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

Answer 1

Following the documentation at https://api.rubyonrails.org/classes/ActiveStorage/Variant.html it should be: picture_of_car.variant(resize: [300, 300]).processed.service_url

Answer 2

variant = picture_of_car
            .variant(resize: '300x300')
            .processed 

variant.service.send(:path_for, variant.key) # Absolute path to variant file

Answer 3

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.