Thank you, Tim. My previous confusion comes from which field should be 
format as IS_IN_SET or IS_IN_DB once 2 tables have many-to-many links or 
single-to-many links, how to represent related field in controller and 
view. Previously listed web posts really take confusions to a beginner. So 
I will post my experience, a simple case to explain that.

On Wednesday, January 22, 2014 4:02:00 AM UTC+8, Tim Richardson wrote:
>
> to get drop downs you need to set a validator in the field definition. 
> IS_IN_SET is one validator which causes SQLFORM to automatically make a 
> dropdown.  so you don't do anything in SQLFORM. Rather you set up your data 
> model when defining tables. 

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