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:

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)?

CodePudding user response：

There is no function that can return the number of sub-collections that exist within a document. If 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.

CodePudding user response：

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.