docs(firestore): document Firestore query and populateCell transforms - #1383
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Clarify that Firestore UI has no client-side map/filter/sort, and show query-side ordering plus limit(toLast:) for chat-style feeds. Fixes #491
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This pull request updates the FirebaseFirestoreUI/README.md documentation to add a section on transforming and ordering data, advising developers to use query-side filtering and ordering rather than client-side transforms. The review feedback suggests improving consistency by using "Firebase Database UI" instead of "Realtime Database UI" and adding technical details about the O(N^2) complexity of the diffing algorithm in FUIBatchedArray to better justify keeping queries bounded.
russellwheatley
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Co-authored-by: gemini-code-assist[bot] <176961590+gemini-code-assist[bot]@users.noreply.github.com>
russellwheatley
marked this pull request as ready for review
August 3, 2026 09:59
demolaf
approved these changes
Aug 3, 2026
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Summary
populateCell, since there is no Firestore equivalent of Database UI'sFUISortedArray.limit(toLast:)feeds.