问题描述

实体关系的问题（核心数据）

有两个UserInfo和Department实体，一个是一对一关系，另一个是一对多关系，在应用中运行之后就出现这个：

 Undefined symbols for architecture i386:_OBJC_METACLASS_$_NSManagedObject"" referenced from:      _OBJC_METACLASS_$_Department in Department.o      _OBJC_METACLASS_$_UserInfo in UserInfo.o_OBJC_CLASS_$_NSManagedObject"" referenced from:      _OBJC_CLASS_$_Department in Department.o      _OBJC_CLASS_$_UserInfo in UserInfo.old: symbol(s) not found for architecture i386clang: error: linker command failed with exit code 1 (use -v to see invocation)

// Department.h

#import <Foundation/Foundation.h>#import <CoreData/CoreData.h>@class UserInfo;@interface Department : NSManagedObject@property (nonatomic retain) NSString * id;@property (nonatomic retain) NSString * post;@property (nonatomic retain) NSSet *user;@end@interface Department (CoreDataGeneratedAccessors)- (void)addUserObject:(UserInfo *)value;- (void)removeUserObject:(UserInfo *)value;- (void)addUser:(NSSet *)values;- (void)removeUser:(NSSet *)values;@end

// Department.m

#import ""Department.h""#import ""UserInfo.h""@implementation Department@dynamic id;@dynamic post;@dynamic user;@end

解决方案

你看看这个报错集合：
http://blog.csdn.net/newpact/article/details/8460960

解决方案二：
http://www.cnblogs.com/lovekarri/archive/2013/03/06/2945620.html