firebase-realtime-database

问题 I have this structure in my firebase database "metadata" : { "2017" : { "Februari" : { "-Kc3BF0V1iLgtnI65LuR" : { "date" : "2017-02-03T13:36:38.311Z", "price" : 90 }, "-Kc3BF0V1xxfrtnI65OlS" : { "date" : "2017-02-03T13:36:38.311Z", "price" : 90 } }, "Januari" : { "-Kc3E5bpxpo3RpSHH3fn" : { "date" : "2017-01-11T13:50:12.264Z", "price" : 45 } } } } What I am trying to achieve in my app is to show a list like this > Januari > - 45 (=price) > > Februari > - 90 () > - 240 The thing is I am able to

问题 I am new firebase developer, a am developing an android app, that using firebase database. This is a part my database. And this is my model class: public class Exam { private String id; private int subject; private String school; private Long examineDate; private int likeCount; private HashMap<String,Object> timeStampSubmit; public Exam(){}; public Exam(String id, int subject, String school, Long examineDate, int likeCount) { this.id = id; this.subject = subject; this.school = school; this

问题 I have the two following tables with services and categories: - servicecat - catid - name : "Category Name" - services - srvid1 : true - srvid2 : true - srvid3 : true - services - srvid - name: "Service Name" - Details: "blabla" - servicecat: - catid1 : true - catid2 : true I'm trying to build a firebaseArray to show when a user click on a service its information and categories. <script> var app = angular.module("sampleApp", ['firebase']); var fb = firebase.database().ref(); app.factory(

问题 I have the two following tables with services and categories: - servicecat - catid - name : "Category Name" - services - srvid1 : true - srvid2 : true - srvid3 : true - services - srvid - name: "Service Name" - Details: "blabla" - servicecat: - catid1 : true - catid2 : true I'm trying to build a firebaseArray to show when a user click on a service its information and categories. <script> var app = angular.module("sampleApp", ['firebase']); var fb = firebase.database().ref(); app.factory(

问题 I have placed some markers on map. As the location of the marker changes it places another marker on the map but keeping the last marker as it is which creates multiple markers of the same id on the map. I there any way to clear the previous marker as the location updates. I am retrieving location changes from firebase database in any array. Here is my code: import android.content.Intent; import android.media.MediaPlayer; import android.net.Uri; import android.os.Bundle; import android.os

问题 I am using Firebase child_added to watch for new entries being added to my database. It seemed to work for a while but then I noticed some issues when leaving the connection idle. If I leave my app open for a prolonged period of time when Firebase returns duplicates. I think it maybe down to the connection being dropped and then established. Here is my code. getVoicemailList: function() { var self = this; var userId = firebase.auth().currentUser.uid; firebase.database().ref('voicemails/' +

问题 Is there an equivalent of startAt(value, [key]) in the REST API? Specifically the optional key param. https://www.firebase.com/docs/web/api/query/startat.html Details: I am paging through a collection on a property (dueDate) using the REST API. Paging through works but, since the values for dueDate are not unique, each successive page may contain several duplicates. In the worst case, there may be more duplicates on a date than the page size, which would break the pagination. Because of the

问题 Hi I wanted to update the firebase data, but when I update it insert to a new data instead of updating the specific data that I set which is the lastname equal to 'hoo' fb.orderByChild("Lastname").equalTo('hoo').once("value", function(snapshot){ console.log(snapshot.ref()); console.log(snapshot.val()); // var snapref = snapshot.ref(); snapshot.ref().update({ FirstName: 'yoyo1' }); }) Edit: fb.orderByChild("Lastname").equalTo('hoo').once("child_added", function(snapshot){ console.log(snapshot

问题 I'm trying to store some certain information in the firebase realtime database. My database structure looks like this: { "contacts" : { "-KdD1f0ecmVXHZ3H3abZ" : { "email" : "ksdsd@sdsd.com", "first_name" : "John", "last_name" : "Smith", "organization_id" : 1 }, "-KdG4iHEYjInv7ljBhgG" : { "email" : "superttest@sds213123d.com", "first_name" : "Max1", "last_name" : "Rosse13131313l", "organization_id" : 1 }, "-KdGAZ8Ws6weXWo0essF" : { "email" : "superttest@sds213123d.com", "first_name" : "Max1",

问题 I'm searching by key in my Firebase database, but it retrieves null and I don't know why. data.getUrl() or data.getText() both give me null values. In debugging, before line test data = dataSnapshot.getValue(test.class); it shows me that data should've retrieved what I'm looking for, but when that line executes, it gives me null. Database structure: { "images" : { "partner " : { "text" : "partner", "url" : "http://res.cloudinary.com/dg3jylcsw/image/upload/v1483565650/sister_x3lv6j.png" },