Dont validate fields that are not saved. Closes #1449

lib/dao.js

@@ -305,9 +305,9 @@ module.exports = (function() {
     }
 
     return new Utils.CustomEventEmitter(function(emitter) {
-      self.hookValidate().error(function (err) {
-        return emitter.emit('error', err)
-      }).success(function() {
+      self.hookValidate({
+        skip: _.difference(Object.keys(self.rawAttributes), options.fields)
+      }).proxy(emitter, { events: ['error'] }).success(function() {
         options.fields.forEach(function(field) {
           if (self.dataValues[field] !== undefined) {
             values[field] = self.dataValues[field]

test/dao.test.js

@@ -780,6 +780,15 @@ describe(Support.getTestDialectTeaser("DAO"), function () {
       })
     })
 
+    it('only validates fields in passed array', function (done) {
+      this.User.build({
+        validateTest: 'cake', // invalid, but not saved
+        validateCustom: '1'
+      }).save(['validateCustom']).success(function () {
+        done()
+      })
+    })
+
     it("stores an entry in the database", function(done) {
       var username = 'user'
         , User     = this.User