On Nov 14, 2007 4:08 PM, Rodrigo Moraes wrote: > 'native_col' means "the native column that maps to a foreign record". ps: on the other side, in the MARKET model you would use the opposite: 'foreign_key'. they both map to the same column of the same model (market_id), but while it is a 'native_col' in one model, it is a 'foreign_col' in the other.