Rails回形针将图像从URL保存到数据库

Question

I have a Rails app with underlying MySQL database containing many products. Each product has a picture, which is currently stored in the database as URL.

How can I save these with paperclip on S3. How do I store the filename in my MySQL database? And how do I trigger the refresh, once I updated my database with hundreds of new products?

Thanks a lot for help!

Answer 1

You will need to download the image from the url and let paperclip do the reprocessing for you. You can find code to download the image on paperclip's wiki https://github.com/thoughtbot/paperclip/wiki/Attachment-downloaded-from-a-URL

For the sake of the example, let's say you have Users with avatars, rather than products with images and the existing field is old_avatar_url . Setup User to store an avatar, as instructed by paperclip .

User.find_each do |user|
  user.avatar_remote_url = user.old_avatar_url
  user.save
end

After than you can safely remove the old_avatar_url column.