如何从Firebase检索数据并将其放入字典中?

时间:2019-07-15 01:41:41

标签: swift firebase dictionary dispatch

我有一个组织文档,里面有一个Members集合,然后有一个Member文档。在成员文档内部包括作为成员的用户的地图。密钥是UserID和3个值(firstName,lastName,username)。我正在尝试将此数据加载到我的“ Event”类中,该类包含一个属于dictionarys的membersInvited属性。 Event类内部有一个获取此数据的方法,称为getOrgMembers()。即使我在firebase中有这些数据,我的字典也得到了一个nil值。我也正在使用Dispatch,但是有点新。

下面是事件类中的代码:

var membersInvited: [Member: Bool]?

func getOrgMembers(dispatch: DispatchGroup?) {
    let membRef = BandzDatabase.collection("Organizations").document(currentUser.currentOrgID!).collection("Members").document("members")

    membRef.getDocument { (snapshot, error) in
        if let error = error {
            print (error.localizedDescription)
        } else {
            if let data = snapshot?.data() {
                for (key,value) in data {
                    if let membArray = value as? [String: Any] {
                        let username = membArray["username"] as? String
                        let firstName = membArray["firstName"] as? String
                        let lastName = membArray["lastName"] as? String
                        let userID = key

                        let member = Member(username: username ?? "", firstName: firstName ?? "", lastName: lastName ?? "", userID: userID)

                        self.membersInvited?.updateValue(true, forKey: member)

                    }
                }
            }
        }
        dispatch?.leave()
    }
}

struct Member: Hashable {
    var username: String
    var firstName: String
    var lastName: String
    var userID: String

    init (username: String, firstName: String, lastName: String, userID: String) {

        self.username = username
        self.firstName = firstName
        self.lastName = lastName
        self.userID = userID
    }

}

下面是我从另一个类中调用此方法的地方:

func getMembers() {
    showActivityIndicatory(uiView: self.view)
    self.dispatchGroup.enter()
    eventMade?.getOrgMembers(dispatch: self.dispatchGroup)
    self.dispatchGroup.notify(queue: .main) {
        //self.tableView.reloadData()
        stopActivityIndicator()
        print("happens")
        print(self.eventMade?.membersInvited)
    }
}

1 个答案:

答案 0 :(得分:1)

经过一番研究,我发现由于我从未初始化过字典,所以每当我调用追加键值对时,由于它是可选的,它甚至都不会运行。因此,我将脱节更改为:

var membersInvited: [Member: Bool] = [:]