merged from rebased async-validations

lib/dao.js

 var Utils        = require("./utils")
   , Mixin        = require("./associations/mixin")
-  , Validator = require("validator")
   , DataTypes    = require("./data-types")
+  , QueryChainer = require("./query-chainer")
+  , Validator    = require("validator")
+
 
 module.exports = (function() {
   var DAO = function(values, options, isNewRecord) {
@@ -256,14 +258,90 @@ module.exports = (function() {
             }
           }
 
+    return new Utils.CustomEventEmitter(function(emitter) {
+
+      var chainer = new QueryChainer;
+
+      // for each field and value
+      Utils._.each(self.values, function(value, field) {
+
+        // if field has validators
+        if (self.validators.hasOwnProperty(field)) {
+          // for each validator
+          Utils._.each(self.validators[field], function(details, validatorType) {
+
+            //var is_custom_fn = false  // if true then it's a custom validation method
+            var fn_method = null      // the validation function to call
+            var fn_args = []          // extra arguments to pass to validation function
+            var fn_msg = ""           // the error message to return if validation fails
+
+            // is it a custom validator function?
+            if (Utils._.isFunction(details)) {
+              fn_method = function (next) {
+                 //console.log(field, arguments);
+                 details.apply(self, [value, next])
+              }
+            }
+            // is it a validator module function?
+            else {
+              // extra args
+              if (Utils._.isArray(details)) {
+                fn_args = Array.prototype.slice.call(details, 0);
+              } else {
+                fn_args = details.hasOwnProperty("args") ? details.args : []
+              }
+              if (!Utils._.isArray(fn_args))
+                fn_args = [fn_args]
+              // error msg
+              fn_msg = details.hasOwnProperty("msg") ? details.msg : false
+              // check method exists
+              var v = Validator.check(value, fn_msg)
+              if (!Utils._.isFunction(v[validatorType]))
+                throw new Error("Invalid validator function: " + validatorType)
+
+              fn_method = function (next) {
+                var args = Array.prototype.slice.call(arguments, 1);
+                try {
+                  v[validatorType].apply(v, args);
+                  next();
+                } catch (err) {
+                  next(err.message);
+                }
+              }
+            }
+
+            chainer.add(new Utils.CustomEventEmitter(function(emitter) {
+                var next = function (err) {
+                  if (err) {
+                    var error = {};
+                    error[field] = err;
+                    emitter.emit('error', error);
+                  } else {
+                    emitter.emit('success')
+                  }
+                }
+                fn_args.unshift(next);
+                fn_method.apply(self, fn_args)
+            }).run());
+
           }) // for each validator for this field
         } // if field has validator set
       }) // for each field
 
-    return (Utils._.isEmpty(failures) ? null : failures)
+      chainer.run()
+        .error(function (err) {
+          var errors = {};
+          Utils._.each(err, function (value) {
+            Utils._.extend(errors, value);
+          });
+          emitter.emit('error', errors);
+        })
+        .success(function () {
+            emitter.emit('success');
+        })
+    }).run();
   }
 
-
   DAO.prototype.updateAttributes = function(updates, fields) {
     this.setAttributes(updates)
     return this.save(fields)