如何获取sm_owner用户对象使用StackMob作为后端 [英] How to get the sm_owner User object using StackMob as backend
问题描述
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:
I find out the User has a sm_owner field. But how do I get the user using sm_owner. My code is like this:
[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:reason:'谓词的未实现的SQL生成(sm_owner LIKE user /user / test)'
And the crash message is:reason: 'Unimplemented SQL generation for predicate (sm_owner LIKE user / "user/test")'
推荐答案
我是StackMob的平台Evangelist。
I'm the platform Evangelist for StackMob.
getLoggedInUserOnSuccess方法的结果通常包含主键username。所以下面的代码应该工作。
The result from the getLoggedInUserOnSuccess method normally contains primary key "username". So the following code should work.
[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,如果你更喜欢从NSDictionary结果中获取sm_owner。我会做以下。
Alternatively, if you rather grab the sm_owner from the NSDictionary result. I would do the following.
NSString *sm_owner = [result valueForKey:@"sm_owner"];
NSArray *myArray = [sm_owner componentsSeparatedByString:@"/"];
NSString *currentLogginedUser = [myArray objectAtIndex:1];
然后执行您的提取操作。
Then perform your fetch.
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