Firestore获取根集合的所有文档和子集合 [英] Firestore get all docs and subcollections of root collection

问题描述

说我有这种结构

    A (collection): { 
       a (doc): {
           name:'Tim',
           B (collection):{
               b (doc): {
                      color:'blue'
               }
             }
          }
    }

其中A和B是集合，而a和b是文档.
是否有一种方法可以通过一个查询获取根文档中包含的所有内容?
如果我这样查询

where A and B are collections while a and b are documents.
Is there a way to get everything contained in a root document with one query?
If I query like this

db.collection("A").doc("a").get()

我刚得到name:'Tim'字段.我想要的是也获取所有B的文件.
我基本上希望我的查询返回

I just gets name:'Tim' field. What I want is to also get all B's documents.
I basically wish my query returns

         {
           user:'Tim',
           B (collection):{
               b (doc): {
                      color:'blue'
               }
             }
          }

是可能还是真的需要针对每个集合进行多个查询:/?

Is it possibly or do I really need to make multiple queries one for each collection :/ ?

说我有一个非常深的嵌套的表示用户个人资料的集合树，由于每次加载用户个人资料时，我都有一个读取请求的乘数，因此我的成本会像地狱般上升.1 x N其中N是我的树的深度:/.

Say I have a really deep nested tree of collections representing the user profile, my costs will raise like hell since each time I load a user profile I have a multiplier of read requests 1 x N where N is the depth of my tree :/.

推荐答案

众所周知，默认情况下，Cloud Firestore中的查询是浅层的.虽然将来Google会考虑使用这种查询，但不支持这种查询.

As we know querying in Cloud Firestore is shallow by default. This type of query isn't supported, although it is something Google may consider in the future.

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