Question 273680 in Flutter Question posted in
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not knowing how to get the collection id from firestore(flutter)

I want to get the pregnancyInfo document ID which is a subcollection from users collection .

why I want to get the document ID? because I want to access the weight subcollection

here is a picture of the firestore

As you can see from the code below, what am doing is copying and pasting the doc id but each user have a different pregnancy info document ID. So is there a way to retrieve the Document id and store it in a variable?

 Future<Widget> getWeight(String weightDate, String weight) async {
String userUid = getUserId();
print('weight date is $weightDate');
QuerySnapshot result = await FirebaseFirestore.instance
    .collection('users')
    .doc(userUid)
    .collection('pregnancyInfo')
    .doc("HMEBTKrnOYnmxPmBMHuV")
    .collection('weight')
    .get();
Tags:

2

Answers


  1. 0

    If I correctly understand your question you need to execute a query on the pregnancyInfo sub-collection under the userUid document.

    You will get one or more documents corresponding to one or more "babies".

    QuerySnapshot result = await FirebaseFirestore.instance
    .collection('users')
    .doc(userUid)
    .collection('pregnancyInfo')
    .get();
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  2. 0

    If you want to query the pregnancy info across all users, you can use a collection group query to read from all pregnancyInfo collections at once.

    Similarly, you can use a collection group query on weight to read from all weight collections in one go.

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