Use the constraints argument, as described here: 
http://web2py.com/books/default/chapter/29/07/forms-and-validators#smartgrid-signature

Anthony

On Sunday, September 24, 2017 at 10:14:41 AM UTC-4, LC LC wrote:
>
> Hello,
>
> def index():
>     records = 
> SQLFORM.smartgrid(dbvoy.voyageur,linked_tables=['voyageur','presence'],user_signature=True,maxtextlength=100,deletable=True,\
>                        editable=True,create=True,showbuttontext=False, 
> paginate=200,  buttons_placement = 'left',links_placement = 'left')
>
> I do not find how to add a condtion to replace dbvoy.voyageur by 
> dbvoy.voyageur.Birth < '2000-09-01'  , it does not work the rror shown 
> 'Query' object has no attribute '_tablename'
> Could you help me 
> thank you
>

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