Find a object by another object

Hi, I have a class :
class BidHistory : NSObject {

var objectId: String?
var userObjectID: String?
var bidParticipatedIn: BidItem?
var bidStatusDescription: NSNumber? = 111
}
I want to search in the dataBase a BidHistory object by the bidParticipatedIn object… I get an error like :
FAULT = ‘Server.Processing’ [java.lang.RuntimeException: java.lang.StringIndexOutOfBoundsException: String index out of range: -1] <java.lang.RuntimeException: java.lang.StringIndexOutOfBoundsException: String index out of range: -1>

I attached a screenshot with my request.
Thank you!

I want to do it optimally…for now what I do is this :

static func getBidHistoryByBidItem(userObjectId: String, bidItem: BidItem?, completionHandler: BidHistory? -> Void ) {

    let dataQuery = BackendlessDataQuery()

    dataQuery.whereClause = "userObjectID = '\(userObjectId)'"

    

    Backendless.sharedInstance().data.of(BidHistory.ofClass()).find(dataQuery, response: { (collectionObjects) in

        

        if let data = collectionObjects.data {

            let bidHistoryObjects = data as! [BidHistory]

            for i in 0..<bidHistoryObjects.count {

                let aBidHistory = bidHistoryObjects as BidHistory

                if aBidHistory.bidParticipatedIn?.objectId == bidItem?.objectId {

                    completionHandler(aBidHistory)

                    return

                }

            }

            completionHandler(nil)

        }

        

        }) { (fault) in

            print("There was an error on retrieving the bid history for the current user: \(fault)")

    }

}

Isabela, you could do it more optimally with

dataQuery.whereClause = "userObjectID = '\(userObjectId)' AND bidParticipatedIn.objectId = '\(bidItem!.objectId)'"

Please investigate this and this docs.

And please remove (or rename) ‘description’ field in Users table: it throws an exception.

Ok, I removed it. Thank you!