I wanted to implement the validations of certain columns in the ag-grid table in angular. My approach towards it is,

1. I will maintain a form group and the children's of form groups are form arrays. The controls in the form array are pushed from a directive that sits on top of ag-grid.
2. I use a custom cell renderer to display a border around the cell to show case an error entry by the user.
3. So to get the correct control from form array inside the cell renderer component, I need to map a unique Id of row with the form array index to get the correct control.
4. I tried using RowNodeId but that Id currently is coming up from a backend system. When I copy a row, then that row doesn't have any Id, that creates a problem for me to fetch the correct control from form array.
5. While debugging I have found RowNode has "_objectId" associated with it, which seems unique and this will be available for copied rows also and I see it doesnt change with grouping/sorting/filtering.

Could anyone suggest me how should I decide my Id for the above mentioned scenario. I really appreciate for your help in advance.

PS: I am using v22 of ag-grid for some reason.