Firestore - 添加带有数组的对象 [英] Firestore - adding object with an array

问题描述

整天在这里用这东西杀死自己，我有两个课程部门和文章:

killing myself with this thing in here all day, I'm having two classes Department and Articals :

export class Department {
articals?: Artical[]=[];
moms?: number;
id?: string;
constructor() {
}
}

和:

export class Artical {

moms?: number;
price: number;
name?: string;

constructor() {
}
}

喜欢你可以看到部门包含一个文章"数组所以我正在用新的文章(及其属性)建立新的部门，并尝试将其添加到 fireStore 中:

like You can see departments contains an Array of 'Articals' so I am building new Department with new articals(and their properties) and trying to add it to fireStore with:

this.departmetsCollection.doc(departmentId).set(Object.assign({}, 
myDepartment));

但收到错误:使用无效数据调用函数 DocumentReference.set().不支持的字段值:自定义 Artical 对象"

but getting Error : "Function DocumentReference.set() called with invalid data. Unsupported field value: a custom Artical object"

P.s 尝试只将文章数组添加到部门路径中

P.s tryed add only array of articals to the path of department as

doc(departmentId).set({'articals':myArticals});

并且使用更新"而不是设置"但也没有帮助:S将这种对象添加到 firestore 中的正确做法是什么?

and with 'update' instead of 'set' but no help either:S what is teh correct of adding that kind of object to firestore?

推荐答案

Firestore 只接受嵌入在文档中的 JavaScript 对象，前提是它是纯"对象，这意味着在 TypeScript 中开发时不能使用自定义对象.因此，您必须先映射您的对象，然后再将它们推送到 articals 数组.

Firestore only accepts a JavaScript object embedded within a document if it is a "pure" object, this means you can't use custom objects while developing in TypeScript. So you would have to map your objects before push them to the articals array.

首先改变你的系类:

export class Department {
articals?: Array<any>=[];
moms?: number;
id?: string;
constructor() {
}
}

第二个映射你的Artical"数组:

Second map your array of "Artical":

var map = arrayOfArtical.map((obj)=> {return Object.assign({}, obj)});

然后您可以将地图值归因于'this.myDepartment.articals'

Then you can attribute the map value to 'this.myDepartment.articals'

this.myDepartment.articals  = map;

之后就可以执行了:

this.departmetsCollection.doc(departmentId).set(Object.assign({}, 
myDepartment))

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