How can I get url of image variant in model (outside of controller/view)? Active Storage

Question

I can get url in model with this code (Active Storage)

Rails.application.routes.url_helpers.rails_blob_path(picture_of_car, only_path: true)

But I need to get url of a resized variant

picture_of_car.variant(resize: "300x300").processed

For example this code

Rails.application.routes.url_helpers.rails_blob_path(picture_of_car.variant(resize: "300x300").processed, only_path: true)

throw

NoMethodError (undefined method `signed_id' for #< ActiveStorage::Variant:0x0000000004ea6498 >):

Answer 1

Solution:

Rails.application.routes.url_helpers.rails_representation_url(picture_of_car.variant(resize: "300x300").processed, only_path: true)

Answer provided here.

for a variant you need to use rails_representation_url(variant) - this will build a url similar to the one that rails_blob_url builds but specifically for that variant.