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mastodon/app/models/concerns/attachmentable.rb

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# frozen_string_literal: true
module Attachmentable
extend ActiveSupport::Concern
included do
before_post_process :set_file_extensions
end
private
def set_file_extensions
self.class.attachment_definitions.each_key do |attachment_name|
attachment = send(attachment_name)
next if attachment.blank?
extension = Paperclip::Interpolations.content_type_extension(attachment, :original)
basename = Paperclip::Interpolations.basename(attachment, :original)
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attachment.instance_write :file_name, [basename, extension].delete_if(&:blank?).join('.')
end
end
end