无法从对象创建BOOL

Question

我正在按照mac os x第4版的指导cocoa编程。在第32章中，我弄糟了代码，而且我没有对它进行备份，所以我不得不从下载大的解决方案书呆子牧场。
该项目是关于核心数据关系的，有一个Employee类和一个Class类。

Employee.h：

#import <Foundation/Foundation.h> 
#import <CoreData/CoreData.h> 

@class Department; 

@interface Employee : NSManagedObject 

@property (nonatomic, copy) NSString * firstName; 
@property (nonatomic, copy) NSString * lastName; 
@property (nonatomic, retain) Department *department; 
@property (nonatomic, readonly) NSString *fullName; 

@end 

Employee.m：

#import "Employee.h" 
#import "Department.h" 


@implementation Employee 

@dynamic firstName; 
@dynamic lastName; 
@dynamic department; 

+ (NSSet *)keyPathsForValuesAffectingFullName 
{ 
    return [NSSet setWithObjects:@"firstName", @"lastName", nil]; 
} 

- (NSString *)fullName 
{ 
    NSString *first = [self firstName]; 
    NSString *last = [self lastName]; 
    if (!first) 
     return last; 
    if (!last) 
     return first; 
    return [NSString stringWithFormat:@"%@ %@", first, last]; 
} 

@end 

Department.h：

#import <Foundation/Foundation.h> 
#import <CoreData/CoreData.h> 


@interface Department : NSManagedObject 

@property (nonatomic, retain) NSString * deptName; 
@property (nonatomic, retain) NSSet *employees; 
@property (nonatomic, retain) NSManagedObject *manager; 
@end 

@interface Department (CoreDataGeneratedAccessors) 

- (void)addEmployeesObject:(NSManagedObject *)value; 
- (void)removeEmployeesObject:(NSManagedObject *)value; 
- (void)addEmployees:(NSSet *)values; 
- (void)removeEmployees:(NSSet *)values; 

@end 

Department.m：

#import "Department.h" 
#import "Employee.h" 

@implementation Department 

@dynamic deptName; 
@dynamic employees; 
@dynamic manager; 

- (void)addEmployeesObject:(Employee *)value 
{ 
    NSLog(@"Dept %@ adding employee %@", 
      [self deptName], [value fullName]); 
    NSSet *s = [NSSet setWithObject:value]; 
    [self willChangeValueForKey:@"employees" 
       withSetMutation:NSKeyValueUnionSetMutation 
        usingObjects:s]; 
    [[self primitiveValueForKey:@"employees"] addObject:value]; 
    [self didChangeValueForKey:@"employees" 
       withSetMutation:NSKeyValueUnionSetMutation 
        usingObjects:s]; 
} 

- (void)removeEmployeesObject:(Employee *)value 
{ 
    NSLog(@"Dept %@ removing employee %@", 
      [self deptName], [value fullName]); 
    Employee *manager = (Employee *)[self manager]; 
    if (manager == value) { 
     [self setManager:nil]; 
    } 
    NSSet *s = [NSSet setWithObject:value]; 
    [self willChangeValueForKey:@"employees" 
       withSetMutation:NSKeyValueMinusSetMutation 
        usingObjects:s]; 
    [[self primitiveValueForKey:@"employees"] removeObject:value]; 
    [self didChangeValueForKey:@"employees" 
       withSetMutation:NSKeyValueMinusSetMutation 
        usingObjects:s]; 
} 


@end 

我有这些核心数据relashionships和实体：

我也使用一些阵列控制器到核心数据值绑定到一些出口。
完整的项目可以在“下载解决方案”中找到here。，第32章（与我的相同）。 告诉我，如果你需要更多的代码来理解这个错误：

2012-10-31 15:27:43.977 Departments[1229:303] Cannot create BOOL from object (
) of class _NSControllerArrayProxy 
2012-10-31 15:27:43.989 Departments[1229:303] Cannot create BOOL from object (
) of class _NSControllerArrayProxy 

好像张贴整个项目是不推荐，但我可以这样做，如果你说这是好的。 PS：我使用从解决方案下载的代码，它是一样的，但它不起作用，也许是因为我有更高版本的xcode。

Answer 1

看起来像一个绑定问题。你可能有一个“启用”或“隐藏”的绑定（需要一个BOOL）与一个无法转换为BOOL的属性链接。