How to observe fetchCount #375

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opened 2025-12-29 18:26:14 +01:00 by adam · 2 comments

adam commented 2025-12-29 18:26:14 +01:00

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Originally created by @Feuerwerk on GitHub (Sep 23, 2021).

Hi,

Is there a way in CoreStore to observe the number of records in a table the same way one can use List-/ObjectPublisher or Combine to observe the records itself? In my case i don't want to use the ListPublisher since i don't want to fetch all records when they change and count them. Or does ListSnapshot.count don't fetch all records?

Originally created by @Feuerwerk on GitHub (Sep 23, 2021). Hi, Is there a way in CoreStore to observe the number of records in a table the same way one can use List-/ObjectPublisher or Combine to observe the records itself? In my case i don't want to use the ListPublisher since i don't want to fetch all records when they change and count them. Or does ListSnapshot.count don't fetch all records?

adam added the question label 2025-12-29 18:26:14 +01:00

adam closed this issue 2025-12-29 18:26:14 +01:00

adam commented 2025-12-29 18:26:14 +01:00

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@JohnEstropia commented on GitHub (Sep 23, 2021):

ListSnapshot.count does rely on fetched arrays in order to count them. My suggestion would be to cache this count to one of your entities' property and observe that value instead.

@JohnEstropia commented on GitHub (Sep 23, 2021): ListSnapshot.count does rely on fetched arrays in order to count them. My suggestion would be to cache this count to one of your entities' property and observe that value instead.

adam commented 2025-12-29 18:26:14 +01:00

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@Feuerwerk commented on GitHub (Sep 24, 2021):

Thanks for your help. :-)

@Feuerwerk commented on GitHub (Sep 24, 2021): Thanks for your help. :-)

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Reference: starred/CoreStore-JohnEstropia#375