activestorage/lib/active_storage/attached.rb


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require "action_dispatch"
require "action_dispatch/http/upload"
require "active_support/core_ext/module/delegation"

module ActiveStorage
# Abstract baseclass for the concrete ActiveStorage::Attached::One and ActiveStorage::Attached::Many
# classes that both provide proxy access to the blob association for a record.
  class Attached
    attr_reader :name, :record

    def initialize(name, record)
      @name, @record = name, record
    end

    private
      def create_blob_from(attachable)
        case attachable
        when ActiveStorage::Blob
          attachable
        when ActionDispatch::Http::UploadedFile, Rack::Test::UploadedFile
          ActiveStorage::Blob.create_after_upload! \
            io: attachable.open,
            filename: attachable.original_filename,
            content_type: attachable.content_type
        when Hash
          ActiveStorage::Blob.create_after_upload!(attachable)
        when String
          ActiveStorage::Blob.find_signed(attachable)
        else
          nil
        end
      end
  end
end

require "active_storage/attached/one"
require "active_storage/attached/many"
require "active_storage/attached/macros"