_define_before_model_callback(klass, callback) private

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# File activemodel/lib/active_model/callbacks.rb, line 124
      def _define_before_model_callback(klass, callback)
        klass.define_singleton_method("before_#{callback}") do |*args, &block|
          set_callback(:"#{callback}", :before, *args, &block)
        end
      end
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