[web2py] How to create a list from a select query

[Amirshk]

I am trying to figure out how to convert a Set or Rows into a list and not 
a table.
This is what I tried so far:

`list_tags` was supposed to convert the list, but I can't figure this one 
out. 

        def list_tags(id):
            tags = db(db.credit_transactions_tags.transaction_ref == 
id).select()
            if tags:
                html = '<ul>'
                for tag in tags:
                    html += '<li>'+tag.name+'</li>'
                html += '</ul>'
                return html
            else:
                return ''

        links =  [{'header':'Tags', 'body': lambda row: list_tags(row.id) 
}]        
        records = 
SQLFORM.grid(db.credit_transactions.account_ref==account_id, fields=fields, 
links=links, maxtextlength=50, args=[account_id])


Thanks in advance.

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