I am making a collection group query and getting the data by .get method , is there any way to get the document id which consists that collection ?

Collection:Users ------ Doccument:user1 -> Collection:Posts -> Document:post 1,2,3.. ------- Doccument:user2 -> Collection: Posts -> Document:post a,b,c..

So while making the query i am getting post 1,2,3.. & a,b,c..

But how to get the document document id from where a,b,c or 1,2,3 are comming ?

In this case it i want to get user 1 & user 2 as result !

Just let me know if it is possible first !

• Android : Kotlin

CodePudding user response：

For a document of any of the Posts subcollections you need to:

• Firstly, get the CollectionReference of the Document's parent Collection, with the getParent() method of the DocumentReference
• Secondly, on this parent CollectionReference, call the getParent() method which returns the DocumentReference of the Collection's parent Document.
• Finally, use the getId() method on this DocumentReference. You're done.