'Creating a non-db bool attribute in model

I have a case where I'm defining a non-db attribute in my model:

  def is_preview
    @is_preview = full_url.nil? || 'preview'.in?(full_url)
  end

Now since this is boolean, the Ruby convention is to set it as preview? We're using rubocop so I have to go with the convention, so I keep getting an error here. What is the Ruby way to create a boolean non-db attribute in a model?

ruby-on-railsrubyrubocop


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