Shrine

class Photo < Sequel::Model  include Shrine::Attachment(:image) end

photo = Photo.create(image: file) photo.image #=> #<Shrine::UploadedFile> photo.image_url #=> "https://my-bucket.s3.amazonaws.com/6bfafe89748ee135.jpg" photo.image.id #=> "6bfafe89748ee135.jpg" photo.image.storage #=> #<Shrine::Storage::S3> photo.image.metadata #=> { "size" => 749238, "mime_type" => "image/jpeg", "filename" => "nature.jpg" }

Shrine::Attacher.derivatives :thumbnails do |original|  magick = ImageProcessing::MiniMagick.source(original)  { large: magick.resize_to_limit!(800, 800),  medium: magick.resize_to_limit!(500, 500),  small: magick.resize_to_limit!(300, 300) } end

photo.image_derivatives #=> # { large: #<Shrine::UploadedFile id="4ed847866c71a5bf.jpg" ...>, # medium: #<Shrine::UploadedFile id="7bc41b1c24afe81d.jpg" ...>, # small: #<Shrine::UploadedFile id="cccdd4052261633b.jpg" ...> }

Shrine.derivation :thumbnail do |file, width, height|  magick = ImageProcessing::MiniMagick.source(original)  magick.resize_to_limit!(width.to_i, height.to_i) end

photo.image.derivation_url(:thumbnail, 600, 400) #=> ".../thumbnail/600/400/eyJpZCI6ImZvbyIsInN0b3JhZ2UiOiJzdG9yZSJ9?signature=..."