Question

我发现用户有一个sm_owner字段。但是如何让用户使用sm_owner。我的代码是这样的：

    [self.client getLoggedInUserOnSuccess:^(NSDictionary *result) {
        NSString *currentLogginedUser = [result valueForKey:@"sm_owner"];
        NSFetchRequest *request = [[NSFetchRequest alloc] init];
        NSEntityDescription *entity = [NSEntityDescription entityForName:@"User" inManagedObjectContext:self.managedOjbectContext];
        [request setEntity:entity];
        NSPredicate *predicate = [NSPredicate predicateWithFormat:@"sm_owner like user/%@", currentLogginedUser];
        [request setPredicate:predicate];
        self.user = [[self.managedOjbectContext executeFetchRequest:request error:nil] objectAtIndex:0];
    } onFailure:^(NSError *error) {

    }];

崩溃消息是：原因：'谓词的未实现的SQL生成（sm_owner LIKE用户/“用户/测试”）'

Answer 1

我是StackMob的平台传播者。

getLoggedInUserOnSuccess方法的结果通常包含主键“username”。所以下面的代码应该可以工作。

[self.client  getLoggedInUserOnSuccess:^(NSDictionary *result) {                
    NSString *currentLogginedUser = [result objectForKey:@"username"];

    NSFetchRequest *request = [[NSFetchRequest alloc] init];
    NSEntityDescription *entity = [NSEntityDescription entityForName:@"User" inManagedObjectContext:self.managedOjbectContext];
    [request setEntity:entity];

    NSPredicate *predicate = [NSPredicate predicateWithFormat:@"username == %@", currentLogginedUser];
    [request setPredicate:predicate];
    self.user = [[self.managedOjbectContext executeFetchRequest:request error:nil] objectAtIndex:0];
} onFailure:^(NSError *error) {

}];

或者，如果您更喜欢从NSDictionary结果中获取sm_owner。我会做以下几点。

NSString *sm_owner = [result valueForKey:@"sm_owner"];

NSArray *myArray = [sm_owner componentsSeparatedByString:@"/"];
NSString *currentLogginedUser = [myArray objectAtIndex:1];

然后执行你的获取。

如何使用StackMob作为后端获取sm_owner User对象

1 个答案: