Flutter 从Firestore到地图的颤振/飞镖投射
我在将数据从firestore映射到模型时遇到问题。 我已经尝试了几个小时,但总是会出现强制转换错误异常,例如“Map不能强制转换为Map”或“type”\u InternalLinkedHashMap“不是“Map”类型的子类型 我尝试了以下链接中的示例: 还有更多的人仍然不明白这是怎么回事 这是我的实体和模型类: 实体Flutter 从Firestore到地图的颤振/飞镖投射,flutter,dart,google-cloud-firestore,Flutter,Dart,Google Cloud Firestore,我在将数据从firestore映射到模型时遇到问题。 我已经尝试了几个小时,但总是会出现强制转换错误异常,例如“Map不能强制转换为Map”或“type”\u InternalLinkedHashMap“不是“Map”类型的子类型 我尝试了以下链接中的示例: 还有更多的人仍然不明白这是怎么回事 这是我的实体和模型类: 实体 import 'package:cloud_firestore/cloud_firestore.dart'; import 'package:equatable/equata
import 'package:cloud_firestore/cloud_firestore.dart';
import 'package:equatable/equatable.dart';
class ScreenHomeEntity extends Equatable {
final String id;
final String userName;
final String userEmail;
final String mainDoor;
final Map<dynamic, dynamic> doors;
const ScreenHomeEntity(
this.id, this.userName, this.userEmail, this.mainDoor, this.doors);
@override
List<Object> get props => [id, userName, userEmail, mainDoor, doors];
@override
String toString() =>
'ScreenHomeEntity {id: $id, userName: $userName, userEmail: $userEmail, mainDoor: $mainDoor, doors: $doors}';
Map<String, Object> toJson() {
return {
'id': id,
'userName': userName,
'userEmail': userEmail,
'mainDoor': mainDoor,
'doors': doors,
};
}
static ScreenHomeEntity fromJson(Map<String, Object> json) {
return ScreenHomeEntity(
json['id'] as String,
json['userName'] as String,
json['userEmail'] as String,
json['mainDoor'] as String,
json['doors'] as Map<dynamic, dynamic>,
);
}
Map<String, Object> toDocument() {
return {
'userName': userName,
'userEmail': userEmail,
'mainDoor': mainDoor,
'doors': doors,
};
}
static ScreenHomeEntity fromDocument(DocumentSnapshot doc) {
return ScreenHomeEntity(
doc.documentID,
doc.data['userName'],
doc.data['userEmail'],
doc.data['mainDoor'],
doc.data['doors'],
);
}
}
型号:
import 'package:brava_flutter/data/entities/screen_home_entity.dart';
import 'package:meta/meta.dart';
@immutable
class ScreenHome {
final String id;
final String userName;
final String userEmail;
final String mainDoor;
final Map<String, ScreenHomeDoor> doors;
ScreenHome(this.userName,
{String userEmail = '',
String id,
String mainDoor,
Map<String, ScreenHomeDoor> doors})
: this.userEmail = userEmail ?? '',
this.id = id,
this.mainDoor = mainDoor ?? '',
this.doors = doors ?? Map<String, ScreenHomeDoor>();
ScreenHome copyWith({
String id,
String userName,
String userEmail,
String mainDoor,
Map<String, ScreenHomeDoor> doors,
}) {
return ScreenHome(
userName ?? this.userName,
id: id ?? this.id,
userEmail: userEmail ?? this.userEmail,
mainDoor: mainDoor ?? this.mainDoor,
doors: doors ?? this.doors,
);
}
@override
int get hashCode =>
id.hashCode ^
userName.hashCode ^
userEmail.hashCode ^
mainDoor.hashCode ^
doors.hashCode;
@override
bool operator ==(Object other) =>
identical(this, other) ||
other is ScreenHome &&
runtimeType == other.runtimeType &&
id == other.id &&
userName == other.userName &&
userEmail == other.userEmail &&
mainDoor == other.mainDoor &&
doors == other.doors;
@override
String toString() =>
'ScreenHomeModel {id: $id, userName: $userName, userEmail: $userEmail, mainDoor: $mainDoor, doors: $doors}';
ScreenHomeEntity toEntity() =>
ScreenHomeEntity(id, userName, userEmail, mainDoor, doors);
static ScreenHome fromEntity(ScreenHomeEntity entity) {
return ScreenHome(
entity.userName,
id: entity.id,
userEmail: entity.userEmail,
mainDoor: entity.mainDoor,
doors: entity.doors, // EXCEPTION
);
}
}
class ScreenHomeDoor {
String name;
String address;
ScreenHomeDoor.fromMap(Map<dynamic, dynamic> data)
: name = data['name'],
address = data['address'];
}
firestore数据示例:
回答:
在模型中,方法“fromEntity”我并没有将实体映射动力学强制转换为模型映射对象,而模型映射对象正是发生异常的地方。
这个动态地图中的每一个值都应该被转换成object,而我一直在做错事
static ScreenHome fromEntity(ScreenHomeEntity entity) {
return ScreenHome(
entity.userName,
id: entity.id,
userEmail: entity.userEmail,
mainDoor: entity.mainDoor,
doors: entity.doors
.map((k, v) => MapEntry(k as String, ScreenHomeDoor.fromMap(v))),
);
}
在整个过程中,我一直试图使用MapEntryk作为字符串,v作为ScreenHomeDoor.fromMapv
一个简单而愚蠢的错误……回答:
在模型中,方法“fromEntity”我并没有将实体映射动力学强制转换为模型映射对象,而模型映射对象正是发生异常的地方。
这个动态地图中的每一个值都应该被转换成object,而我一直在做错事
static ScreenHome fromEntity(ScreenHomeEntity entity) {
return ScreenHome(
entity.userName,
id: entity.id,
userEmail: entity.userEmail,
mainDoor: entity.mainDoor,
doors: entity.doors
.map((k, v) => MapEntry(k as String, ScreenHomeDoor.fromMap(v))),
);
}
在整个过程中,我一直试图使用MapEntryk作为字符串,v作为ScreenHomeDoor.fromMapv
一个简单而愚蠢的错误……您错过了一些代码,但我看到可能存在类型不兼容的错误。难道你没有忘记使用ScreenHomeDoor.FromMap数据方法吗?能否从firebase控制台显示Firestore对象结构?如果我了解如何将地图从firestore数据结构转换为MapI添加图片,我可以帮助您。我没有忘记调用。fromMap ScreenHomeDoor,我用模型类中的“fromEntity”调用它,这就是我得到错误的地方。您错过了一些代码,但我看到了类型不兼容的可能错误。难道你没有忘记使用ScreenHomeDoor.FromMap数据方法吗?能否从firebase控制台显示Firestore对象结构?如果我了解如何将地图从firestore数据结构转换为MapI添加图片,我可以帮助您。我没有忘记调用。fromMap ScreenHomeDoor,我在模型类中用'fromEntity'调用它,这就是我得到错误的地方。