i think you want to fetch data of particular row.......Please use the 
following code for the same

def myfunctionit_detail():
 
links = [lambda row: 
A('Upload',_href=URL("default","myfunction",args=[row.id] ))]
 query =  ((db.tracker.id>=0 )  )
grid = SQLFORM.grid(query=query, links=links,maxtextlength=250, 
 sortable=True,csv=False ,fields=fields, paginate=40 , 
sorter_icons=(XML('↑'), XML('↓')) , 
editable=auth.has_membership('editor_group'), 
deletable=auth.has_membership('delete_group'), 
create=auth.has_membership('create'), showbuttontext=False)

return dict(form =grid) 

On Monday, August 25, 2014 12:30:47 PM UTC+5:30, Dmitry Ermolaev wrote:
>
>         SQLFORM.grid(db.pets,
>             field_id = db.pets.url,
>
>

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