问题描述
子存储区的任何更改是否触发了firestore的onSnapshot方法?
Is the method onSnapshot of firestore triggered by any changes in subcollections?
之间有什么区别db.firestore.collection('x').onSnapshot
What is the difference between db.firestore.collection('x'). onSnapshot
和db.firestore.collection('x').doc('y').collection('z').onSnapshot
And db.firestore.collection('x').doc('y').collection('z'). onSnapshot
它们相等吗??
推荐答案
对在文档下组织的子集合的更改不算作对文档本身的更改.他们不会在该文档上触发快照事件.
A change to a subcollection organized under a document do not count as changes to the document itself. They will not trigger a snapshot event on that document.
侦听子集合与侦听顶级集合没有什么不同.在这两种情况下，侦听器都只会通过对该集合或子集合中的文档进行更改来触发.
Listening to a subcollection is not any different than listening to a top-level collection. In both cases, the listener will only be triggered by changes to documents within that collection or subcollection.
这篇关于Firestore onSnapshot->它适用于子集合吗?的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持！