how to add sub collection to a document in firestore?

Question

there is no documentation about how add sub collection in a document in firestore, how to add a sub collection by using a web app? even tried like this but didn't worked. how can i add a sub collection in apps by using code? is there any way to do it or it will be better to use firebase real time database? if it so, please let me know how to do it in firebase as welli want to add like this i did this but iam getting an error like this the error says this

The solution goes: Get the interested document (doc) and then: doc.ref.collection('Collection_Name').add('Object_to_be_added') It is advisable to include a then/catch after the promise. — Santiago M. Quintero, May 28 '18 at 19:22
OP can you please put code blocks into your question, and not images of code? — dwjohnston, Apr 12 '19 at 01:56

Jason Berryman · Accepted Answer · 2018-02-20T17:58:50.027

84

Your code should work if you change .set to .add. Cloud Firestore will then issue a new ID for that document. If you want to specify the document ID, then you'll need to do this...

Set a book with a given ID

db.collection('users').doc(this.username).collection('booksList').doc(myBookId).set({
  password: this.password,
  name: this.name,
  rollno: this.rollno
})

This page details how to Add data to Cloud Firestore

Add a book

db.collection('users').doc(this.username).collection('booksList').add({
  password: this.password,
  name: this.name,
  rollno: this.rollno
})

edited Feb 20 '18 at 17:58

answered Feb 19 '18 at 20:23

Jason Berryman

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I tried add method also, Even tried your code, But didnt worked. It is showing an error – user8167002 Feb 20 '18 at 02:52
1

You will need to paste the error here. You have provided so little code in your screenshot, it is impossible to be sure what the issue is. The normal practice is to paste code snippets into Stack Overflow, not simply provide screenshots. – Jason Berryman Feb 20 '18 at 07:25
i have edited the question, i have added the picture wihch shows the error, please check it once sir. – user8167002 Feb 20 '18 at 17:45
thank you, i did a mistake. i used set instead of add – user8167002 Feb 20 '18 at 17:57
Yes. I just updated my answer. Your error was till showing you using `set`, not `add`. I'm glad that you have it sorted now – Jason Berryman Feb 20 '18 at 17:59
If this is working now, please mark this post as answered. There is a tick on the left – Jason Berryman Feb 20 '18 at 18:03

how to add sub collection to a document in firestore?

1 Answers1

Set a book with a given ID

Add a book

Linked

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