I am missing something very simple here, but can't unstuck myself: 

This is what I want to have in the Field constructor (though it's obviously 
incorrect):

Field('link', default=lambda link, row: URL('podcast', 'episode/' + row.id, 
scheme=True, host=True))

I simply want one field to be determined by the other, in this case the 
constructed link field should depend on the id field. 

How do I accomplish this correctly? 

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