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require "active_storage/blob"
# Image blobs can have variants that are the result of a set of transformations applied to the original.
class ActiveStorage::Variant
attr_reader :blob, :variation
delegate :service, to: :blob
def initialize(blob, variation)
@blob, @variation = blob, variation
end
def processed
process unless processed?
self
end
def key
"variants/#{blob.key}/#{variation.key}"
end
def url(expires_in: 5.minutes, disposition: :inline)
service.url key, expires_in: expires_in, disposition: disposition, filename: blob.filename
end
private
def processed?
service.exist?(key)
end
def process
service.upload key, transform(service.download(blob.key))
end
def transform(io)
require "mini_magick"
File.open MiniMagick::Image.read(io).tap { |image| variation.transform(image) }.path
end
end
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