Can I combine subcollection data of firestore? [duplicate] - firebase

This question already has answers here:
Can I retrieve documents of same subcollection in different collections with the same name, using Firestore?
(2 answers)
Firestore - How to retrieve all subcollections of a collection
(1 answer)
Query through all documents in a collection, and through all subcollections in firestore
(1 answer)
Closed last month.
I have diary collection in firestore.
And in diary collection, I have likes sub-collection.
Sometimes I need data all likes regardless of diary.
In that case, Can I combine all likes sub-collection data ?
If it is not possible, so should I create one more collection of likes?

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How to get all sub-Collection from firestore in react native? [duplicate]

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How to list subcollections in a Cloud Firestore document
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Fetching all collections in Firestore
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Closed last month.
I want to get list of all sub-Collection from firestore:
Chat (col):
0NzkNYBCqrVsUfORWksdc8bMj7J2 (doc):
Here, I want to get list of all sub collections
I can access sub-Collection individually but i cant get list of collection.

Reading in Firestore is by the amount returned or read? [duplicate]

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Does a collection('name').get() counts as 1 read, or as many reads as documents inside that collection?
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Firestore read count when read documents size
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How many reads in Firestore am I performing?
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Closed 11 months ago.
A "read" in Firestore is counted as?
Let's say I have a collection called "users" containing 10000 documents and when I give a getDocuments with a "where" it returns only one (1) document, in which case the reading will be 1 or 10000?

Retrieve the list of Sub Collection from Firestore in Flutter [duplicate]

This question already has answers here:
How to list subcollections in a Cloud Firestore document
(4 answers)
How to list subcollection on firestore? [duplicate]
(1 answer)
Closed 2 years ago.
I have a list of sub-collections in flutter I need the names of the subcollections alone how can I get that?
This is the structure of my firestore.
I need the list like:
[name1, name2,.....] to display in a listview in a flutter.
Thanks in advance.
Check this out:
https://stackoverflow.com/a/59850965/1272655
There currently is no way to get a list of collections through the client sdk.

Firestore Documents Template [duplicate]

This question already has answers here:
Firebase Firestore: Is there a way to enforce required fields for all documents in a collection?
(3 answers)
Closed 2 years ago.
I'm creating a Firestore Database that has a "devices" collection then each device has its own document. I already have a device with various fields.
Is there any way I can create a template where the document fields remains the same for all documents and I can just fill in the values upon adding a new device from the Firebase console?
Documents in Firestore only contain exactly what you put in there. There are no "default" or "understood" fields. If you want a document field to contain some value, you will have to write it into each document.

Get Only documents names in Firestore [duplicate]

This question already has answers here:
How to get a list of document IDs in a collection Cloud Firestore?
(4 answers)
Closed 5 years ago.
Is it possible to get only documents name as a String array without retrieving any collections? I couldn't find any documentation about it.
There is no API to retrieve only the document names in the SDKs. But the REST API has a list call that seems to do precisely that.

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