Add support to use adapter constructor for initialization

lib/datasource.js

@@ -170,7 +170,7 @@ DataSource.prototype.setup = function(name, settings) {
     }
 
     if (adapter) {
-        adapter.initialize(this, function () {
+        var postInit = function postInit() {
 
             // we have an adaper now?
             if (!this.adapter) {
@@ -192,7 +192,16 @@ DataSource.prototype.setup = function(name, settings) {
             this.connected = true;
             this.emit('connected');
 
-        }.bind(this));
+        }.bind(this);
+
+        if ('function' === typeof adapter.initialize) {
+            // Call the async initialize method
+            adapter.initialize(this, postInit);
+        } else if('function' === typeof adapter) {
+            // Use the adapter constructor directly
+            this.adapter = new adapter(this.settings);
+            postInit();
+        }
     }
 
     schema.connect = function(cb) {
@@ -277,7 +286,7 @@ DataSource.prototype.define = function defineClass(className, properties, settin
     // add data access objects
     this.mixin(NewClass);
 
-    if(this.adapter) {
+    if(this.adapter && this.adapter.define) {
         // pass control to adapter
         this.adapter.define({
             model: NewClass,
@@ -344,7 +353,7 @@ DataSource.prototype.attach = function (ModelCtor) {
 
   this.mixin(ModelCtor);
 
-  if(this.adapter) {
+  if(this.adapter && this.adapter.define) {
     // pass control to adapter
     this.adapter.define({
         model: ModelCtor,
@@ -1160,7 +1169,7 @@ DataSource.prototype.copyModel = function copyModel(Master) {
             settings: md.settings
         };
 
-        if (!schema.isTransaction) {
+        if ((!schema.isTransaction) && schema.adapter && schema.adapter.define) {
             schema.adapter.define({
                 model:      Slave,
                 properties: md.properties,