I suppose modified_on field is readonly, so it is not post back along form submitting, but you can inject it using hidden attribute, that could be passed to the grid through editargs. I would do the following: - detect edit action by checking request.args(-3)=='edit' - retrieve modified_on of db.tbl[request.args[-1]] - pass it to the grid - grid(..., editargs=dict(hidden=dict(modified_on=...))) - get it back by request.vars.modified_on in the onvalidation callback
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