请问AVOS 中 Relations关系的两张表怎么查询

Question

表A中某一个字段与表B是Relations关系，怎么通过表A查询表B中的字段？

Answer 1

如果是iOS的话可以这么写：

AVQuery *query = [AVQuery queryWithClassName:@"Post"];
[query findObjectsInBackgroundWithBlock:^(NSArray *objects, NSError *error) {
    if (!error) {
        // The find succeeded.
        for (AVObject *object in objects) {
            AVRelation *comments = [object objectForKey:@"comment"];
            [[comments query] findObjectsInBackgroundWithBlock:^(NSArray *objects, NSError *error) {
                for (AVObject *comment in objects) {
                    NSLog(@"%@",comment);
                }
            }];
        }
    } else {
        // Log details of the failure
    }
}];