On Nov 5, 2010, at 15:13, Ayers, Joseph wrote:
> I have a core data model that has a series of to-many relationships of the
> type:
>
> @interface TapeList : NSManagedObject
> {
> NSString * ListURL;
> NSSet* tapes;
> }
>
> @interface tapes : NSManagedObject
> {
> NSString * Notes;
> NSString * TapeName;
> NSSet * VideoClip;
> }
>
> @interface VideoClip : NSManagedObject
> {
> NSString * StartTimeCode;
> QTMovie * mMovie;
> NSString * EndTimeCode;
> NSString * Notes;
> NSString * movieURL;
> tapes * CurrentTape;
> NSSet* Table;
> }
>
> @interface Table : NSManagedObject
> {
> NSString * Notes;
> NSString * Name;
> NSSet* CommandStates;
> NSSet* Flexions;
> NSSet* DataSources;
> }
>
> A reference to tapeList.tapes works fine, but a reference to
> tapeList.tapes.VideoClip gives me a
> "request for member "VideoClip in something not a structure or union" compile
> time error.
I think you've got something wrong here, but there are 2 possibilities for what
it is. Choose A or B, if either applies. :)
A. With your declarations, 'tapeList.tapes' is a NSSet. The set doesn't have a
"VideoClio" property (though its members do), and the compiler is correctly
telling you that you can't refer to such a property. *Which* 'tapes' object are
you trying to refer to?
B. This is not how you use properties in Core Data -- you do NOT declare
instance variables corresponding to the properties in your data model. Instead,
those properties are defined for you by Core Data. You *do* have to supply
property declarations to keep the compiler happy (as described in the Core Data
documentation).
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