从 firestore 返回嵌套集合作为 angularfire2 和 firebase 的对象 [英] Return nested collection from firestore as object for angularfire2 and firebase

问题描述

假设您有以下结构:

shopping-carts(集合)- 购物车 1(doc)-- 日期创建(字段)-- 物品(集合)- 购物车 2(doc-  创建日期-  项目...

那么，我们如何将整个购物车(doc)作为我们定义为的 ShoppingCart 对象

导出接口 ShoppingCart {项目:ShoppingCartItem[]日期创建:字符串}

afs.doc('shopping-cart/id').valueChanges() 只返回创建日期

afs.doc('shopping-cart/id').collection('items').valueChanges() 返回商品.

将所有内容合而为一并将其创建为对象的简单方法?

解决方案

可能不是最好的解决方案，但目前还找不到更好的解决方案.

this.shoppingCartsCollection = afs.collection('shopping-carts',参考 =>ref.orderBy('dateCreated', 'asc'));this.shoppingCarts = this.shoppingCartsCollection.snapshotChanges().map(值=> {返回 values.map(value => {const 购物车 = value.payload.doc.data();const itemsArray = 购物车.items;购物车.observableItems = [];for (var i = 0, len = itemsArray.length; i < len; i++) {itemDocRef = itemsArray[i];value.observableItems.push(afs.doc('items/'+ itemDocRef.id).valueChanges());}返回购物车；});});

访问您的商品数据，就像任何其他可观察数据

<p *ngFor="let observableItem of shoppingCart.observableItems">{{(observableItem | async)?.displayName}}</p>

Let's say you have the following structure:

shopping-carts (collection)
 - shopping-cart 1(doc)
  -- dateCreated (field)
  -- items (collection)
 - shopping-cart 2(doc
  -- dateCreated
  -- items
 .
 .
 .

So, how would we go about getting the entire shopping-cart(doc) as an ShoppingCart object that we defined as

export interface ShoppingCart {
  items: ShoppingCartItem[]
  dateCreated: string
}

afs.doc('shopping-cart/id').valueChanges() only returns the dateCreated

afs.doc('shopping-cart/id').collection('items').valueChanges() returns the items.

Easy way to get all in one and create it as an object?

解决方案

Probably not the best solution, but couldn't find a better one yet.

this.shoppingCartsCollection = afs.collection<Servicio>('shopping-carts', 
        ref => ref.orderBy('dateCreated', 'asc'));

this.shoppingCarts = this.shoppingCartsCollection
    .snapshotChanges()
    .map(values => {
       return values.map(value => {

          const shopping-cart = value.payload.doc.data();
          const itemsArray = shopping-cart.items;
          shopping-cart.observableItems = [];

          for (var i = 0, len = itemsArray.length; i < len; i++) {
             itemDocRef = itemsArray[i];
             value.observableItems.push(afs.doc('items/'+ itemDocRef.id).valueChanges());
          }

          return shopping-cart;
       });
    });

access your items data, like any other observable

<div *ngFor="let shoppingCart of shoppingCarts | async">
   <p *ngFor="let observableItem of shoppingCart.observableItems">
      {{(observableItem | async)?.displayName}}
   </p> 
</div>

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