Group By on rowExpanded fetching data from API creating null rows

Requirements –

1. Manage pagination at each group level.
2. Load group on demand when user clicks on row expand. https://i.pinimg.com/originals/81/ad/be/81adbef7d4758b011ad43b2315164395.png https://i.pinimg.com/originals/31/92/52/31925269ceafbcaecdef762c3ee2ef2d.png

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The ui grid displays columns : Severity, Name, Status, caseID, AssetID, AssetName, SiteName ....soon total 12 columns. Issue –

1. Apply Grouping on Severity, Status, AssetId, caseId columns.

2. By default grid displays Severity group as level zero. https://i.pinimg.com/564x/a5/aa/f3/a5aaf37583f059702615cfbb62dca7ff.jpg

3. When we expand Severity “One” entity, application request API to fetch top 100 distinct status where severity is equal to one. https://i.pinimg.com/564x/fa/1d/23/fa1d2324b2af45b4195426a99a5310cd.jpg

4. On expand of Closed status entity the application request API to fetch top 100 distinct AssetId list where status is equal to closed and severity id equal to one https://i.pinimg.com/564x/b8/8b/23/b88b23ed00029f5a4785a68eae083c3a.jpg

5. At this level we can observe some empty rows i.e. null value rows are created. The application refined dataset correctly.

6. Issue Root Cause Guess – as the source data set which is injected to ui-grid is refined correctly based on the grouping conditions & API response the UI-Grid visibleRowCatche is not updated when compared with bonded dataset