mutation_sorbet.rb

class AddTeacherToSite < TypedMutation
  class Args < T::Struct
    const :site, Site
    const :teacher, Teacher
  end
  
  def policy
    # pass the privacy policy required
  end
 
  def commit
    # use passed in args to perform the update
  end
end

# no longer need to to validate args
AddTeacherToSite.new(
  viewer,
  AddTeacherToSite::Args.new(site:…, teacher:…)
).execute!