Reading and Storing data from Firebase realtime database in Flutter

Question

I have some data in the form of objects on my firebase rtdb, I just want to retrieve the data on my device and save it using the persistence method. I've been on this for a month now and looked out for a lot of possible solutions but that doesn't seem to help. Here is the structure of my data:

(Let me know if you require any missing piece of information)

Thanks in advance!

Edit #1

This is what I tried

class contact{
 final String name,desig,category,ip_direct,ip_office,ip_res,ll_off,ll_res,mob;

 contact({this.name,this.desig,this.category,
   this.ip_direct,this.ip_office,this.ip_res,this.ll_off,this.ll_res,this.mob});

 factory contact.fromJson(Map<dynamic, dynamic> json){
  return contact(
    name: json["Name"],
    desig: json["Design"],
    category: json["Category"],
    ip_direct: json["IP Direct"].toString(),
    ip_office: json["IP Office"].toString(),
    ip_res: json["IP Home"].toString(),
    ll_off: json["LL Office"].toString(),
    ll_res: json["LL Home"].toString(),
    mob: json["Mobile"].toString(),
  );
 }
}

Future<List<contact>> getList()async{
    final dbRef = FirebaseDatabase.instance.reference().child("Deans");
    List<contact> list=new List();
    DataSnapshot snap=await dbRef.once();
    List<dynamic> obj=snap.value;

    for(int i=0; i<obj.length; i++){
      list.add(contact.fromJson(obj[i]));
    }
    return list;
  }

I cannot persist data here

@Vinit_Saini you've shared the link for Firestore, which is diff from Realtime DB — Ayush Nanglia
– Ayush Nanglia, Commented Jul 1, 2021 at 6:57

Symhpony RN · Accepted Answer · 2021-12-12 10:26:48Z

2

I had the same problem and could not find the solution, until I looked inside the library file and the solution was simpler than I thought.

....
final Future<bool> db = FirebaseDatabase().setPersistenceEnabled(true);

final DatabaseReference _fechasRef =
  FirebaseDatabase.instance.reference().child('...');
....

The first line communicates that the data must be stored, because in firebase realtime database data persistence is not enabled by default.

answered Dec 12, 2021 at 10:26

Symhpony RN

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Comments

gbaccetta · Accepted Answer · 2021-07-01 05:57:42Z

0

Firebase realtime database is persistent by default and your code will work even off line once the data has been loaded at least once.

answered Jul 1, 2021 at 5:57

gbaccetta

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1 Comment

Ayush Nanglia Over a year ago

I believe what you're talking about is firestore, because i didn't find any such thing in realtime database. There is a feature for offline persistence in realtime DB, but by default it's turned off

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