saving a gravatar to activeStorage

Question

the following cUrl command in the console, as per gravatar instructions saves an image to the directory it is being called from

curl "https://www.gravatar.com/avatar/ZUETpSoXKBP5VXW4qQnQFIZcLpxh5Ix2?d=identicon" --output 'temp_avatar'

However, in order to avoid hitting their server, the goal is to have an action save the output via ActiveStorage

class UserPreference < ApplicationRecord
  has_one_attached :identicon

and the controller action

    if !current_user.user_preference.identicon.present?
      puts 'identicon absent'
      result = Net::HTTP.get_response(URI.parse("https://www.gravatar.com/avatar/#{current_user.virtual_qr_code}.jpg?d=identicon --output '#{current_user.id}_avatar' "))
      puts result.inspect
       current_user.user_preference.identicon.attach(result)

the result is a bit perplexing. The puts commands get a response, but a different one from the processing of cUrl straight out

identicon absent
#<Net::HTTPFound 302 Found readbody=true>

Could not find or build blob: expected attachable, got #<Net::HTTPFound 302 Found readbody=true>

What is mistaken in expecting the image output to be different when called via Net::HTTP?
How should this be called to save via ActiveStorage?

Answer 1

It looks like you've included some of the CURL command into the URL of the Net::HTTP call, and are trying to call this string as an URL "https://www.gravatar.com/avatar/#{current_user.virtual_qr_code}.jpg?d=identicon --output '#{current_user.id}_avatar' " where you actually wanted: "https://www.gravatar.com/avatar/#{current_user.virtual_qr_code}.jpg?d=identicon"

You cannot use --output from within the URL, but you should use the returned body of the GET request instead.

    if !current_user.user_preference.identicon.present?
      puts 'identicon absent'
      result = Net::HTTP.get_response(URI.parse("https://www.gravatar.com/avatar/#{current_user.virtual_qr_code}.jpg?d=identicon"))
      puts result.inspect #=> Net::HTTPResponse object

      # result.body will return the actual content of the HTTP request, instead of the Net::HTTPResponse object.
      current_user.user_preference.identicon.attach(result.body)