Array type Field in firestore document to be converted to List of custom objects

Question

Data on my firebase looks like this:

I want to convert the LIST_OF_ALL_COLLEAGUES into a List but I am unable to figure out how to do it.

I have a user class which has this List colleagues field. My conversion code for user class looks like this:

import 'package:cloud_firestore/cloud_firestore.dart';
import 'package:snagsnapper/Contants/constants.dart';
import 'package:snagsnapper/Data/colleague.dart';

class User {
  User ({
    this.name,
    this.dateFormat,
    this.listOfALLColleagues,
  });

  String name;
  String dateFormat='dd-MM-yyyy';
  List<Colleague> listOfALLColleagues;

  User.fromMap(DocumentSnapshot data)
      : this(
    name: data[NAME],
    dateFormat: data[DATE_FORMAT],
    listOfALLColleagues: List<Colleague>.from(data[LIST_OF_COLLEAGUES]),
  );

  Map<String, dynamic> toJSON() => {
    NAME : name,
    DATE_FORMAT : dateFormat,
    LIST_OF_COLLEAGUES : listOfALLColleagues,
  };

}

My Colleague class looks like the following:

import 'package:cloud_firestore/cloud_firestore.dart';
import 'package:snagsnapper/Contants/constants.dart';

class Colleague {
  String name;
  String email;
  String phone;
  String uniqueID;

  Colleague({
    this.name,
    this.email,
    this.phone,
    this.uniqueID,
  });

  Colleague.fromMap(DocumentSnapshot data)
      : this(
    name: data[NAME],
    email: data[EMAIL],
    phone: data[PHONE],
    uniqueID: data[UID],
  );

  Map<String, dynamic> toJSON() => {
    NAME : name,
    EMAIL : email,
    PHONE : phone,
    UID : uniqueID,
  };
}

I have tried several methods I have seen online upto now but with no luck: I have tried:

listOfALLColleagues: List<Colleague>.from(data[LIST_OF_COLLEAGUES]),
listOfALLColleagues: List.from(data[LIST_OF_COLLEAGUES]),
listOfALLColleagues: List.castFrom(data[LIST_OF_COLLEAGUES]),
listOfALLColleagues: data[LIST_OF_COLLEAGUES] as List<Colleague>,
listOfALLColleagues: data[LIST_OF_COLLEAGUES]
        .map((value) {
          return Colleague.fromMap(value);
        }).toList(),

I know some of these are same things but I just want to mention them here.

Does this answer your question? Flutter Cloud Firestore Map<String, dynamic> error — Jan Hernandez
– Jan Hernandez, Commented Apr 29, 2020 at 19:37
Thanks. It seems I need to manually convert Colleague. But I am struggling to understand how to do it in code. — Damandroid
– Damandroid, Commented Apr 30, 2020 at 4:33

Damandroid · Accepted Answer · 2020-05-02 04:39:34Z

1

I managed to do it with Json-Serial library. I wasn't aware of this library earlier and it I found it so much easier this way.

answered May 2, 2020 at 4:39

Damandroid

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