When grabbing the url of an ActiveStorage record through any of these methods:
ActiveStorage::Preview#url you may find yourself running into this error:
Cannot generate URL for <FILENAME> using Disk service, please set ActiveStorage::Current.url_options.
This can be resolved in the controller by utilizing a concern that ActiveStorage provides for us;
It would look like this in your controller:
class MyController < ApplicationController include ActiveStorage::SetCurrent # The rest of your controller... end
And now whenever you go to call
#url on your ActiveStorage record, it will know where to generate the url from!
ActiveStorage::SetCurrent sets the
ActiveStorage::Current.url_options hash to match the current request.