Parse.com 检查friendRequest 重复iOS

Question

我想避免与 Parse.com 和 Cloud Code 或 iOS Code 发生重复。 这是我的数据库中的课程：

我希望当“from”userId已经发送到“to”userId时，不会发送第二个friendRequest。

这是我的 iOS 代码：

PFUser *selectedUser = [self.allUsers objectAtIndex:indexPath.row];
//request them
PFObject *friendRequest = [PFObject objectWithClassName:@"FriendRequest"];
friendRequest[@"from"] = self.currentUser;
friendRequest[@"fromUsername"] = [[PFUser currentUser] objectForKey:@"username"];
//selected user is the user at the cell that was selected
friendRequest[@"to"] = selectedUser;
// set the initial status to pending
friendRequest[@"status"] = @"pending";
[friendRequest saveInBackgroundWithBlock:^(BOOL succeeded, NSError *error) {

    if (succeeded) {


        UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"Sent !" message:@"Friend request sent" delegate:nil cancelButtonTitle:@"OK" otherButtonTitles:nil, nil];
        [alert show];



    } else {

        // error occurred
    }
}];

Answer 1

嗨，如果您已经发送了好友请求或从“当前用户”到“选定用户”，您可以按照以下方式获取：

-(void)fetchfriendrequestAndSave{

    PFUser *selectedUser = [self.allUsers objectAtIndex:indexPath.row];
    //request them
    PFObject *friendRequest = [PFObject objectWithClassName:@"FriendRequest"];
    friendRequest[@"from"] = self.currentUser;
    friendRequest[@"fromUsername"] = [[PFUser currentUser] objectForKey:@"username"];
    //selected user is the user at the cell that was selected
    friendRequest[@"to"] = selectedUser;
    // set the initial status to pending
    friendRequest[@"status"] = @"pending";

    PFQuery*query = [PFQuery queryWithClassName:@"FriendRequest"];
    [query whereKey:@"from" equalTo:self.currentuser];
    [query whereKey:@"to" equalTo: selectedUser];
    [query findObjectsInBackgroundWithBlock:^(NSArray*FriendRequestArray, NSError*error){

        if(!error){

            NSArray*temp = [NSArray arrayWithArray:object];
            if(temp.count==0){

                //Save & Send Request

                [friendRequest saveInBackgroundWithBlock:^(BOOL succeeded, NSError *error) {


                    if (succeeded) {


                        UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"Sent !" message:@"Friend request sent" delegate:nil cancelButtonTitle:@"OK" otherButtonTitles:nil, nil];
                        [alert show];



                    } else {

                        // error occurred
                    }
                }];


            }else{

                UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"FriendREquest ERROR" message:@"Friend Request is Already Submitted" delegate:nil cancelButtonTitle:@"OK" otherButtonTitles:nil, nil];
                [alert show];


            }


        }else{

        }

    }];
}

通过 PFQuery：

您搜索“CurrentUser”和“SelectedUser”的值是否在 Parse.com Serve 的同一行中可用！如果是，它将返回一个数组“temp”...如果不是，它也会返回一个数组...但是如果它是 0，我们将计算这个数组（所以这意味着其中没有值，简单来说...... .无好友请求”

if (NSArray*temp.count == 0) 保存请求！

希望这对您有帮助！对我来说它有效