firebase-realtime-database

问题 Say I have data like so: users{ $authId: { name:"", propertiesById:{ uniqueId1:true, uniqueId2:true } } }, properties:{ uniqueId1:{ key:val }, uniqueId2:{ key:val } } Assuming that I have the proper rules in place for users to be able to only read/write their own user object, how do I go about reading my properties safely? I know that in rules, I can go to root, find the user object and ensure that the property that I'm trying to read exists in the propertiesById, but that seems like it would

问题 I need to store the date that something was created in the firebase database for a friend request, how can i store a date in firebase that i can work out how long ago since this date something happened. I would just store an NSDate in there but then what about timezones? I dunno if firebase has something like Parse had where it would store date created and timezone automatically so you could read it from the server? 回答1: You need to set it up by yourself ! I use this code to do the timestamp.

问题 I created a listview with two textviews, i want to get the date and time specific to any data added to the database into the textview from firebase. Is there any method to achieve the aforementioned? Thanks. 回答1: You need to add another child to store the timestamp when saving the data. Your data structure should look something like this "data": { "id1": { "text": "some text", "timestamp": 1472861629000 }, "id2": { "text": "some text", "timestamp": 1472861629000 }, "..." } To save the

问题 I could achieve some filtering behaviour with my question querying subset from angularfire2. Now I want to display these values as a list in Angular using ngFor. In my ts file I have: export class OtherAnimals{ public animalList: Observable<{}>; constructor(public af: AngularFire) { this.animalList = Observable.combineLatest( this.af.database.object('/set1/'), this.af.database.object('/set2/'), // Use the operator's project function to emit an // object containing the required values. (set1,

问题 I enrolled a course on Udemy a while back, on how to create a chat application with Swift and Firebase, simply because I wanted to get an insight of how it all was working. However, I finished the course a week later. This was a couple of months ago, and since then - there has been an update to both Firebase and Swift, and I am currently struggling with converting some of the old code, to new code. Here is the code that I am currently struggling with: func loadRecents() { firebase.child(

问题 Doing CRUD in firebase is pretty easy and neat IMO. But I am confuse on how to protect the whole database. So I have this database rules : { "rules": { ".read": "auth != null", ".write": "auth != null", } } Let's say I have a bunch of data on my database. If the user is not yet authenticated this code firebase.database().ref('/').set(null) is replying a permission_denied error which is normal. But the problem is once a certain user logs in and gets authenticated, this code firebase.database()

问题 I want to add key and value to all childs in Firebase("rate":0). This is my JSON tree. How I am able to loop trough the JSON tree and set "rate":0 to all of them like this: I tried doing it with Pyrebase but it was a pain. 回答1: Try:- FIRDatabase.database().reference().child("Snuses").observeSingleEvent(of: .value, with: {(toBeAppendedSnap) in if let snapDict = toBeAppendedSnap.value as? [String:AnyObject]{ for each in snapDict{ let eachKey = each.key if let eachValue = each.value as?

问题 I have a getUser method within an Authentication provider (working in Ionic 2): getUser(uid: string): any { var toReturn; firebase.database().ref('/userProfile').orderByKey().equalTo(uid).once("value", function(snapshot){ toReturn = snapshot.val(); console.log("getUser = " + JSON.stringify(toReturn)); }); return toReturn; } It retrieves a user object from firebase. It gets output correctly with the console.log providing it exists and is saved in the toReturn variable. Below is the

问题 Wonder why can't start the mAuth.signInWithEmailAndPassword() inside my onClick() button as I've done before. Should i call it another way? but how, It's not much of information out there yet about the new version. Currently it gives be the error String is empty or null: Process: com.example.rasmusjosefsson.rjcar, PID: 30563 java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.rasmusjosefsson.rjcar/com.example.rasmusjosefsson.rjcar.LoginAndSignUp.LoginActivity}: java

问题 I have the below Json schema , what firebase query can I use to get the node name(0153,0154) , I am able to get the name(joel,vikram,sachin) using once method "EmployeeInfo": { "0153": { "Name":"Joel", "Dept":"Engineering", "Email":"joel@dept.com" }, "0163": { "Name":"Vikram", "Dept":"Engineering", "Email":"vikram@dept.com" }, "0173": { "Name":"Sachin", "Dept":"Engineering", "Email":"Sachin@dept.com" } Here is my javascript function : function Call() { var dbref = new Firebase("https:/