- useful error message for bad data type (fixes #551)

lib/sequelize.js

@@ -151,6 +151,12 @@ module.exports = (function() {
     options = options || {}
     options = options || {}
     var globalOptions = this.options
     var globalOptions = this.options
 
 
+    for (var name in attributes){
+      if (attributes[name].type === undefined){
+        throw new Error(daoName + '.' + name + ' has been set it an undefined data type.');
+      }
+    }
+
     if (globalOptions.define) {
     if (globalOptions.define) {
       options = Utils._.extend({}, globalOptions.define, options)
       options = Utils._.extend({}, globalOptions.define, options)
       Utils._(['classMethods', 'instanceMethods']).each(function(key) {
       Utils._(['classMethods', 'instanceMethods']).each(function(key) {