Angular 使用模拟数据:Typescript不可分配给类型
我是Angular的新手,我相信我以错误的方式设置了模拟数据,这会导致以下错误:Angular 使用模拟数据:Typescript不可分配给类型,angular,typescript,Angular,Typescript,我是Angular的新手,我相信我以错误的方式设置了模拟数据,这会导致以下错误: Argument of type '{ "name": string; "refCode": string; "contentId": string; "enabled": boolean; }[]; } | { ...; }' is not assignable to parameter of type 'Item'. 已更新其他
Argument of type '{ "name": string; "refCode": string; "contentId": string; "enabled": boolean; }[]; } | { ...; }' is not assignable to parameter of type 'Item'.
已更新其他错误消息:
Types of property ... are incompatible.
Type '{ "name": string; "refCode": string; "contentId": string }[]' is not assignable to type 'Item[]'.
Property ... is missing in type '{ "name": string; "refCode": string; "contentId": string;}' but required in type 'Item'.
以下是我的json文件内容:
{
"data": {
"items": [
{
"obj1": "one",
"obj2": "two",
"obj3": three
},
{
"obj1": "four",
"obj2": "five",
"obj3": siix
"subCategories": [
{
}
]
},
{
"name": "Menu Option 1",
"refCode": "opt1",
"contentId": "0",
"subCategories": [
{}
]
},
{
"name": "Menu Option 2",
"refCode": "opt2",
"contentId": "0"
},
{
"name": "Menu Option 3",
"refCode": "opt3"
}
]
}
}
在我的服务类中,我按如下方式导入它:
import dataItems from './shared/my-items.json';
public menuItems: any;
并声明如下:
import dataItems from './shared/my-items.json';
public menuItems: any;
然后我在我的组件类中迭代这里的项目:
const optionData =
this.itemService.getMenuItems().data.items;
const resource = {};
if (itemData && itemData.length > 0) {
this.items = [];
itemData.forEach(element => {
this.itemService.applyItemName(
element
);
this.items.push(element
});
this.itemService.categories = this.itemss;
}
最后是applyItemName()方法,它为给定项添加项及其子项:
public applyItemName(item: Item) {
if (item.subCategories && item.subCategories.length > 0) {
item.subCategories.forEach(subCategory => {
subCategory.parent = category;
this.applyItemName(subCategory);
});
}
}
项目对象的模型如下所示:
export class Category {
public subCategories: Items[];
public contentId: string;
constructor(subCategories: Item[], enabled: boolean, name: string)
{
this.subCategories = subCategories;
this.enabled = enabled;
this.name = name;
}
}
正如我所说的,我是新来的,我不确定我错过了什么。非常感谢任何提示。我认为存在的问题是
儿童类别
应该是可选的,因为在对象中的某些儿童中,它不存在。在声明中添加?
将使其成为可选的:
export class Category {
public childCategories?: Category[];
或者,您可以始终将childCategories初始化为空数组
public childCategories: Category[] = [];
错误应该包括一条关于为什么它不可赋值的消息,通常是“缺少参数Foo”之类的。我会把错误信息的缺失部分添加到帖子中。就是这样-谢谢。之前的评论者提醒我其他错误消息,我已经用这些消息更新了原始帖子。非常感谢你。