Question 184906 in Flutter Question posted in
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type 'String' is not a subtype of type 'Map<dynamic, dynamic>' in type cast Flutter realtime database

enter image description hereWhen i create a realtime database table, then i get the table datas, but i got and i changed the method and tried Map data = snapshot.value as Map

HERE is THE ERROR

    import 'dart:convert';

import 'package:firebase_database/firebase_database.dart';
import 'package:firebase_database/ui/firebase_animated_list.dart';
import 'package:flutter/cupertino.dart';
import 'package:flutter/material.dart';

class AmbobaDetals extends StatefulWidget {
  final double width;

  final EdgeInsets paddingForName;
  final EdgeInsets paddingForprice;
  final EdgeInsets paddingForstroke;
  final EdgeInsets paddingForunfildPrice;
  AmbobaDetals({
    super.key,
    required this.paddingForName,
    required this.paddingForprice,
    required this.paddingForstroke,
    required this.paddingForunfildPrice,
    required this.width,
  });

  @override
  State<AmbobaDetals> createState() => _AmbobaDetalsState();
}

class _AmbobaDetalsState extends State<AmbobaDetals> {
  Query dreamA = FirebaseDatabase.instance.ref().child('anboba');

  Widget listingOrder({required Map data}) => Padding(
      padding: const EdgeInsets.only(top: 15, bottom: 15),
      child: Container(
        child: Column(mainAxisAlignment: MainAxisAlignment.center, children: [
          Text(data['name']),
          // Text(data['adress']),
        ]),
      ));

  @override
  Widget build(BuildContext context) {
    return Scaffold(
        body: SizedBox(
      height: double.infinity,
      child: FirebaseAnimatedList(
        query: dreamA,
        itemBuilder: (BuildContext context, DataSnapshot snapshot,
            Animation<double> animation, int index) {
          Map<String, dynamic> data =
              Map<String, dynamic>.from(snapshot.value as Map);
          return listingOrder(data: data);
        },
      ),
    ));
  }
}

here is it

  "anboba": {
    "name": "ANBOBA",
    "price": 117,
    "stoke": "In stock",
    "unfild price": 1400
  },
  "drivers": {
    "2Y6gMoLreHgcyQRMSmhhN3zn09m2": {
      "email": "[email protected]",
      "id": "2Y6gMoLreHgcyQRMSmhhN3zn09m2",
      "name": "mohamedasd sdahhhh"
    },
    "C2NawPLYJgVWBt5ckhawM87xuSJ3": {
      "email": "[email protected]",
      "id": "C2NawPLYJgVWBt5ckhawM87xuSJ3",
      "name": "mohamedasd sda"
    },
    "eO5LVXmXCvaMtI10r3QzmkR4srJ2": {
      "email": "[email protected]",
      "id": "eO5LVXmXCvaMtI10r3QzmkR4srJ2",
      "name": "mohamedasd sda"
    },
    "hzucHzMeIqftErhGJEINEBkzOI82": {
      "email": "[email protected]",
      "id": "hzucHzMeIqftErhGJEINEBkzOI82",
      "name": "mohamed"
    },
    "jUv2wGQtB5PZlJdVcyGnLdskW0w2": {
      "email": "[email protected]",
      "id": "jUv2wGQtB5PZlJdVcyGnLdskW0w2",
      "name": "mohamedasd sdahhhh"
    },
    "null": {
      "AjlVieBNXeaArW1BvESDQHlCTJB2": {
        "adress": "492F+JP4, Sheraton Al Matar, Cairo Governorate, Egypt",
        "age": "https://www.google.com/maps/search/30.0993217,31.3744967",
        "key": "AjlVieBNXeaArW1BvESDQHlCTJB2",
        "name": "AjlVieBNXeaArW1BvESDQHlCTJB2"
      }
    }
  },
  "finshed orders": {
    "2Y6gMoLreHgcyQRMSmhhN3zn09m2": {
      "AjlVieBNXeaArW1BvESDQHlCTJB2": {
        "adress": "3 Omar Ibn El-Khattab, Sheraton Al Matar, Cairo Governorate, Egypt",
        "age": "https://www.google.com/maps/search/30.0993217,31.3744967",
        "key": "AjlVieBNXeaArW1BvESDQHlCTJB2",
        "name": "AjlVieBNXeaArW1BvESDQHlCTJB2"
      }
    },
    "ILk7xyDa3aYfU7BKhIMK3gPO9Rp2": {
      "eeJ9AaueVpfPK2zG7joXc63pXXm1": {
        "adress": "Garcia & Amphitheater, Mountain View, California, United States",
        "age": "https://www.google.com/maps/search/37.4219983,-122.084",
        "key": "eeJ9AaueVpfPK2zG7joXc63pXXm1",
        "name": "eeJ9AaueVpfPK2zG7joXc63pXXm1"
      }
    }
  },
  "orders": {
    "2Y6gMoLreHgcyQRMSmhhN3zn09m2": {
      "AjlVieBNXeaArW1BvESDQHlCTJB2": {
        "adress": "3 Omar Ibn El-Khattab, Sheraton Al Matar, Cairo Governorate, Egypt",
        "age": "https://www.google.com/maps/search/30.0993217,31.3744967",
        "key": "AjlVieBNXeaArW1BvESDQHlCTJB2",
        "name": "AjlVieBNXeaArW1BvESDQHlCTJB2"
      }
    },
    "ILk7xyDa3aYfU7BKhIMK3gPO9Rp2": {
      "eeJ9AaueVpfPK2zG7joXc63pXXm1": {
        "adress": "Garcia & Amphitheater, Mountain View, California, United States",
        "age": "https://www.google.com/maps/search/37.4219983,-122.084",
        "key": "eeJ9AaueVpfPK2zG7joXc63pXXm1",
        "name": "eeJ9AaueVpfPK2zG7joXc63pXXm1"
      }
    }
  },
  "users": {
    "29wineAudEUQVWuAMGhVG4BwxRI3": {
      "email": "[email protected]",
      "id": "29wineAudEUQVWuAMGhVG4BwxRI3",
      "name": "mohamed ashmawu"
    },
    "2IlB5okTH0UQaGKgZcJXl3KBQGU2": {
      "adress": "39XF+MMM, Sheraton Al Matar, Cairo Governorate, Egypt",
      "age": "https://www.google.com/maps/search/30.0995815,31.3744942",
      "key": "2IlB5okTH0UQaGKgZcJXl3KBQGU2",
      "name": "2IlB5okTH0UQaGKgZcJXl3KBQGU2"
    },
    "3jTJdBMZ7TZFzKOXwMpd6CIcB9B2": {
      "email": "[email protected]",
      "id": "3jTJdBMZ7TZFzKOXwMpd6CIcB9B2",
      "name": "mohamed ashmawu"
    },
    "8NHp1Hn3sFdS9n3wfiKN4baJnBi2": {
      "email": "[email protected]",
      "id": "8NHp1Hn3sFdS9n3wfiKN4baJnBi2",
      "name": "mohamed ashmawu"
    },
    "AjlVieBNXeaArW1BvESDQHlCTJB2": {
      "adress": "3 Omar Ibn El-Khattab, Sheraton Al Matar, Cairo Governorate, Egypt",
      "age": "https://www.google.com/maps/search/30.0993217,31.3744967",
      "key": "AjlVieBNXeaArW1BvESDQHlCTJB2",
      "name": "AjlVieBNXeaArW1BvESDQHlCTJB2"
    },
    "ILk7xyDa3aYfU7BKhIMK3gPO9Rp2": {
      "email": "[email protected]",
      "id": "ILk7xyDa3aYfU7BKhIMK3gPO9Rp2",
      "name": "mohamed"
    },
    "JbrFC0GcggPChc2Knwl0l9nCN1p2": {
      "email": "[email protected]",
      "id": "JbrFC0GcggPChc2Knwl0l9nCN1p2",
      "name": "mohamed ashmawu"
    },
    "aXWMaF8JEkYnfnOvJ6qjNpM9npl2": {
      "email": "[email protected]",
      "id": "aXWMaF8JEkYnfnOvJ6qjNpM9npl2",
      "name": "mohaeefd fdasante"
    },
    "b7ninYWGEcRThTNjmZKakKYwR443": {
      "email": "[email protected]",
      "id": "b7ninYWGEcRThTNjmZKakKYwR443",
      "name": "mohamed"
    },
    "eeJ9AaueVpfPK2zG7joXc63pXXm1": {
      "email": "[email protected]",
      "id": "eeJ9AaueVpfPK2zG7joXc63pXXm1",
      "name": "mohamed saeed ashmawy"
    }
  }
}

……………………………………………………………………………………..

here is it dfdfdff dfdsfgdg dfgsgdsfgfdg gfdgfdgfdg
sdfsdf sfd sdf dsf sdfs ddfdf dfdf s ffsfdfsdf sd sdf sdf ds fsdf sdf

Tags:

2

Answers


  1. 0

    I’m not going to read through all the documentation of the firebase package (I don’t use firebase), but the Map.from function is designed to create a map from another map, which is evidently not what snapshot.value is. Since it seems like you’re recieving a string, i’ll assume it’s json. You should instead use Map<String, dynamic>.from(json.decode(snapshot.value));

    You will need to import json by putting import 'dart:convert' show json; at the top of your file.

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  2. 0

    Your anboba node contains a single element with a number of properties (name, price, etc). When you use that in a FirebaseAnimatedList, your itemBuilder gets called with a snapshot being one individual property each time.

    So snapshot.value is a single value each time your itemBuilder gets called. The first time, it’ll be "ANBOBA", the second call, it’s 117, etc.

    You are trying to cast that single value to a Map here:

    Map<String, dynamic>.from(snapshot.value as Map)

    And that won’t work, because the single value isn’t a map.

    You commented that you did this before and it worked. My best guess is that you then used this approach on a data structure like the one you have under drivers. There you have a list of child elements, each of which has a number of properties.

    When you use FirebaseAnimatedList on that, you itemBuilder gets called with a snapshot of a single driver, so with multiple properties. And in that case, the value of the snapshot is indeed a Map of values.

    The most likely solution is to change your data structure to match what you have under Drivers – so add an extra child level into your JSON, e.g.:

    "Products": {
  "anboba": {
    "name": "ANBOBA",
    "price": 117,
    "stoke": "In stock",
    "unfild price": 1400
  },
}

    Now you can create the FirebaseAnimatedList on the Products node, and you code will work better.

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