Flutter 配置单元数据库不保存嵌套对象
你好，我有一个应用程序，用户可以创建主要类别的子类别。当用户创建主类别时，主对象保存到数据库中，在我重新打开应用程序后，我可以看到它们，但当我为指定主类别的子类别创建时，我可以在子类别屏幕中看到，但当我重新打开应用程序时，我可以看到唯一的主类别，我猜子类别无法保存到数据库中，我使用Hive将数据存储到手机中，有人能解释一下为什么我不能将子对象保存到DB中，以及我如何做到这一点。我结巴了谢谢你的帮助 我共享主类别屏幕，使em显示主类别Flutter 配置单元数据库不保存嵌套对象,flutter,Flutter,你好，我有一个应用程序，用户可以创建主要类别的子类别。当用户创建主类别时，主对象保存到数据库中，在我重新打开应用程序后，我可以看到它们，但当我为指定主类别的子类别创建时，我可以在子类别屏幕中看到，但当我重新打开应用程序时，我可以看到唯一的主类别，我猜子类别无法保存到数据库中，我使用Hive将数据存储到手机中，有人能解释一下为什么我不能将子对象保存到DB中，以及我如何做到这一点。我结巴了谢谢你的帮助 我共享主类别屏幕，使em显示主类别 class HomeScreen extends Statef
class HomeScreen extends StatefulWidget {
HomeScreen({this.newCategoryName,this.newCategoryImagePath});
final String newCategoryImagePath;
final String newCategoryName;
static String id="homeScreen";
@override
_HomeScreenState createState() => _HomeScreenState();
}
class _HomeScreenState extends State<HomeScreen> {
Widget buildBottomSheet(BuildContext context)=>AddMenuScreen(buttonText: "Menü Ekle",route: "homeScreen");
int _flag=0;
Box<CategoryModel> _categoryModelsBox;
void initState(){
super.initState();
_categoryModelsBox = Hive.box<CategoryModel>("categoryModelsInBox");
if (widget.newCategoryName!=null && widget.newCategoryImagePath!=null){
CategoryModel newCategoryModel = CategoryModel(categoryId:categoryModels.length, categoryImagePath: widget.newCategoryImagePath,
categoryName: widget.newCategoryName,categoryColor: Color((Random().nextDouble() * 0xFFFFFF).toInt()).withOpacity(0.5).value);
categoryModels.insert(categoryModels.length,newCategoryModel);
_categoryModelsBox.add(newCategoryModel);
}
}
Future<bool> showAlertDialog(BuildContext context){
AlertDialog alert = AlertDialog(
backgroundColor: kColorTheme10,
elevation: 0,
content: Container(decoration:BoxDecoration(
border: Border.all(style: BorderStyle.solid,width: 1),
color: Colors.white70.withOpacity(0.7),
borderRadius: BorderRadius.circular(15)
), child: Padding(
padding: EdgeInsets.all(8.0),
child: Text(
"Çıkmak istediğinizden emin misiniz?",
style: TextStyle(
fontSize: 25,
fontFamily: "OpenSans")
),
),
),
shape: RoundedRectangleBorder(borderRadius: BorderRadius.circular(30)),
actions: [
Container(
decoration: BoxDecoration(
color: Colors.white70.withOpacity(0.7),
borderRadius: BorderRadius.circular(30)
),
child: TextButton(onPressed:()async{
Navigator.of(context).pop(true);
},
child: Padding(
padding: const EdgeInsets.all(8.0),
child: Text("EVET",style: TextStyle(fontWeight: FontWeight.bold,fontFamily: "OpenSans"),),
)),
),
Container(
decoration: BoxDecoration(
color:Colors.white70.withOpacity(0.7),
borderRadius: BorderRadius.circular(30)
),
child: TextButton(onPressed:()async{
Navigator.of(context).pop(false);
},
child: Padding(
padding: const EdgeInsets.all(8.0),
child: Text("HAYIR",style: TextStyle(fontWeight: FontWeight.bold, fontFamily: "OpenSans")),
),
),
),
],
);
return showDialog(
context: context,
builder: (_)=>alert);
}
@override
Widget build(BuildContext context) {
return WillPopScope(
child: SafeArea(
child: Scaffold(
backgroundColor: kColorTheme1,
appBar: AppBar(
centerTitle: true,
automaticallyImplyLeading: false,
elevation: 20,
backgroundColor: Color(0xFFF2C3D4).withOpacity(1),
title:TitleBorderedText(title:"Sevimli Yemekler", textColor: Color(0xFFFFFB00)),
actions: [
CircleAvatar(
radius: 27,
backgroundColor: Colors.transparent,
backgroundImage: AssetImage(kCuttedLogoPath),
),
],
),
body: Container(
decoration: BoxDecoration(
image: DecorationImage(
image: AssetImage(kBGWithLogoOpacity),
fit: BoxFit.cover,
),
),
child: Column(
crossAxisAlignment: CrossAxisAlignment.stretch,
children: [
Expanded(
child:GridView.builder (
scrollDirection: Axis.vertical,
gridDelegate: SliverGridDelegateWithFixedCrossAxisCount(crossAxisCount: 2),
itemCount: _categoryModelsBox.length+1,
itemBuilder: (context,index) {
if(_categoryModelsBox.length==0){
return EmptyCard(where: "homeScreen",);
}
if(_flag==1){
return EmptyCard(where: "homeScreen",);
}
if(index==_categoryModelsBox.length-1){
_flag=1;
CategoryModel categoryModel = _categoryModelsBox.getAt(index);
return CategoryCard(category: categoryModel);
}
else{
CategoryModel categoryModel = _categoryModelsBox.getAt(index);
return CategoryCard(category: categoryModel);
}
}
),
),
Column(
mainAxisAlignment: MainAxisAlignment.end,
crossAxisAlignment: CrossAxisAlignment.stretch,
children: [
Padding(
padding: EdgeInsets.all(10),
child: Container(
decoration: BoxDecoration(
border: Border.all(style: BorderStyle.solid),
color: kColorTheme7,
borderRadius: BorderRadius.circular(40),
),
child: TextButton(
onPressed: (){
showModalBottomSheet(
isDismissible: false,
enableDrag: false,
context: context,
builder: (BuildContext context)=> AddMenuScreen(buttonText: "Menü Ekle",route: "homeScreen",),
);
},
child: TitleBorderedText(title: "LEZZET GRUBU EKLE",textColor: Colors.white,)
),
),
),
],
)
],
),
)
),
),
onWillPop: ()async{
var response = await showAlertDialog(context);
print(response);
return response;
},
);
}
}
类主屏幕扩展StatefulWidget{
主屏幕（{this.newCategoryName，this.newCategoryImagePath}）；
最终字符串newCategoryImagePath；
最终字符串newCategoryName；
静态字符串id=“主屏幕”；
@凌驾
_HomeScreenState createState（）=>\u HomeScreenState（）；
}
类_homescrenstate扩展状态{
小部件buildBottomSheet（BuildContext上下文）=>AddMenuScreen（按钮文本：“MenüEkle”，路径：“主屏幕”）；
int _标志=0；
箱子(类别)模型箱;；
void initState（）{
super.initState（）；
_categoryModelsBox=Hive.box（“categoryModelsBox”）；
if（widget.newCategoryName！=null&&widget.newCategoryImagePath！=null）{
CategoryModel newCategoryModel=CategoryModel（categoryId:categoryModels.length，categoryImagePath:widget.newCategoryImagePath，
categoryName:widget.newCategoryName，categoryColor:Color（（Random（）.nextDouble（）*0xFFFFFF）.toInt（））。不透明度（0.5）.value）；
categoryModels.insert（categoryModels.length，newCategoryModel）；
_添加（newCategoryModel）；
}
}
Future showAlertDialog（构建上下文）{
AlertDialog alert=AlertDialog(
背景颜色：kColorTheme10，
海拔：0，
内容：容器（装饰：盒子装饰）(
边框：边框。全部（样式：边框样式。实心，宽度：1），
颜色：颜色。白色70。不透明度（0.7），
边界半径：边界半径。圆形（15）
)，child:Padding(
填充：边缘设置。全部（8.0），
子：文本(
“ıkmak istediğinden emin Misiz？”，
样式：TextStyle(
尺寸：25，
fontFamily：“OpenSAN”）
),
),
),
形状：RoundedRectangleBorder（borderRadius:borderRadius.circular（30）），
行动：[
容器(
装饰：盒子装饰(
颜色：颜色。白色70。不透明度（0.7），
边界半径：边界半径。圆形（30）
),
子项：文本按钮（按下时：（）异步{
Navigator.of（context.pop）（true）；
},
孩子：填充(
填充：常数边集全部（8.0），
子项：文本（“EVET”，样式：TextStyle（fontWeight:fontWeight.bold，fontFamily:“OpenSans”），
)),
),
容器(
装饰：盒子装饰(
颜色：颜色。白色70。不透明度（0.7），
边界半径：边界半径。圆形（30）
),
子项：文本按钮（按下时：（）异步{
Navigator.of（context.pop）（false）；
},
孩子：填充(
填充：常数边集全部（8.0），
子项：文本（“HAYIR”，样式：TextStyle（fontWeight:fontWeight.bold，fontFamily:“OpenSans”），
),
),
),
],
);
返回显示对话框(
上下文：上下文，
生成器：（）=>警报）；
}
@凌驾
小部件构建（构建上下文）{
返回式示波器(
儿童：安全区(
孩子：脚手架(
背景颜色：kColorTheme1，
appBar:appBar(
标题：对，
自动嵌入：false，
海拔：20，
背景颜色：颜色（0xFFF2C3D4）。不透明度（1），
标题：标题有序文本（标题：“Sevimli Yemekler”，文本颜色：颜色（0xFFFFFB00）），
行动：[
圆形(
半径：27，
背景颜色：颜色。透明，
背景图片：AssetImage（kCuttedLogoPath），
),
],
),
主体：容器(
装饰：盒子装饰(
图像：装饰图像(
图像：AssetImage（kBGWithLogoOpacity），
适合：BoxFit.cover，
),
),
子：列(
crossAxisAlignment:crossAxisAlignment.stretch，
儿童：[
扩大(
子项：GridView.builder(
滚动方向：轴垂直，
gridDelegate:SliverGridDelegateWithFixedCrossAxisCount（crossAxisCount:2），
itemCount:_categoryModelsBox.length+1，
itemBuilder：（上下文，索引）{
如果（_categoryModelsBox.length==0）{
返回空卡片（其中：“主屏幕”）；
}
如果（_标志==1）{
返回空卡片（其中：“主屏幕”）；
}
如果（索引==_categoryModelsBox.length-1）{
_flag=1；
CategoryModel CategoryModel=\u categoryModelsBox.getAt（索引）；
返回CategoryCard（类别：categoryModel）；
}
否则{
CategoryModel CategoryModel=\u categoryModelsBox.getAt（索引）；
返回CategoryCard（类别：categoryModel）；
}
}
class SubCategoriesScreen extends StatefulWidget {
SubCategoriesScreen({this.categoryId,this.subCategoryName, this.subCategoryImagePath});
static String id="subCategoriesScreen";
final String subCategoryName;
final String subCategoryImagePath;
final int categoryId;
Widget buildBottomSheet(BuildContext context)=>AddMenuScreen(categoryId: categoryId,buttonText: "Tarif Ekle",route: "subCategoryScreen",);
@override
_SubCategoriesScreenState createState() => _SubCategoriesScreenState();
}
class _SubCategoriesScreenState extends State<SubCategoriesScreen> {
int _flag=0;
Box<CategoryModel> _categoryModelBox;
CategoryModel _categoryModel;
void initState(){
super.initState();
_categoryModelBox = Hive.box<CategoryModel>("categoryModelsInBox");
_categoryModel = _categoryModelBox.getAt(widget.categoryId);
if(widget.categoryId!=null && widget.subCategoryImagePath!=null && widget.subCategoryName!=null){
addSubCategory();
}
}
void addSubCategory()async{
SubCategoryModel subCategoryModel=SubCategoryModel(
subCategoryId:widget.categoryId,
subCategoryImagePath: widget.subCategoryImagePath,
subCategoryName: widget.subCategoryName,
categoryColor: Color((Random().nextDouble() * 0xFFFFFF).toInt()).withOpacity(0.5).value);
if(_categoryModel.subCategoryModels!=null){
//for (var categoryModel in categoryModels){
//if (categoryModel.categoryId == subCategoryModel.subCategoryId){
//categoryModel.subCategoryModels.insert(categoryModel.subCategoryModels.length-1,subCategoryModel);
//categoryModel.subCategoryModels.add(subCategoryModel);
_categoryModel=_categoryModelBox.getAt(widget.categoryId);
_categoryModel.subCategoryModels.add(subCategoryModel);
_categoryModelBox.putAt(widget.categoryId, _categoryModel);
//}
//}
}
}
@override
Widget build(BuildContext context) {
return SafeArea(
child: Scaffold(
body: Scaffold(
appBar: AppBar(
automaticallyImplyLeading: false,
centerTitle: true,
title: BorderedText(
child:Text(
_categoryModel.categoryName,
style: TextStyle(
color: Color(0XFFFFFB00),
fontSize: 30,
fontFamily: "OpenSans"
),
),
strokeWidth: 5,
strokeColor: Colors.black,
),
elevation: 5,
backgroundColor: Color(0xFFF2C3D4).withOpacity(1),
leading: IconButton(
icon: Icon(Icons.arrow_back),
onPressed: (){
Navigator.pop(context);
},
iconSize: 40,
color: Color(0xFFA2000B),
),
actions: [
CircleAvatar(
radius: 27,
backgroundColor: Colors.transparent,
backgroundImage: AssetImage("images/cuttedlogo.PNG"),
)
],
),
body:Container(
decoration: BoxDecoration(
image: DecorationImage(
image: AssetImage("images/logoBGopacity.png"),
fit: BoxFit.cover,
),
),
child: Column(
crossAxisAlignment: CrossAxisAlignment.stretch,
children: [
Expanded(
child: GridView.builder(
scrollDirection: Axis.vertical,
gridDelegate: SliverGridDelegateWithFixedCrossAxisCount(crossAxisCount: 2),
itemCount:_categoryModel.subCategoryModels.length+1,
itemBuilder: (context,index){
if(_categoryModel.subCategoryModels.length==0){
return EmptyCard(where: "subCategoryScreen",categoryId: widget.categoryId,);
}
if(_flag==1){
return EmptyCard(where: "subCategoryScreen",categoryId: widget.categoryId,);
}
if(index==_categoryModel.subCategoryModels.length-1){
_flag=1;
SubCategoryModel subCategoryModel =_categoryModel.subCategoryModels[index];
return SubCategoryCard(subCategoryCardId:index,subCategoryId:subCategoryModel.subCategoryId,subcategoryName: subCategoryModel.subCategoryName,
subCategoryImagePath:subCategoryModel.subCategoryImagePath,
subCategoryCardColor: subCategoryModel.categoryColor,);
}
else{
SubCategoryModel subCategoryModel =_categoryModel.subCategoryModels[index];
return SubCategoryCard(subCategoryCardId:index,subCategoryId:subCategoryModel.subCategoryId,subcategoryName: subCategoryModel.subCategoryName,
subCategoryImagePath:subCategoryModel.subCategoryImagePath,
subCategoryCardColor: subCategoryModel.categoryColor,);
}
}
),
),
Column(
mainAxisAlignment: MainAxisAlignment.end,
crossAxisAlignment: CrossAxisAlignment.stretch,
children: [
Padding(
padding: EdgeInsets.all(10),
child: Container(
decoration: BoxDecoration(
border: Border.all(style: BorderStyle.solid),
color: kColorTheme7,
borderRadius: BorderRadius.circular(40),
),
child: TextButton(
onPressed: (){
showModalBottomSheet(
isDismissible: false,
enableDrag: false,
context: context,
builder: (BuildContext context)=> AddMenuScreen(categoryId:widget.categoryId,buttonText: "Tarif Ekle", route:"subCategoryScreen"),
);
},
child: BorderedText(
strokeWidth: 5,
strokeColor: Colors.black,
child:Text("Tarif Ekle",style: TextStyle(
color: Colors.white,
fontFamily:'OpenSans',
fontSize:30,
),
),
),
),
),
),
],
)
],
),
),
)
),
);
}
}
part 'categoryModel.g.dart';
@HiveType(typeId : 0)
class CategoryModel extends HiveObject{
CategoryModel(
{ this.categoryId,
this.categoryImagePath,
this.categoryName,
this.categoryColor});
@HiveField(0)
final int categoryColor;
@HiveField(1)
List <SubCategoryModel> subCategoryModels=[];
@HiveField(2)
int categoryId;
@HiveField(3)
String categoryImagePath;
@HiveField(4)
String categoryName;
}
// GENERATED CODE - DO NOT MODIFY BY HAND
part of 'categoryModel.dart';
// **************************************************************************
// TypeAdapterGenerator
// **************************************************************************
class CategoryModelAdapter extends TypeAdapter<CategoryModel> {
@override
final int typeId = 1;
@override
CategoryModel read(BinaryReader reader) {
final numOfFields = reader.readByte();
final fields = <int, dynamic>{
for (int i = 0; i < numOfFields; i++) reader.readByte(): reader.read(),
};
return CategoryModel(
categoryId: fields[2] as int,
categoryImagePath: fields[3] as String,
categoryName: fields[4] as String,
categoryColor: fields[0] as int,
//subCategoryModels: (fields[1] as List)?.cast<SubCategoryModel>()
);
}
@override
void write(BinaryWriter writer, CategoryModel obj) {
writer
..writeByte(5)
..writeByte(0)
..write(obj.categoryColor)
..writeByte(1)
..write(obj.subCategoryModels)
..writeByte(2)
..write(obj.categoryId)
..writeByte(3)
..write(obj.categoryImagePath)
..writeByte(4)
..write(obj.categoryName);
}
@override
int get hashCode => typeId.hashCode;
@override
bool operator ==(Object other) =>
identical(this, other) ||
other is CategoryModelAdapter &&
runtimeType == other.runtimeType &&
typeId == other.typeId;
}
part 'subCategoryModel.g.dart';
@HiveType(typeId : 1)
class SubCategoryModel extends HiveObject{
SubCategoryModel({
this.subCategoryId,
this.subCategoryImagePath,
this.subCategoryName,
this.categoryColor,
this.recipeId,
List<Ingredient>ingredients,
this.recipePhotoDir,
this.recordedVoiceDir,
bool isCompeted});
@HiveField(0)
final int categoryColor;
@HiveField(1)
final double recipeId;
@HiveField(2)
bool isCompleted;
@HiveField(3)
int subCategoryId;
@HiveField(4)
String subCategoryImagePath;
@HiveField(5)
String subCategoryName;
@HiveField(6)
List <Ingredient> ingredients=[] ;
@HiveField(7)
String recipePhotoDir;
@HiveField(8)
String recordedVoiceDir;
}
// GENERATED CODE - DO NOT MODIFY BY HAND
part of 'subCategoryModel.dart';
// **************************************************************************
// TypeAdapterGenerator
// **************************************************************************
class SubCategoryModelAdapter extends TypeAdapter<SubCategoryModel> {
@override
final int typeId = 2;
@override
SubCategoryModel read(BinaryReader reader) {
final numOfFields = reader.readByte();
final fields = <int, dynamic>{
for (int i = 0; i < numOfFields; i++) reader.readByte(): reader.read(),
};
return SubCategoryModel(
subCategoryId: fields[3] as int,
subCategoryImagePath: fields[4] as String,
subCategoryName: fields[5] as String,
categoryColor: fields[0] as int,
recipeId: fields[1] as double,
ingredients: (fields[6] as List)?.cast<Ingredient>(),
recipePhotoDir: fields[7] as String,
recordedVoiceDir: fields[8] as String,
)..isCompleted = fields[2] as bool;
}
Hive.registerAdapter(ChildAdapter());
Hive.registerAdapter(ParentAdapter());
Hive.registerAdapter(ParentAdapter());
Hive.registerAdapter(ChildAdapter());