[英]Get distinct values from parse.com
I've got a parse.com back-end with some tables: 我有一个带有一些表的parse.com后端:
shop
product
shopHasProduct
Shop:Shop Pointer;
Product:Product pointer;
+ some fields relation to shop-specific info
So shopHasProduct
is a many-to-many table. 因此
shopHasProduct
是一个多对多表。
What I need, is to get all the product
that is not in shopHasProduct
table for a specific shop
. 我需要的是获取特定
shop
shopHasProduct
表中没有的所有product
。
What i've done so far is (query is on shopHasProduct
table): 到目前为止,我所做的是(查询在
shopHasProduct
表上):
[query whereKey:@"Shop" notEqualTo:[[PFUser currentUser] objectForKey:@"currentShop"]];
[query includeKey:@"Product"];
PFQuery *shopHasProductThisShop = [[PFQuery alloc] initWithClassName:@"shopHasProduct"];
[shopHasProductThisShop whereKey:@"Shop" equalTo:[[PFUser currentUser] objectForKey:@"currentShop"]];
PFQuery *finalQ = [[PFQuery alloc] initWithClassName:@"shopHasProduct"];
[finalQ whereKey:@"Product" doesNotMatchKey:@"Product" inQuery:shopHasProductThisShop];
[finalQ includeKey:@"Product"];
return finalQ;//query;
That gets me all the products, that are not in the current shop. 那让我得到了当前商店中没有的所有产品。 But the products are there for each shop, so they are reoccurring.
但是每家商店都有产品,因此它们不断发生。
How do I sort them so they are distinct? 我该如何对它们进行分类以使其与众不同?
I ended up not using PFQueryTableViewController
but a normal UITableViewController
我最终没有使用
PFQueryTableViewController
而是一个普通的UITableViewController
in viewDidLoad I do the following: 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];
}];
So I get an NSMutableArray with only distinct products. 因此,我得到的NSMutableArray仅包含独特的产品。
声明:本站的技术帖子网页,遵循CC BY-SA 4.0协议,如果您需要转载,请注明本站网址或者原文地址。任何问题请咨询:yoyou2525@163.com.