[英]How to read/write from one IOS App set up with firebase, to another firebase database contained in another firebase project? Swift 3
I have a Firebase database connected to my IOS app with the GoogleService-Info.plist. 我有一个Firebase数据库,它通过GoogleService-Info.plist连接到我的IOS应用程序。 In AppDelegate I configured the App FIRApp.configure(). 在AppDelegate中,我配置了App FIRApp.configure()。 I could read/write data. 我可以读/写数据。
Now, from within this IOS app, I would like to access another FireBase Database brevCustomer
. 现在,从这个IOS应用程序中,我想访问另一个FireBase数据库brevCustomer
。 For some reason let dbRef
from viewDidLoad
has a flag in Xcode saying this 'immutable value dbRef
was never used' and the app crashes on the first line in fun startObserving() dbRef.observe(.value, with: { (snapshot: FIRDataSnapshot) in
. 出于某种原因, let dbRef
viewDidLoad
中的let dbRef
在Xcode中带有一个标志,表明此“从未使用过不可变的值dbRef
”,并且应用程序在startObserving() dbRef.observe(.value, with: { (snapshot: FIRDataSnapshot) in
)的第一行崩溃dbRef.observe(.value, with: { (snapshot: FIRDataSnapshot) in
。
Could anyone show how to do the configuration so that I can read/write to brevCustomer database? 谁能显示如何进行配置,以便可以读写brevCustomer数据库?
EDIT 编辑
Please consider the following scenario: 请考虑以下情形:
I have two IOS apps Customer and Worker and two Firebase Projects named CustomerFireBase and WorkerFirebase and I would like them to work in the following way. 我有两个IOS应用程序Customer和Worker,以及两个名为CustomerFireBase和WorkerFirebase的 Firebase项目,我希望它们以以下方式工作。
Customer registers with email and password, logs in, makes a booking, and data is saved in CustomerFireBase. 客户使用电子邮件和密码注册,登录,进行预订,然后将数据保存在CustomerFireBase中。
How can I achieve this? 我该如何实现? Basically, I need to get read/write access from one IOS app configured in the usual way with Firebase, to another Firebase Database contained in another Firebase project. 基本上,我需要从使用Firebase 按常规方式配置的一个IOS应用程序获得对另一个Firebase项目中包含的另一个Firebase数据库的读写访问权限。
Class Claim {
var dbRef:FIRDatabaseReference! //create a reference to Firebase database `brevCustomer`, not the one from .plist file
override func viewDidLoad() {
super.viewDidLoad()
let app = FIRApp(named: "brevCustomer")
let dbRef = FIRDatabase.database(app: app!).reference().child("Users")
startObservingDB() // observe the database for value changes
}
func startObservingDB() {
//it crashes on the line below
dbRef.observe(.value, with: { (snapshot: FIRDataSnapshot) in
//iterate over each user node child
for user_child in snapshot.children {
print(user_child)}
}, withCancel: { (Error: Any) in
print(Error)
})
} // end of startObservingDB()
}//end of Claim class
class AppDelegate: UIResponder, UIApplicationDelegate {
var window: UIWindow?
func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplicationLaunchOptionsKey: Any]?) -> Bool {
// Use Firebase library to configure APIs for the initial project with .plist file saved in Xcode
FIRApp.configure()
/** 1. create a Firebase options object to hold the configuration data for the second Firebase Project */
let secondaryOptions = FIROptions(googleAppID: "1:82424687545:ios:71df5d45218ad27",
bundleID: "com.vivvdaplar.Brev",
gcmSenderID: "8201647545",
apiKey: "AIzaSyCNtyUf2T3UunH6-ci_WyvOqCl_RzXI",
clientID: "8200687545-42vklp94reavi6li6bolhcraoofc6.apps.googleusercontent.com",
trackingID: nil,
androidClientID: nil,
databaseURL: "https://brev-72e10.firebaseio.com",
storageBucket: "com.vivvdaplar.Brev",
deepLinkURLScheme: nil)
// Configure the app
FIRApp.configure(withName: "brevCustomer", options: secondaryOptions!)
return true
}
} //end of AppDelegate
Responding the question and comments. 回答问题和评论。
As you know, when a user registers with Firebase, a user account is created on the Firebase server and the user is provided a user id (uid). 如您所知,当用户向Firebase注册时,会在Firebase服务器上创建一个用户帐户,并为该用户提供用户ID(uid)。
A typical design pattern is to have a /users node in Firebase that stores other information about the user, such as a nickname, address or phone number. 一种典型的设计模式是在Firebase中拥有一个/ users节点,该节点存储有关用户的其他信息,例如昵称,地址或电话号码。
We can leverage that /users node to also indicate what kind of user it is; 我们可以利用那个/ users节点来指出它是什么样的用户。 Worker or Client, which would tie into the rest of the app and Firebase so they get to the correct data. Worker或Client,将它们与应用程序和Firebase的其余部分绑定在一起,以便它们获取正确的数据。
For example 例如
users
uid_0
nickname: "John"
user_type: "Worker"
uid_1
nickname: "Paul"
user_type: "Client"
uid_2
nickname: "George"
user_type: "Worker"
uid_3
nickname: "Ringo"
user_type: "Worker"
As you can see, John, George and Ringo are all workers and Paul is a client. 如您所见,John,George和Ringo都是工人,Paul是客户。
When the user logs in, the Firebase signIn function will return the users auth data, which contains the uid. 当用户登录时,Firebase登录功能将返回用户的身份验证数据,其中包含uid。
Auth.auth().signIn(withEmail: "paul@harddaysnight.com", password: "dog",
completion: { (auth, error) in
if error != nil {
let err = error?.localizedDescription
print(err!)
} else {
print(auth!.uid)
//with the uid, we now lookup their user type from the
//users node, which tells the app if they are a client
//or worker
}
})
If the app data is divided like this 如果应用数据是这样划分的
app
client_data
...
worker_data
...
A simple rule could be set up that verifies the users user_type is Worker for the worker_data node and Client for the client_data node. 可以设置一个简单的规则,以验证用户user_type对于worker_data节点是Worker,对于Client_data节点是Client。 Here's a pseudo example that will allow a Client user to only access the data in the client_data node (conceptual) 这是一个伪示例,该示例将允许Client用户仅访问client_data节点中的数据(概念性)
rules
client_data
$user_id
".read": "auth != null && root.child(users)
.child($user_id)
.child("user_type") == 'Client'"
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