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Instance Public methods
validate_each(record, attr, val)

Source: show | on GitHub 

# File activemodel/lib/active_model/validations/with.rb, line 12
def validate_each(record, attr, val)
  method_name = options[:with]

  if record.method(method_name).arity == 0
    record.send method_name
  else
    record.send method_name, attr
  end
end