Uploading a remote file url from Rails Console with Carrierwave

Take a look at the ‘Uploading files from a remote location‘ section on this page https://github.com/carrierwaveuploader/carrierwave

CarrierWave should throw an error if the url of the location is invalid

2.1.3 :015 > image.remote_image_url = "http"
 => "http"
2.1.3 :016 > image.save!
   (0.2ms)  BEGIN
   (0.2ms)  ROLLBACK
ActiveRecord::RecordInvalid: Validation failed: Image trying to download a file which is not served over HTTP

Or if it’s an unknown host:

2.1.3 :017 > image.remote_image_url = "http://foobar"
=> "http://foobar"
2.1.3 :018 > image.save!
   (0.4ms)  BEGIN
   (0.4ms)  ROLLBACK
ActiveRecord::RecordInvalid: Validation failed: Image could not download file: getaddrinfo: nodename nor servname provided, or not known

Please also note that if you want to download remote images you should prefix the attribute with remote_ and suffix it with _url, as shown in the example