ruby on rails - Carrierwave thumb method doesn't work for remote image url -

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i have model 2 fields img_file (to load computer) , img_url (to load remotely internet). have standart thumb method in ulpoader. 

 version :thumb    process :resize_to_fit => [50, 50]  end

the problem that, when call method img_file works, doesn't img_url.

here code:

f.inputs    f.input :project_id, as: :select, collection: project.all {|p| [p.title]}    f.input :img_file, as: :file, hint: image_tag(f.object.img_file.thumb)    f.input :img_url end

this how call thumb method both:

column :img_file |photo|   image_tag photo.img_file.thumb end  column :img_url |photo|   image_tag photo.img_url.thumb end

it seems silly question, i'm stuck with. hope, see problem. thanks!


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