hi, 

The code that I have is this : 

'class_ids': fields.many2many('class.class', 'discipline_class_rel', 'discipline_id', 'class_id', 'Class',),

 

'student_id': fields.related('class_ids','student', type="many2many", relation="res.partner", string="Student", store=True)

Is it possible to the first parameter ('class_ids') of a fields.related() to be a fields.many2many ? 

For some reason I get this error:

cr.execute('ALTER TABLE "%s" ADD COLUMN "%s" %s' % (self._table, k, get_pg_type(f)[1]))
TypeError: 'NoneType' object is unsubscriptable

Is it possible to do this ? 

Thanks