查询Firestore数据库的日期范围

Question

import UIKit
import Firebase

class DiscoverRideViewController: UIViewController {

    var userFullName = String()
    var dateEarly = Constants.UserInfo.chosenDate.addingTimeInterval(-900)
    var offset = TimeInterval()

    @IBOutlet weak var createRide: UIButton!

    override func viewDidLoad() {
        super.viewDidLoad()
        print(dateEarly)
        offset = TimeInterval(TimeZone.current.secondsFromGMT())
        print("timezone offset: ", offset)
        dateEarly = dateEarly.addingTimeInterval(offset)

        print("searching for documents:")
        let db = Firestore.firestore()
        db.collection("rides-wfu").whereField("aiport", isEqualTo: Constants.UserInfo.chosenAirport).whereField("ridetime", isGreaterThanOrEqualTo: dateEarly).getDocuments() { (querySnapshot, err) in
            if let err = err {
                print("Error getting documents: \(err)")
            } else {
                for document in querySnapshot!.documents {
                    print("\(document.documentID) => \(document.data())")
                }
            }
        }
    }

    @IBAction func newRideTapped(_ sender: Any) {
        let db = Firestore.firestore()
        print(Constants.UserInfo.chosenDate)
        db.collection("rides-wfu").addDocument(data: ["airport":Constants.UserInfo.chosenAirport, "ridetime":Constants.UserInfo.chosenDate, "groupmembers":[Constants.UserInfo.firstName+" "+Constants.UserInfo.lastName, "", "", ""]])
    }
}

这是当我尝试使用'where'而不是'where field'时收到的错误，尽管从文档中看，'where'似乎是查询Firestore数据库的有效命令。是不是我需要下载其他的豆荚？我有的是:pod'firebase/analytics'pod'firebase/auth'pod'firebase/core'pod'firebase/firestore'

Answer 1

您现在有以下查询：

db.collection("rides-wfu").where("ridetime", ">", timestampEarly)

这不是SWIFT的有效查询语法。你要找的是：

db.collection("rides-wfu").whereField("ridetime", isGreaterThanOrEqualTo: timestampEarly)

我强烈建议研究关于查询Firestore的Firebase文档，因为它包含了这方面的示例和更多类型的查询。