i think you can figure it out by yourself where the 'edit' is passed in 
request.args. the minus part of list is tell that you must sort it backward 
(from right), so if it : request.args[-3] == 'edit'
the edit must be the 3rd args from the right part 

for your case e.g.
App/default/product/edit/(record id)?(hmac)
so the request.args[-2] == 'edit'

for the suggestion i gave to you above is taken from my code that is using 
sqlform.smartgrid and in your case you are using sqlform.grid, so please 
try request.args[-2] == 'edit'.

best regards,
stifan

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