amazon s3 - Downloading object from S3 through rails not knowing the exact key -


i have simple rails application user can upload , download file s3. example: in /avatar/caid/uuid, there 1 file named uuid.png uploaded user. next, user must able download particular file s3, however, @ time, doesn't know exact name of file saved in s3. knows file save in /avatar/caid/uuid. question how can download file /avatar/caid/uuid folder? tried option below:

resp = s3.get_object( bucket: "xxx", key: "avatar/123/456/pic.bmp", )

however, option above assumes have know exact name of file pic.bmp. may know how can download file pic.bmp knowing 

url" "avatar/123/456" ?

thanks


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