Adding documents with same ID to Firestore at the same time

[Alvaro Gonzalez Rico]

Hello! I want to add 2 documents with the same ID to Firestore when doing the following: 

I want the bold one to have the same document ID as the non-bold one, since both are adding the same info to different places in Firestore. How could I do this? Thanks

void _sendPost() async {

 FirebaseFirestore.instance.collection('post').doc(docX).collection('posts').add({})

 FirebaseFirestore.instance.collection('users').doc(user.uid).collection('userPosts').add({})

}

[Suzuki Tomohiro]

What’s the problem in the code?

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[Alvaro Gonzalez Rico]

Oh there is no problem in the code. It is just that right now, the bold and non-bold give me different document IDs. I want to see if it is possible for them to have the same ID. Preferably if the bold can have the same doc ID as the non-bold.

[Suzuki Tomohiro]

It seems that you want to specify document ID when creating a document. Use "set" rather than "add".

> Set the data of a document within a collection, explicitly specifying a document identifier.

https://firebase.google.com/docs/firestore/manage-data/add-data

https://pub.dev/documentation/cloud_firestore/latest/cloud_firestore/DocumentReference/set.html

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[Alvaro Gonzalez Rico]

Thanks! I was able to find the solution.