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[Flutter/dart] Documents that should be in the firestore cannot be extracted


Overview


I want to get only the documents that meet the conditions from the documents saved in the firestore. I made a query using where (), but I can't get the document that should be there (I confirm that it actually exists on the console).


Cause


There was a document that contains only collection. If there is such a document, it seems that it will not be queried, including the elements after that.


collection A

- document A1 ←document contains only collection

-collection B

-collection C

- document C1 ←I want to extract these documents by where()

- document C2

・・・



Solution


I could only think of putting a tentative value in a document that contained only a collection so that it could be seen.

Well, I was able to extract with where().


collection A

- document A1

   'dummy': 0 ←tentative value

-collection B

-collection C

- document C1 ←I want to extract these documents by where()

- document C2

・・・

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