ruby on rails - How to use carrierwave to process an image that was directly uploaded to Amazon s3? -

i have client upload image directly s3 javascript , have designed url if carrierwave uploading (by using unique_id pass create method). once image uploaded, want send ajax request create record, , process image using carrierwave, don't need carrierwave handle upload, process versions.

i have typical carrierwave setup using fog gem s3 storage:

class picture < activerecord::base   mount_uploader :image, imageuploader   # . . . end 

and this:

class imageuploader < carrierwave::uploader::base   include carrierwave::rmagick    storage :fog    def store_dir     "uploads/picture/#{model.unique_id}"   end    version :large     resize_to_limit(600, 600)   end    # . . .  end 

but can't figure out how create new picture without carrierwave wanting handle upload.

i have tried setting picture.image filename becomes nil:

>> picture.create(image: params[:filename], unique_id: params[:unique_id]) => #<picture id: 96, image: nil, ... > 

i have tried getting image using carrierwave's "uploading files remote location" feature:

class picturescontroller < applicationcontroller                                                                                     def create     @picture = picture.create(       remote_image_url: params[:url],       unique_id: params[:unique_id]     )     # . . .     end   # . . . end 

that works eventually, lot of downloading , uploading , feels wrong.

how create picture without carrierwave getting involved, , have carrierwave process image versions?