サムネ再取得（#193） (#250)

#193

Co-authored-by: miteruzo <miteruzo@naver.com>
Reviewed-on: #250

backend/lib/tasks/sync_nico.rake

@@ -1,10 +1,12 @@
 namespace :nico do
   desc 'ニコニコ DB 同期'
   task sync: :environment do
+    require 'json'
     require 'open3'
     require 'open-uri'
     require 'nokogiri'
     require 'set'
+    require 'time'
 
     fetch_thumbnail = -> url do
       html = URI.open(url, read_timeout: 60, 'User-Agent' => 'Mozilla/5.0').read
@@ -45,16 +47,37 @@ namespace :nico do
     data = JSON.parse(stdout)
     data.each do |datum|
       code = datum['code']
-      post = Post.where('url REGEXP ?', "nicovideo\\.jp/watch/#{ Regexp.escape(code) }([^0-9]|$)")
+
+      post =
+          Post
+          .where('url REGEXP ?', "nicovideo\\.jp/watch/#{ Regexp.escape(code) }([^0-9]|$)")
           .first
+
       title = datum['title']
       original_created_at = datum['uploaded_at'] &&
           Time.strptime(datum['uploaded_at'], '%Y-%m-%d %H:%M:%S')
       original_created_from = original_created_at&.change(sec: 0)
       original_created_before = original_created_from&.+(1.minute)
+
       if post
         attrs = { title:, original_created_from:, original_created_before: }
-        post.update!(attrs) if attrs.any? { |k, v| post.public_send(k) != v }
+
+        unless post.thumbnail.attached?
+          thumbnail_base = fetch_thumbnail.(post.url) rescue nil
+          if thumbnail_base.present?
+            post.thumbnail.attach(
+                io:           URI.open(thumbnail_base),
+                filename:     File.basename(URI.parse(thumbnail_base).path),
+                content_type: 'image/jpeg')
+            attrs[:thumbnail_base] = thumbnail_base
+          end
+        end
+
+        post.assign_attributes(attrs)
+        if post.changed?
+          post.save!
+          post.resized_thumbnail! if post.thumbnail.attached?
+        end
       else
         url = "https://www.nicovideo.jp/watch/#{ code }"
         thumbnail_base = fetch_thumbnail.(url) rescue nil