Thanks for the responses. I've collated them together
The order in which the values are retrieved is important therefore
I was attempting to create a NSArray instance variable to store an
ordered list of managed objects.
How are you intending to use and store the array?
Is there any attribute on which you could simply sort the input
characteristic types?
The order of the objects is only important when the program is
executed. Values from the objects are fed into a external library.
Therefore, I have no desire to add an additional variable to the
managed object model.
from source file:
inputCharacteristicTypes = [NSArray arrayWithArray:[[self
mutableSetValueForKey:@"inputCharacteristicTypes"] allObjects]];
This is unnecessarily inefficient.
There is no need to create a mutable proxy
('mutableSetValueForKey:') since you don't use it; 'allObjects'
returns a new array, so there is no need to create another array
using it.
Fair point.
A few things are not clear to me.
What is this entity CharacteristicType?
A sub-classed managed object that implements a few custom methods.
The error message implies that a binding is involved. What is this
binding?
I didn't think any bindings were involved...
The error massage also implies that the CharacteristicType entity is
an NSArray. Is there an declaration error that says that the entity
instance is an array?
The CharacteristicType entity was supposed to be a managed object...
This all got me thinking that maybe I'd missed something...
This morning I realised that that the error was actually a result of
the name I'd given the instance variable. The variable name,
inputCharacteristicTypes, matched one of the relationships of the
managed object which was causing all the trouble. I'm guessing that
after running through the method which defined the
inputCharacteristicTypes NSArray the program refreshed the UI,
causing a binding to fire. However, instead of finding an NSSet for
the relationship via key-value coding my program returned the newly
defined NSArray causing an error.
After fixing this error everything works.
Cheers
Tim
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