move error on non-function model validation function from validate() to DAO factory

Also add a test for it

lib/dao-factory.js

@@ -21,6 +21,12 @@ module.exports = (function() {
       schemaDelimiter: ''
     }, options || {})
 
+    // error check options
+    Utils._.each(options.validate, function(validator, validatorType) {
+      if (!Utils._.isFunction(validator))
+        throw new Error("Members of the validate option must be functions. Model: " + name + ", error with validate member " + validatorType)
+    })
+
     this.name = name
     if (!this.options.tableName) {
       this.tableName = this.options.freezeTableName ? name : Utils.pluralize(name)

lib/dao.js

@@ -271,8 +271,6 @@ module.exports = (function() {
 
     // for each model validator for this DAO
     Utils._.each(self.__options.validate, function(validator, validatorType) {
-      if (!Utils._.isFunction(validator))
-        throw new Error("Invalid model validator function: " + validatorType)
       try {
         validator.apply(self)
       } catch (err) {

spec/dao-factory.spec.js

@@ -70,6 +70,20 @@ describe(Helpers.getTestDialectTeaser("DAOFactory"), function() {
         })
       }.bind(this), 'Invalid DAO definition. Only one autoincrement field allowed.')
     })
+
+    it('throws an error if a custom model-wide validation is not a function', function() {
+      Helpers.assertException(function() {
+        this.sequelize.define('Foo', {
+          field: {
+            type: Sequelize.INTEGER
+          }
+        }, {
+          validate: {
+            notFunction: 33
+          }
+        })
+      }.bind(this), 'Members of the validate option must be functions. Model: Foo, error with validate member notFunction')
+    })
   })
 
   describe('build', function() {