Question

我运行此代码以使用Parse.com的PFQuery：

获取结果

+ (void)fetchFresh:(BOOL)refresh threadsForUser:(PFUser *)user orItem:(PFObject *)item withCompletion:(void(^)(NSArray *array))completion {

    PFQuery *queryFrom = [PFQuery queryWithClassName:THREAD];
    [queryFrom whereKey:THREAD_FROM equalTo:[PFUser currentUser]];

    PFQuery *queryTo = [PFQuery queryWithClassName:THREAD];
    [queryTo whereKey:THREAD_TO equalTo:[PFUser currentUser]];

    if (user) {
        [queryFrom whereKey:THREAD_TO equalTo:user];
        [queryTo whereKey:THREAD_FROM equalTo:user];
    }

    PFQuery *query = [PFQuery orQueryWithSubqueries:@[queryFrom, queryTo]];
    [query includeKey:THREAD_FROM];
    [query includeKey:THREAD_TO];
    [query includeKey:THREAD_ITEM];
    [query includeKey:@"item.owner"];
    [query includeKey:@"item.purpose"];
    [query includeKey:@"item.category"];
    [query includeKey:@"item.shareContacts"];
    [query includeKey:@"item.shareGroups"];
    [query includeKey:THREAD_MESSAGES];
    [query includeKey:THREAD_SWAP_ITEMS];
    [query includeKey:@"swapItems.owner"];
    [query includeKey:@"swapItems.purpose"];
    [query includeKey:@"swapItems.category"];
    [query includeKey:@"swapItems.shareContacts"];
    [query includeKey:@"swapItems.shareGroups"];

    if (item) {
        [query whereKey:THREAD_ITEM equalTo:item];
    }

    NSLog(@"%@ %@", refresh ? @"REFRESH" : @"NO REFRESH", query.hasCachedResult ? @"CACHE" : @"NO CACHE");
    [query setCachePolicy:(refresh || !query.hasCachedResult) ? kPFCachePolicyCacheThenNetwork: kPFCachePolicyCacheElseNetwork];
    query.limit = 1000;

    [query findObjectsInBackgroundWithBlock...];
}

这里的想法是，如果存在缓存结果，它应该转为缓存，但是在没有缓存结果时第一次获取它们。

如果NSLog已缓存结果，我尝试query时，结果始终为NO。

值得一提的是，我每次都运行这个确切的代码，即每次都创建一个新的PFQuery对象。我的理解是结果是根据PFQuery属性的集合进行缓存的，而不是它是同一个对象，所以我希望缓存结果。

ALSO ，该方法是我用来处理数据请求的实用程序类中的类方法。这可能是一个问题吗？

PFQuery从未缓存过结果

0 个答案: