Ios 从parse.com获取不同的值

我有一个parse.com后端和一些表：

shop
product
shopHasProduct
  Shop:Shop Pointer;
  Product:Product pointer; 
  + some fields relation to shop-specific info

所以shopHasProduct是一个多对多表

我需要的是获得shopHasProduct表中没有的特定商店的所有产品

到目前为止，我所做的是在shopHasProduct表上查询：

这让我得到了所有不在当前商店的产品。但是每个商店都有这些产品，所以它们会再次出现

如何对它们进行排序以使它们不同？

我最终没有使用PFQueryTableViewController，而是使用普通的UITableViewController

在viewDidLoad中，我执行以下操作：

PFQuery *shopHasProductThisShop = [[PFQuery alloc] initWithClassName:@"shopHasProduct"];
[shopHasProductThisShop whereKey:@"Shop" equalTo:[[PFUser currentUser] objectForKey:@"currentShop"]];



PFQuery *hej = [[PFQuery alloc] initWithClassName:@"shopHasProduct"];
[hej whereKey:@"Product" doesNotMatchKey:@"Product" inQuery:shopHasProductThisShop];
[hej includeKey:@"Product"];

[hej findObjectsInBackgroundWithBlock:^(NSArray *allProducts, NSError *error) {

    self.productToAdd = [NSMutableArray new];
    self.productArray = [NSMutableArray new];
    NSLog(@"Hvor mange er der i alle prodikter'et:%d", [allProducts count]);

    for (PFObject *object in allProducts) {

        PFObject *random = object[@"Product"];
        [self.productArray addObject:random];

    }
    NSSet *uniqueStates = [NSSet setWithArray:[self.productArray valueForKey:@"objectId"]];

    NSArray *foobar = [uniqueStates allObjects];
    for (NSString *string in foobar) {
        PFObject *hulo = [PFQuery getObjectOfClass:@"Product" objectId:string];
        [self.productToAdd addObject:hulo];
    }  
   [self.tableView reloadData];
}];

所以我得到了一个只有不同产品的NSMutableArray

PFQuery *shopHasProductThisShop = [[PFQuery alloc] initWithClassName:@"shopHasProduct"];
[shopHasProductThisShop whereKey:@"Shop" equalTo:[[PFUser currentUser] objectForKey:@"currentShop"]];



PFQuery *hej = [[PFQuery alloc] initWithClassName:@"shopHasProduct"];
[hej whereKey:@"Product" doesNotMatchKey:@"Product" inQuery:shopHasProductThisShop];
[hej includeKey:@"Product"];

[hej findObjectsInBackgroundWithBlock:^(NSArray *allProducts, NSError *error) {

    self.productToAdd = [NSMutableArray new];
    self.productArray = [NSMutableArray new];
    NSLog(@"Hvor mange er der i alle prodikter'et:%d", [allProducts count]);

    for (PFObject *object in allProducts) {

        PFObject *random = object[@"Product"];
        [self.productArray addObject:random];

    }
    NSSet *uniqueStates = [NSSet setWithArray:[self.productArray valueForKey:@"objectId"]];

    NSArray *foobar = [uniqueStates allObjects];
    for (NSString *string in foobar) {
        PFObject *hulo = [PFQuery getObjectOfClass:@"Product" objectId:string];
        [self.productToAdd addObject:hulo];
    }  
   [self.tableView reloadData];
}];