iphone - 如何使用 parse.com 访问关系中的数据

Question

我正在使用 Parse.com，我在数据浏览器中有以下表格:User(默认用户表格)和 studyYears。在我的用户表中，我有多个用户。我在用户表中添加了一个关系类型的列，该列引用另一个名为 studyYears 的表。 studyYears 表只包含一个名为 year 的字符串列。

我如何进行查询，以便为用户从 studyYears 表的年份列中获取值？

我希望有人能理解我想要得到的东西。提前致谢!

Answer 1

http://blog.parse.com/2012/05/17/new-many-to-many/状态:

When you fetch the Place object, the objects in the relations won’t be fetched, which is a huge win for a relationship with a large number of objects. Even without fetching all the objects in the relation, you can add objects to the relation using add:. If you wanted to fetch all the objects in the relations, you would do something like:

PFRelation *relation = [place relationForKey:@"likes"];
PFQuery *query = [relation query];
[query findObjectsInBackgroundWithBlock:^(NSArray *results, NSError *error) {
    // results contains all the people who liked Sid's BBQ.
}];