def isValidFieldType?( type )
      @validFieldTypes ||= %w{ checkbox dblink date duration email file fkey float formula currency 
                  lookup multiuserid phone percent rating recordid text timeofday timestamp url userid icalendarbutton }
      @validFieldTypes.include?( type )
   end
def isValidFieldType?( type )
      @validFieldTypes ||= %w{ checkbox dblink date duration email file fkey float formula currency 
                  lookup multiuserid phone percent rating recordid text timeofday timestamp url userid icalendarbutton }
      @validFieldTypes.include?( type )
   end
Returns whether a given string represents a valid QuickBase field type.