Here is the complete signature of grid method from source.... there is
really no truncate param.
def grid(query,
fields=None,
field_id=None,
left=None,
headers={},
columns=None,
orderby=None,
searchable=True,
sortable=True,
paginate=20,
deletable=True,
editable=True,
details=True,
selectable=None,
create=True,
csv=True,
links=None,
upload = '<default>',
args=[],
user_signature = True,
maxtextlengths={},
maxtextlength=20,
onvalidation=None,
oncreate=None,
onupdate=None,
ondelete=None,
sorter_icons=('[^]','[v]'),
ui = 'web2py',
showbuttontext=True,
_class="web2py_grid",
formname='web2py_grid',
):
