Find a best way to work with redis cache on rails

Question

I try to use Redis to cache on rails, but I get a challenge when trying to cache multi-language. Because my Redis needs to be cached with table_translations

I try with some code, but I don't think this is the best way

I have the instance variable to work with Erb template

def index @posts = fetch_posts @translations = fetch_translations puts @posts puts @translations end

and Redis fetch like this

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

I do that because I need to get all language version of a post, so I make a Redis key for translate

and my output:

{"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"}

I find the best solution to make my output into a key, like this:

{"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"}

My code can work correctly, but I need your help to make it better, please help me to improve my skills

Thank for your help

ErvalhouS · Accepted Answer · 2019-04-18 11:53:51Z

You can use the built in Rails cache handler, this way you won't need to handle .nil? calls to cache keys.

 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

thank your stuff @ErvalhouS :) i will try Rails cache for other cases

Tho Nguyen · Accepted Answer · 2019-04-19 07:00:44Z

I found the solution by follow this stuff How do you add an array to another array in Ruby and not end up with a multi-dimensional result?

concept is flatten all attr in two array and then Hash again this into new array

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

Hope this help to anyone have question same to me :)

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