bind this to function and don't use additional self variable

lib/dao-factory.js

@@ -270,17 +270,17 @@ module.exports = (function() {
   }
 
   var findAutoIncrementField = function() {
-    var self   = this
-      , fields = this.QueryGenerator.findAutoIncrementField(this)
+    var fields = this.QueryGenerator.findAutoIncrementField(this)
 
     this.autoIncrementField = null
 
     fields.forEach(function(field) {
-      if(self.autoIncrementField)
+      if (this.autoIncrementField) {
         throw new Error('Invalid DAO definition. Only one autoincrement field allowed.')
-      else
-        self.autoIncrementField = field
-    })
+      } else {
+        this.autoIncrementField = field
+      }
+    }.bind(this))
   }
 
   Utils._.extend(DAOFactory.prototype, require("./associations/mixin"))