Question

我一直在使用sql，现在我正在使用解析。我遇到了有关数据库结构的问题。我有2个对象叫做商店和用户。我已经将商店objectId添加到每个用户，以便我可以识别哪个用户是哪个商店。我不知道是否还有其他办法，但这是我能想到的。

问题是我想要检索连接到用户的所有用户和商店名称。如何使用解析实现这个？

目前我的代码。

PFQuery *query = [PFQuery queryWithClassName:@"users"];

[query findObjectsInBackgroundWithBlock:^(NSArray *objects, NSError *error) {
    if (!error) {


        for (PFObject *object in objects) {

        }

        NSLog(@"%@", objects);



    } else {
        // Log details of the failure
        NSLog(@"Error: %@ %@", error, [error userInfo]);
    }

}];

}

Answer 1

如果我理解正确，您只想获取相关对象？ The documentation covers this

你应该能够获取这样的相关对象：

PFObject *store = user[@"store"]; // reference to related object but may need to be fetched

[store fetchIfNeededInBackgroundWithBlock:^(PFObject *object, NSError *error) {
  // at this point you have fetched the store or you already have it
  NSString *name = store[@"name"];
}];

Answer 2

听起来的目的是获取相关对象，但我对如何做到这一点的理解与@Dima不同。你这样做......

PFQuery *query = [PFQuery queryWithClassName:@"users"];

// this tells the query to eagerly fetch the related store object
[query includeKey:@"store"];

[query findObjectsInBackgroundWithBlock:^(NSArray *objects, NSError *error) {
    // handle error, or ...
    for (PFObject *object in objects) {
        // object is from the users table, and object[@"store"] will contain
        // the complete, related store object, eagerly fetched...
        NSLog(@"the store object for %@ is %@", object, object[@"store"]);
    }
}];

从2个不同的对象中解析检索列

2 个答案: