Question

是否可以在其中一个查询中使用位置进行复合查询。我需要在3英里范围内发布帖子，并且每个人都可以看到一些具有特定布尔值的帖子。

问题是，当我尝试这样做时，它给了我一个解析异常，说“不支持地理查询或”

Answer 1

所以我正在做的事情。我们有一个'Blast'类和一个'Activity'类。爆炸是附近地理定位的物品。活动存储关注者和关注者的关系。我在网上其他地方发现的技巧（我记不住了）是将地理查询包装在另一个查询中，然后一切都很好。在我们的例子中，'nearbyItemsQueryWrapped'有效地'包装''nearbyItemsQuery'，这样我们就可以做一些与你正在做的事情非常相似的事情。

这仍然不是满足我们特定需求的完美解决方案，因为它似乎与“当前”用户的项目存在问题 - 但它非常接近，可能会达到您的目标。

PFGeoPoint *point = [PFGeoPoint geoPointWithLatitude:location.latitude longitude:location.longitude];
    PFQuery *followeesQuery = [PFQuery queryWithClassName:kActivityObjectClassNameKey];
    [followeesQuery whereKey:kActivityFromUserKey equalTo:[PFUser currentUser]];
    [followeesQuery whereKey:kActivityTypeKey equalTo:kActivityTypeFollow];
    [followeesQuery whereKey:kActivityDeletedKey notEqualTo:@YES];

    PFQuery *nearbyItemsQuery = [PFQuery queryWithClassName:kBlastObjectClassNameKey];
    [nearbyItemsQuery whereKey:kBlastLocationKey nearGeoPoint:point withinKilometers:kItemSearchRadius_Largest_Kilometers];
    [nearbyItemsQuery whereKey:kBlastFromUserKey doesNotMatchKey:kActivityToUserKey inQuery:followeesQuery];

    PFQuery *nearbyItemsQueryWrapped = [PFQuery queryWithClassName:kBlastObjectClassNameKey];
    [nearbyItemsQueryWrapped whereKey:kBlastFromUserKey matchesKey:kBlastFromUserKey inQuery:nearbyItemsQuery];

    PFQuery *followersItemQuery = [PFQuery queryWithClassName:kBlastObjectClassNameKey];
    [followersItemQuery whereKey:kBlastFromUserKey matchesKey:kActivityToUserKey inQuery:followeesQuery];

    NSMutableArray *queryArray = NSMutableArray.new;
    [queryArray addObject:followersItemQuery];
    [queryArray addObject:nearbyItemsQueryWrapped];

    PFQuery* compoundQuery = [PFQuery orQueryWithSubqueries:queryArray];
    [compoundQuery includeKey:kBlastFromUserKey];
    [compoundQuery includeKey:kBlastCategoryKey];
    // unexpired only
    [compoundQuery whereKey:kBlastEndDateKey greaterThanOrEqualTo:[NSDate date]];
    // order them chronologically
    [compoundQuery orderByDescending:kBlastStartDateKey];
    // set up paging
    compoundQuery.limit = kQueryLimit;
    compoundQuery.skip = 0;
    // we don't want deleted items
    [compoundQuery whereKey:kBlastDeletedKey equalTo:@NO];        
    [compoundQuery findObjectsInBackgroundWithBlock:^(NSArray *objects, NSError *error) {

使用位置解析复合查询

1 个答案: