How to Map Dynamic Map Object from Firestore into Flutter and from Flutter to Firestore?

Question

I'd like to convert a dynamic map object on Firestore into Flutter. Below is an example:

The map for blocked users can change. Sometimes, it may contain 3 blocked users Other times, it may contain 2.

Below is my current code:

    class UserModel {
      String userId;
      String bio;
    ///add in dynamic blockedusers mapping
    }
    
    UserModel(
          {
          this.userId,
          this.bio,
    ///add in dynamic blockedusers mapping
    }
    
    UserModel.fromJson(Map<dynamic, dynamic> map) {
        userId = map['userId'];
        bio = map['bio'];
    ///add in dynamic blockedusers mapping
    }
    
     toJson() {
        return {
          "userId": userId,
          'bio': bio,
    ///add in dynamic blockedusers mapping
    };
    }

Given that the map object changes, is there a way to dynamically map it from Firestore into Flutter or map it from Flutter into Firestore? Thanks in advance!

Hi Scott. You probable are using it, but to be sure I will ask. Are you using cloud_firestore and firebase_core libraries as dependencies to import and export from/to flutter? — Rodrigo
– Rodrigo, Commented Sep 7, 2021 at 12:49

Dan James · Accepted Answer · 2021-09-04 08:33:29Z

1

There are a few ways to do this, the easiest is just storing it as a Map on the UserModel.

Or in dart you can map through them the create a list of strings: List blockedUsers = blockedUsersFromDB.keys.toList().

Or if there is more information create a sub model with a static listfromjson:

class BlockedUser{
  final String id;
  BlockedUser({this.id});

  factory BlockedUser.fromMap(Map map){
    return BlockedUser(id: map['userId']);
  }

  static List<BlockedUser> listFromJson(Map<dynamic, dynamic> json){
    // adjust to your data set or to use the from map function above
    return json.keys.map((user) => BlockedUser(id: user));
  }

}

answered Sep 4, 2021 at 8:33

Dan James

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