Swift：Parse 中的长查询（OR/AND 条件）

Question

我需要使用 Parse SDK 执行 compound query。

我的代码：

func retrieveObjects() {
  let conditions: [String] = .....
  let query: PFQuery = self.generateCompoundQueryFromConditions(conditions)
  query.findObjectsInBackgroundWithBlock { (objs:[AnyObject]?,error: NSError?) -> Void in
      NSLog("\(objs)")
  }
}

private func generateCompoundQueryFromConditions(conditions: [String]) -> PFQuery {
    var queries: [PFQuery] = []
    for condition: String in conditions {
        var query = PFQuery(className:"MyClassName")
        query.whereKey("objectId", equalTo: condition)
        queries.append(query)
    }
    return PFQuery.orQueryWithSubqueries(queries)
}

Conditions.count -> 24
代码运行良好，但出现此错误：

 [Error]: too many $or clauses (Code: 154, Version: 1.7.4)

有没有办法用许多 OR 条件进行查询？

更新

我也尝试使用 NSPredicate：

private func generateQueryWithPredicateFromConditions(conditions: [String]) -> PFQuery {
    var predicates: [NSPredicate] = []
    for condition in conditions {
        predicates.append(NSPredicate(format: "objectId = %@", condition))
    }
    let predicate = NSCompoundPredicate.orPredicateWithSubpredicates(predicates)
    return PFQuery(className: "MyClassName", predicate: predicate)
}

现在的错误是：

'This query is too complex. It had an OR with >4 subpredicates after normalization.'

因此，在 N-OR 条件下，我将执行 N / 4 + N % 4 PFQuery，然后合并结果。有没有办法解决？

Answer 1

我自己是这样解决的，希望对大家有帮助：

let query = PFQuery(className: "MyClassName")
query.whereKey("objectId", containedIn: conditions)
query.findObjectsInBackgroundWithBlock { (objs:[AnyObject]?,error: NSError?) -> Void in
    NSLog("\(objs)")
}