db/seeds/seed_helpers.rb


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class ActiveRecord::Base
  def self.seed_by(key_attribute, &block)
    model = find_or_create_by! key_attribute
    print "Seed #{name} #{key_attribute.inspect} "
    yield model

    puts "[#{(model.changed? ? 'updated' : 'no change')}]"
    model.save!

    model
  end
end