Get all from table AND sort?

Using the following code in my controller, I am able to retrieve all rows from my table, but it won't sort by the column last_name. Any sug开发者_JAVA技巧gestions?

 @pi_names = PiName.all(:order => 'pi_names.last_name DESC')

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Try

 @pi_names = PiName.order('pi_names.last_name DESC').all

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Alternative syntax allowing any errors to potentially be caught prior to runtime:

@pi_names = PiName.order(last_name: :desc)