Re: ADC Core Data article

FROM : mmalcolm crawford
DATE : Fri Apr 08 23:13:40 2005

On Apr 8, 2005, at 12:48 PM, Scott Ellsworth wrote:

> If foo has no "blob" accessor, then [foo blob] throws a warning at 
> compile time, while [foo valueForKey:@"blob"] does not, instead 
> erroring at runtime.
>

A strategy *some*(*) EOF developers found useful was to define string 
constants for the keys, so instead of valueForKey:@"blob" you would 
have:

Class.h

    extern NSString *blobKey;

Class.m

    NSString *blobKey = @"blob";

then [foo valueForKey:blobKey];

You could also make the key name more specific to a given entity to 
avoid namespace collisions etc...


> This is purely a tool problem - they could write something to check 
> valueForKey at runtime, but they have not done so,


I'm not sure what this means?

mmalc

(*) I fully appreciate that some people don't like this style.  This 
is something about which there will, I suspect, never be consensus. 
If you find it useful, please use it.  If you don't, please don't use 
it.  Could we please not have a big discussion about this...?