如何使用解析添加两个 PFquery 数据的对象？答案

【问题标题】：How to add objects of two PFquery data using parse?如何使用解析添加两个 PFquery 数据的对象？
【发布时间】：2013-07-06 05:48:15
【问题描述】：

我有两个查询，一个是friendsrequestQuery，另一个是用户查询我想在从用户查询中获取数据时将friendrequestQuery详细信息的所有数据添加到用户查询中。

NSPredicate *predicate12=[NSPredicate predicateWithFormat:@"((UserFriendId == %@ )AND (UserId!=%@)) OR ((UserFriendId != %@ )AND (UserId==%@)) ",@"Nwk44aeSrz",@"Nwk44aeSrz",@"Nwk44aeSrz",@"Nwk44aeSrz"];
PFQuery *innerQuery = [PFQuery queryWithClassName:@"FriendsDetails" predicate:predicate12];
[innerQuery whereKey:@"BlockStatus" equalTo:@"No"];
PFQuery * userQuery = [PFUser query];

[userQuery whereKey:@"objectId" matchesKey:@"UserFriendId" inQuery:innerQuery];
[userQuery whereKey:@"objectId" matchesKey:@"UserId" inQuery:innerQuery];

[userQuery whereKey:@"objectId" notEqualTo:@"Nwk44aeSrz"];

我将解释我真正需要的是，在内部查询表中，我有 10 列，但我需要这些特定的 coloum 数据 converstionid、lastmessage、lastdate 的数据，同时重新获取用户查询的数据。现在我得到了 userquery 的详细信息，而不是 innerquery 的详细信息，所以我需要 Innerquerydetails 的详细信息。请帮帮我。

【问题讨论】：

标签： ios parse-platform pfquery

【解决方案1】：

我认为您最好存储指针而不是 Id，这样您也可以包含该数据。

我不会使用谓词，我意识到您的查询使用谓词更清晰，但我认为这样更容易理解逻辑。您可以自己将其转换回谓词。

// get your user
PFUser * userForQuery; // set up your user for the query, if it's current user, = [PFUser currentUser];

// first part of predicate
PFQuery * innerQueryA = [PFQuery queryWithClassName:@"FriendsDetails"];
[innerQueryA whereKey:@"UserFriend" equalTo:userForQuery]; // from  @"UserFriendId"
[innerQueryA whereKey:@"User" notEqualTo:userForQuery]; // from @"UserId"

// second part of predicate
PFQuery * innerQueryB = [PFQuery queryWithClassName:@"FriendsDetails"];
[innerQueryB whereKey:@"userFriend" notEqualTo:userForQuery]; // from @"UserFriendId"
[innerQueryB whereKey:@"user" equalTo:userForQuery]; // from @"UserId"

// combine
PFQuery * query = [PFQuery orQueryWithSubqueries:@[innerQueryA, innerQueryB]];
[query whereKey:@"BlockStatus" equalTo:@"No"];

// Now, as you remember, we are storing a pointer in @"User" as opposed to an id @"UserId" as you had it. Because of     
// this, we will use parse's includeKey: feature.

[query includeKey:@"User"]; // tells the query to include the data associated with these keys;

NSMutableArray * usersRetrieved = [[NSMutableArray alloc]init];
[query findObjectsInBackgroundWithBlock:^(NSArray *objects, NSError *error) {
    if (!error) {    
        // objects will contain all of your objects
        for (PFObject * object in objects) {
            [usersRetrieved addObject:object[@"User"]]; // all the data should be available for the @"User" object
        }

        // objects will contain all the @"friendDetails" objects
        // usersRetrieved will contain all the @"User" objects
    }
    else {
    }
}];

我意识到这会稍微改变您的数据结构，但它应该为您提供所需的所有数据。

【讨论】：