CTPersistanceRecord setValue:forKey:报错

[lumouren009]

- (BOOL)setPersistanceValue:(id)value forKey:(NSString *)key
{
    BOOL result = YES;
    NSString *setter = [NSString stringWithFormat:@"set%@%@:", [[key substringToIndex:1] capitalizedString], [key substringFromIndex:1]];
    if ([self respondsToSelector:NSSelectorFromString(setter)]) {
        if ([value isKindOfClass:[NSString class]]) {
            [self setValue:[value safeSQLDecode] forKey:key];
        } else if ([value isKindOfClass:[NSNull class]]) {
            [self setValue:nil forKey:key];
        } else {
            [self setValue:value forKey:key];
        }
    } else {
        result = NO;
    }

    return result;
}

在判断 [value isKindOfClass:[NSNull class]]分支里，value被设置为nil,导致crash

could not set nil as the value for the key 

情景：
新建migratorStep，实现

- (void)goUpWithQueryCommand:(CTPersistanceQueryCommand *)queryCommand error:(NSError *__autoreleasing *)error
{
  [[queryCommand addColumn:@"uploadFinishDate" columnInfo:@"INTEGER" tableName:@"LocalMovieTable"] executeWithError:error];
}

数据库中增加一个INTEGER类型的字段。数据库升级之后，由于新添字段，所以会走[value isKindOfClass:[NSNull class]]的分支，然而，这里uploadFinishDate并不是id类型，导致出错。

[lumouren009]

这里我暂时的解决办法是把uploadFinishDate改成NSNumber类型

[casatwy]

你原来的uploadFinishDate是什么类型？

发自我的 iPhone

[casatwy]

如果是数字的内容，应该永远都使用NSNumber

[lumouren009]

原来的uploadFinishDate是unsigned long 类型