Question 120643 in Firebase Question posted in
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Firebase – How do I get the number of subcollectors in Firestore?

I’m making a whiteboard app using Flutter and Firestore.
This whiteboard app creates a room first, then creates pages, and then draws inside the page.

Firestore has the following configuration:

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I need to be able to get the number of subcollections in Firestore to get the number of pages.

How do I get the number of these subcollections(pages)?

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Answers


  1. 0

    There is no function that can return the number of sub-collections that exist within a document. If you need such a count, you need to create this mechanism yourself. But it’s pretty simple, you can create a document in which you can increment/decrement a numeric value, each time a new sub-collection is added or deleted from the document.

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  2. 0

    You can’t get all collection from one doc in dart.

    Retrieving a list of collections is not possible with the mobile/web client libraries. You should only look up collection names as part of administrative tasks in trusted server environments. If you find that you need this capability in the mobile/web client libraries, consider restructuring your data so that subcollection names are predictable.

    Here is the document link.

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