Help you out for typos

lib/dao-factory.js

@@ -49,6 +49,8 @@ module.exports = (function() {
 
     this.primaryKeys = {};
     Utils._.each(this.attributes, function(dataTypeString, attributeName) {
+      // If you don't specify a valid data type lets help you debug it
+      if( dataTypeString === undefined ) throw new Error("Unrecognized data type for field " + attributeName );  
       if((attributeName != 'id') && (dataTypeString.indexOf('PRIMARY KEY') !== -1)) {
         self.primaryKeys[attributeName] = dataTypeString
       }