ios - 如何在 iOS 的 Realm 中使用主键( objective-c )

Question

我将电子邮件声明为 Realm 模型中的主键。

+ (NSString *)primaryKey
{
   return @"email";
}


- (void)insertUserWithFirstName:(NSString*)firstname lastName:     (NSString*)lastname email:(NSString*)email address:(NSString*)address gender:(NSString*)gender mobile:(NSString*)mobile department:(NSString*)department
{
   RLMRealm *realm = [RLMRealm defaultRealm];
   [realm beginWriteTransaction];

   Employee *employeeInfo = [[Employee alloc]init];
   employeeInfo.firstName = firstname;
   employeeInfo.lastName = lastname;
   employeeInfo.email = email;
   employeeInfo.address = address;
   employeeInfo.gender = gender;
   employeeInfo.mobile = mobile;
   employeeInfo.department = department;

   [realm addObject:employeeInfo];
   [realm commitWriteTransaction];
}

输入重复的电子邮件后应用崩溃。

Terminating app due to uncaught exception 'RLMException', reason: 'Can't set primary key property 'email' to existing value .

如何在 Realm 中使用主键？

如何防止这种崩溃？

请帮帮我。

Answer 1

使用try...catch来处理异常

    RLMRealm *realm = [RLMRealm defaultRealm];
    @try {
             [realm beginWriteTransaction];

             Employee *employeeInfo = [[Employee alloc]init];
             employeeInfo.firstName = firstname;
             employeeInfo.lastName = lastname;
             employeeInfo.email = email;
             employeeInfo.address = address;
             employeeInfo.gender = gender;
             employeeInfo.mobile = mobile;
             employeeInfo.department = department; 
             [realm addObject:employeeInfo];  // [realm addOrUpdateObject:employeeInfo];
             [realm commitWriteTransaction];
     }
     @catch (NSException *exception) {
         NSLog(@"exception");
         if ([realm inWriteTransaction]) {
            [realm cancelWriteTransaction];
         }
     }

正如@Konstantin 所建议的，您还可以使用 [realm addOrUpdateObject:employeeInfo]; 来使用主键更新您的数据...