:processor # Sets the image processor to use for resizing of the attached image.
# Options include ImageScience, Rmagick, and MiniMagick. Default is whatever is installed.
:uuid_primary_key # If your model's primary key is a 128-bit UUID in hexadecimal format, then set this to true.
+ :association_options # attachment_fu automatically defines associations with thumbnails with has_many and belongs_to. If there are any additional options that you want to pass to these methods, then specify them here.