firebase

问题 I have a very simple Firebase Database which looks like this: This is my model: public class ShoppingListModel { private String shoppingListName; private Map<String, String> usersMap; public ShoppingListModel() {} public void setShoppingListName(String shoppingListName) {this.shoppingListName = shoppingListName;} public String getShoppingListName() {return shoppingListName;} public void setUsersMap(Map<String, String> usersMap) {this.usersMap = usersMap;} public Map<String, String>

问题 I'm trying to write data to Firebase Database but I keep receiving the following error when my saved button is pressed. 2016-12-02 11:09:42.548 StartupNow[1482:60415] [FirebaseDatabase] setValue: or removeValue: at /test/-KY-VpLZWbp4vjF3BpMk failed: permission_denied Things I've tried: I've made sure my .read and .write rules were set to true in my console, reconnected my savedButtonPressed button, and wrote the Firebase reference in a function and called it in my savedButtonPressed() method.

问题 I am currently trying to run multiple queries in firestore and want to wait for them to all complete before executing the next code. I've read up on several possible avenues but I have yet to find a good Android example. public HashMap<String,Boolean> multipleQueries(String collection, String field, final ArrayList<String> criteria) { HashMap<String,Boolean> resultMap = new HashMap<>(); for (int i = 0; i < criteria.size(); i++){ final int index = i; db.collection(collection).whereEqualTo

问题 SimpleDateFormat sdf = new SimpleDateFormat("dd-MM-yyyy HH:mm"); Calendar c = Calendar.getInstance(); String date = sdf.format(c.getTime()); i used this code to get the current time. but i want to get all data from firebase 1 month ago. what i must add the code? i used this code to retrieve all without compare anything mDatabasetamu.orderByChild("tglkeluar").equalTo(date).addListenerForSingleValueEvent(new ValueEventListener() { @Override public void onDataChange(@NonNull DataSnapshot

问题 I've a collection with contacts with a structure like: name: 'XPTO' emails: { susan@xpto.com: 'Susan', fred@xpto.com: 'Fred' } But the query will not return result: db.firestore().collection('contacts').where('emails.susan@xpto.com', '==', 'Susan').get().then(... Because of the dot at "susan@xpto.com" How to escape the dot? I've tried `` and [ ] and didn't work. 回答1: The documentation that suggests you should escape fields using backticks is actually not correct. It's in the process of being

问题 How can I order the documents in Firestore? It looks like Firestore lists documents in alphabetic order by the ID I let Firestore automatically create. But I don't want that. I just want to see my newly added document added as the last document in the collection. How do I do that? Should I create my own alphabetic ID's? Example of my collection in Firestore: 回答1: Firestore is meant to scale massively. At that scale, it doesn't matter what order the documents appear in the console, because the

问题 How to search the Firestore database for the location Latitude and Longitude within a defined distance radius. Sample Database: COMPANIES - COMPANY 1 --Lat: 12345 --Long: 6789 - COMPANY 2 --Lat: 457851 --Long: 654214 - COMPANY 3 --Lat: 12345 --Long: 6789 - COMPANY 4 --Lat: 12463 --Long: 65487 Note: At Real Time I had the option to use GeoFire, but at Firestore I did not find any way. How could you go through the database and find the Companies according to your Location, within a radius of

问题 How to search the Firestore database for the location Latitude and Longitude within a defined distance radius. Sample Database: COMPANIES - COMPANY 1 --Lat: 12345 --Long: 6789 - COMPANY 2 --Lat: 457851 --Long: 654214 - COMPANY 3 --Lat: 12345 --Long: 6789 - COMPANY 4 --Lat: 12463 --Long: 65487 Note: At Real Time I had the option to use GeoFire, but at Firestore I did not find any way. How could you go through the database and find the Companies according to your Location, within a radius of

问题 I first attempted to instantiate each user in the database like so: emails : { email: "jerry@gmail.com" { uid: "x" } } I quickly found out that I can't store an email because it has an @ and . . I was originally going to do an user look up like so: func userLookUpByEmail (email: String) -> String { var userID: String = "nil" ref.queryOrderedByChild("emails").queryEqualToValue(email).observeSingleEventOfType(.ChildAdded, withBlock: { snapshot in if snapshot.value != nil { print(snapshot.value)

问题 When writing event based cloud functions for firebase firestore it's common to update fields in the affected document, for example: When a document of users collection is updated a function will trigger, let's say we want to determine the user info state and we have a completeInfo: boolean property, the function will have to perform another update so that the trigger will fire again, if we don't use a flag like needsUpdate: boolean to determine if excecuting the function we will have an