The following show_if condition gives me an "Not Implemented Error":
auth_table_user.position.show_if = 
auth_table_user.employee_type.belongs(('employee', 'external'))

I fixed it for me, with the following change in sqlhtml.py 
    if cond.op.__name__ == 'BELONGS' and 
isinstance(cond.second,(list,tuple)):
to
    if cond.op.__name__ == 'BELONGS' and 
isinstance(cond.second,(set,list,tuple)):

Is this a bug, or is there a different notation for belongs?
I tried 
belongs('employee', 'external')
belongs(('employee', 'external'))
belongs(['employee', 'external'])
cond.second is always a Set.

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