#This uses 'links' to display my virtual field 'extradate'...
#Shows grid with all fields
grid=SQLFORM.grid(query=(db.prop.id < 10), links=[dict(header='ExtraDate', 
body=lambda row: row.extradate)] )

#This does the same thing but specifies fields...
grid=SQLFORM.grid(query=(db.prop.id < 10), links=[dict(header='ExtraDate', 
body=lambda row: row.extradate)],
    fields= (db.prop.id,db.prop.prop_ref)   )
###produces ticket ... KeyError: 'extradate'

How may we make it work?

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