refactoring data_structures/column.rb to fix a potential problem with the :field attribute. @field was being set from @table and self.name, but self.name isn't a  reliable source for the field name. now, @field comes from @table and self.field_name, where self.field_name is a derived attribute.
refactoring data_structures/column.rb to fix a potential problem with the :field attribute. @field was being set from @table and self.name, but self.name isn't a 
reliable source for the field name. now, @field comes from @table and self.field_name, where self.field_name is a derived attribute.

PiRSquared17/activescaffold,PiRSquared17/activescaffold,PiRSquared17/activescaffold