[web2py] SQLFORM.grid(db.mydb, fields=['name', 'info'] generate error 'str

[Emilius Omeen]

hello

when use in controller default.py
def sql_form():
    sqlform=SQLFORM.grid(db.mydb, fields=['name','info'])
return dict(sqlform=sqlform)

generate ERROR ticket

<type 'exceptions.AttributeError'> 'str' object has no attribute 
'_tablename'
web2py™ (2, 0, 6, datetime.datetime(2012, 9, 2, 4, 44, 23), 'stable')  
Python Python 2.6.6: /usr/bin/python Traceback

1.
2.
3.
4.
5.
6.
7.
8.
9.
10.
11.
12.

Traceback (most recent call last):
  File "/home/www-data/web2py/gluon/restricted.py", line 209, in restricted
    exec ccode in environment
  File "/home/www-data/web2py/applications/s_users/controllers/default.py" 
<https://10.100.100.104/admin/default/edit/sip_users/controllers/default.py>, 
line 119, in <module>
  File "/home/www-data/web2py/gluon/globals.py", line 185, in <lambda>
    self._caller = lambda f: f()
  File "/home/www-data/web2py/applications/s_users/controllers/default.py" 
<https://10.100.100.104/admin/default/edit/sip_users/controllers/default.py>, 
line 64, in sql_form
    sqlform=SQLFORM.grid(db.sip_conf_db, fields=['name','info'])
  File "/home/www-data/web2py/gluon/sqlhtml.py", line 1701, in grid
    if field._tablename in tablenames]
AttributeError: 'str' object has no attribute '_tablename'

  Error snapshot  

<type 'exceptions.AttributeError'>('str' object has no attribute 
'_tablename') 
 Code listing 

1696.
1697.
1698.
1699.
1700.
1701.

1702.
1703.
1704.
1705.

            fields = reduce(lambda a,b:a+b,
                            [[field for field in table] for table in tables])
        if not field_id:
            field_id = tables[0]._id
        columns = [str(field) for field in fields \
                       if field._tablename in tablenames]


        if not str(field_id) in [str(f) for f in fields]:
            fields.append(field_id)
        table = field_id.table

__________________
but when used 
SQLFORM (db.mydb, fields=['name','info']) 

all working normal.

thanks


--