Fetch remote image using http.rb (#3114)

app/models/media_attachment.rb

@@ -46,6 +46,9 @@ class MediaAttachment < ApplicationRecord
                     styles: ->(f) { file_styles f },
                     processors: ->(f) { file_processors f },
                     convert_options: { all: '-quality 90 -strip' }
+
+  include Remotable
+
   validates_attachment_content_type :file, content_type: IMAGE_MIME_TYPES + VIDEO_MIME_TYPES
   validates_attachment_size :file, less_than: 8.megabytes
 
@@ -59,10 +62,6 @@ class MediaAttachment < ApplicationRecord
     remote_url.blank?
   end
 
-  def file_remote_url=(url)
-    self.file = URI.parse(Addressable::URI.parse(url).normalize.to_s)
-  end
-
   def to_param
     shortcode
   end