Rails other/remaining scopes

color.rb

# frozen_string_literal: true

class Color < ApplicationRecord
  scope :red, -> { where(color: 'red') }
  scope :yellow, -> { where(color: 'yellow') }
  scope :blue, -> { where(color: 'blue') }
  scope :non_primary, -> { where.not(id: red).where.not(id: yellow).where.not(id: blue) }
end