[web2py] Is using composite key with SQLFORM.grid allowed ?

[Mandar Vaze]

I've an associate table for many-to-many relationship with composite 
key defined as follows :

db.define_table('user_skill', 
    Field('user', db.user), 
    Field('skill', db.skill),
    primarykey=['user', 'skill'])

When I use SQLFORM.grid for the above table, I get the following error :

  File "/home/mandar/web2py/gluon/sqlhtml.py", line 1596, in grid
    field_id = tables[0]._id
  File "/home/mandar/web2py/gluon/dal.py", line 7357, in __getattr__
    return self[key]
  File "/home/mandar/web2py/gluon/dal.py", line 7297, in __getitem__
    return dict.__getitem__(self, str(key))
KeyError: '_id'

SQLFORM.grid seems to be looking explicitly for 'id' field hence the error.

Is there a workaround ?

Thanks,
-Mandar

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