Question

I have a bizarre problem with a ‘double’ property in Core Data.
I have isolated the problem in these two lines:

newStrategy.order = 444.0; 
NSLog(@"Order is %f", newStrategy.order);

The output of that NSLog is:

Order is nan

newStrategy type is ‘Strategy’, one of the entities I have defined in Core Data. The ‘order’ property is declared as

@property (nonatomic) double order;

in a Core Data generated file.

Of course, when data is saved, the ‘order’ is not stored as 444.0. The strange situation is that I have other Core Data entities (with associated files) that use a similar ‘order’ property, as a double, and they gave me no problems at all in similar operations.

Any idea? Thanks in advance.

Answer 1

Some inconsistency in the Core Data model was the cause, so recreating the attribute helps. I changed it from ‘double’ to ‘float’, in the model and in the .h files. Then, I went back to a ‘double’ again and now it’s working.