使用Cloud Code刪除PFUser Parse.com iOS

Question

我成功添加好友Cloud代碼和Parse.com。

現在我想用雲代碼以刪除didSelectRowAtIndexPath方法的朋友關係

我的錯誤是「attempt to insert nil object from objects[0]'」

但我不知道我需要配置什麼參數，我發現爲雲代碼main.js：

Parse.Cloud.define("removeFriend", function(request, response) 
{ 
    // here's how to get the client's user making the request 
    var user = request.user; 

    // consider checking that user && request.params.friend are valid 
    // if not, return response.error("missing user or friend id") 

    getUser(request.params.friend).then(function(friend) { 
     // your code prematurely called response.success() here, thereby canceling any further steps 
     friend.relation("friendsRelation").remove(user); 
     // return the promise returned by save() so we can chain the promises 
     return friend.save(); 
    }).then(function(result) { 
     // only now that the save is finished, we can claim victory 
     response.success(result); 
    }, function (error) { 
     response.error(result); 
    }); 
}); 

// EDIT - the OP once referred to a getUser function that we assume to be something like this: 
// return a promise to get a user with userId 
function getUser(userId) { 
    var userQuery = new Parse.Query(Parse.User); 
    return userQuery.get(userId); 
} 

這裏是我的代碼艾迪tFriends.m：

- (void)viewDidLoad 
    { 
     [super viewDidLoad]; 
     PFQuery *query = [PFUser query]; 
     [query orderByAscending:@"name"]; 
     [query findObjectsInBackgroundWithBlock:^(NSArray *objects, NSError *error) { 
      if (error) { 
       NSLog(@"Error: %@ %@", error, [error userInfo]); 
      } 
      else { 
       self.allUsers = objects; 
       [self.tableView performSelectorOnMainThread:@selector(reloadData) withObject:nil waitUntilDone:NO]; 
      } 
     }]; 

     self.currentUser = [PFUser currentUser]; 
     [self loadFriends]; 
    } 

-(void) loadFriends{ 
    self.friendsRelation = [[PFUser currentUser] objectForKey:@"friends"]; 
    PFQuery *query = [self.friendsRelation query]; 
    [query orderByAscending:@"username"]; 
    [query findObjectsInBackgroundWithBlock:^(NSArray *objects, NSError *error) 
    { 
     if (error) { 
      NSLog(@"Error %@ %@", error, [error userInfo]); 
     } 
     else { 
      self.friends = objects; 

      [self.tableView reloadData]; 
     } 
    }]; 
} 


    - (BOOL)isFriend:(PFUser *)user { 
     for(PFUser *friend in self.friends) { 
      if ([friend.objectId isEqualToString:user.objectId]) { 
       return YES; 
      } 
     } 

     return NO; 
    } 

的cellForRowAtIndexPath：

- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath 
{ 
    static NSString *CellIdentifier = @"Cell"; 
    UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier forIndexPath:indexPath]; 

    PFUser *user = [self.allUsers objectAtIndex:indexPath.row]; 

    NSString *name = [[self.allUsers objectAtIndex:indexPath.row] valueForKey:@"username"]; 
    cell.textLabel.text = name; 

    if ([self isFriend:user]) { 
     cell.accessoryType = UITableViewCellAccessoryCheckmark; 

    } else { 

     cell.accessoryType = UITableViewCellAccessoryNone; 
    } 

    return cell; 
} 

didSelectRowAtIndexPath方法：

PFUser *selected = [self.allUsers objectAtIndex:indexPath.row]; 
    if ([self isFriend:selected]) { 
     NSLog(@"déjà amis"); 
//  PFObject *friendRequest = [self.friendRequests objectAtIndex:indexPath.row]; 
     [PFCloud callFunctionInBackground:@"removeFriend" withParameters:@{@"friendRequest" : selected.objectId} block:^(id object, NSError *error) { 

      if (!error) { 
       //add the fromuser to the currentUsers friends 

       //save the current user 
       [self.currentUser saveInBackgroundWithBlock:^(BOOL succeeded, NSError *error) { 

        if (succeeded) { 



        } else { 

        } 

       }]; 

      } 
      else { 

      } 


     }]; 

    } 
else{ 
    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:@"Yay" message:@"Friend request sent" delegate:nil cancelButtonTitle:@"OK" otherButtonTitles:nil, nil]; 
      [alert show]; 



     } else { 

      // error occurred 
     } 
    }]; 
} 

Answer 1

iOS的代碼看起來不錯，只需要確保它發送正確用戶objectId。

雲代碼是接近的，但必須提高一點點：

Parse.Cloud.define("removeFriend", function(request, response) 
{ 
    // here's how to get the client's user making the request 
    var user = request.user; 

    // consider checking that user && request.params.friend are valid 
    // if not, return response.error("missing user or friend id") 

    getUser(request.params.friendRequest).then(function(friend) { 
     // your code prematurely called response.success() here, thereby canceling any further steps 
     console.log("relation is:" + JSON.stringify(friend.relation("friends"))); 
     friend.relation("friends").remove(user); 
     // return the promise returned by save() so we can chain the promises 
     return friend.save(); 
    }).then(function(friend) { 
     // friendship goes both ways, so remove the friend from user's friends 
     user.relation("friends").remove(friend); 
     return user.save(); 
    }).then(function(result) { 
     // only now that the save is finished, we can claim victory 
     console.log("relation is:" + JSON.stringify(result.relation("friends"))); 
     response.success(result); 
    }, function (error) { 
     response.error(error); 
    }); 
}); 

// EDIT - the OP once referred to a getUser function that we assume to be something like this: 
// return a promise to get a user with userId 
function getUser(userId) { 
    var userQuery = new Parse.Query(Parse.User); 
    return userQuery.get(userId); 
} 

編輯 - 來電：

PFUser *selected = [self.allUsers objectAtIndex:indexPath.row]; 
if ([self isFriend:selected]) { 
    NSLog(@"déjà amis"); 
    [PFCloud callFunctionInBackground:@"removeFriend" withParameters:@{@"friendRequest" : selected.objectId} block:^(id object, NSError *error) { 
    // etc.