From: Gregory Millam <walker@...>
Date: 2004-06-05T03:48:07+09:00
Subject: Re: Check assertion in Ruby

Received: Sat, 5 Jun 2004 03:34:47 +0900
And lo, Edgardo wrote:

> Hi, everybody. I would like to use an assert like function to test the 
> number of rows returned by a query. Something like Eiffel's
> 
> check result.num_rows = 1
> 
> What's the best way to do that in Ruby?
> 

result.num_rows == 1 or raise "num_rows is not 1"

is equivalent to

raise "num_rows is not 1" unless result.num_rows == 1

The 'or/and' method is idiomatic, while the 'if/unless' is more readable.

- Greg