"thumb_content_type":null,"thumb_file_size":null,"thumb_updated_at":null,"featured":false,"hidden":false,"created_at":"2019-04-18T07:05:09.117Z","updated_at":"2019-04-18T07:27:55.830Z"}
{"title":"Xin chao","description":"Day la bai viet dau tien, duoc viet tu rails CMS","body":"xin chao cac ban"}
{"title":"Hello World","description":"This is first post from rails CMS","body":"Hello every body"}

我找到了將輸出變為密鑰的最佳解決方案，如下所示：

{"id":1,"slug":"hello-world","thumb_url":"thumbs/null","thumb_file_name":null,"thumb_content_type":null,"thumb_file_size":null,"thumb_updated_at":null,"featured":false,"hidden":false,"created_at":"2019-04-18T07:05:09.117Z","updated_at":"2019-04-18T07:27:55.830Z","title":"Xin chao","description":"Đay la bai viet đau tien, đuoc viet tu rails CMS","body":"xin chao cac ban"}
{"id":1,"slug":"hello-world","thumb_url":"thumbs/null","thumb_file_name":null,"thumb_content_type":null,"thumb_file_size":null,"thumb_updated_at":null,"featured":false,"hidden":false,"created_at":"2019-04-18T07:05:09.117Z","updated_at":"2019-04-18T07:27:55.830Z",title":"Hello World","description":"This is first post from rails CMS","body":"Hello every body"}

我的代碼可以正常工作，但我需要你的幫助才能讓它變得更好，請幫助我提高我的技能

謝謝您幫忙

Answer 1

您可以使用內置的Rails緩存處理程序，這樣您就不需要處理.nil? 調用緩存鍵。

  private

  def fetch_posts
    posts = Rails.cache.fetch("posts") do
      begin
        Post.all.order("id ASC").as_json
      rescue => error
        puts error.inspect
        Post.all
      end
    end
    posts
  end

  def fetch_translations
    translations = Rails.cache.fetch("translations") do
      begin
        Post.all.order("id ASC").map do |post|
          post.translations.order("locale ASC").as_json
        end.flatten
      rescue => error
        puts error.inspect
        Post.all
      end
    end
    translations
  end

Answer 2

我發現解決方案遵循這個原則如何在Ruby中將數組添加到另一個數組而不是最終得到多維結果？

概念是將兩個數組中的所有attr展平，然后將其再次哈希到新數組中

def fetch_posts
  posts = []

  Post.all.order("id ASC").each do |post|
    post.translations.each do |translation|
      posts << [*post.attributes.slice('slug','thumb_url'),*JSON.parse(translation.to_json)].to_h
    end
  end
end

希望這個幫助對任何人都有同樣的問題:)