新建实训默认描述图片无法显示

db/migrate/20190713022300_modify_md_attachment_url_for_md_cotents.rb

@@ -26,5 +26,10 @@ class ModifyMdAttachmentUrlForMdCotents < ActiveRecord::Migration[5.2]
     subjects.find_each do |s|
       s.update_column(:description, s.description.gsub("![](/attachments/download", "![](/api/attachments")) if s.description.present?
     end
+
+    plats = PlatformSample.where(samples_type: ['introduction', 'knowledge'])
+    plats.find_each do |p|
+      p.update_column(:contents, p.introduction.gsub("![](/attachments/download", "![](/api/attachments")) if p.introduction.present?
+    end
   end
 end