I think that discussions about validation of user entered data need to consider 
how you provide feedback to the user on what happened.  

Have you thought about how validation errors are integrated with Cocoa 
frameworks?  I don't know anything about Virtus or SmartProperties but I would 
be surprised if they buy you anything when used in conjunction with a Cocoa 
user interface.  Cocoa provides formatters.  Take a look at "Text Field with 
Number Formatter" in the Xcode controls.

Steve

On 22 Nov 2012, at 06:47, Colin Thomas-Arnold <coli...@gmail.com> wrote:

> What happens if you use BOTH attr_accessor and attribute - the first for the 
> IB outlet, and the other for validation. Just a thought. 
> 
> 
> On Nov 21, 2012, at 11:08 PM, david kramf <dakr....@gmail.com> wrote:
> 
>> "Basically, I need to make sure that when I ask for an integer, I get an 
>> integer. And when I want a string - I can reject anything but strings."
>> Can't you use Ruby services like is_a? to force it ?
>> Thanks, David Kramf
>> On Nov 21, 2012, at 10:04 PM, Carolyn Ann Grant wrote:
>> 
>>> Basically, I need to make sure that when I ask for an integer, I get an 
>>> integer. And when I want a string - I can reject anything but strings.
>> 
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