minor refactoring

lib/model.js

@@ -49,7 +49,8 @@ module.exports = (function() {
       return this.QueryInterface.insert(this, this.__definition.tableName, this.values)
     } else {
       var identifier = this.__options.hasPrimaryKeys ? this.primaryKeyValues : this.id
-        , query = this.QueryInterface.update(this, this.__definition.tableName, this.values, identifier)
+        , tableName  = this.__definition.tableName
+        , query      = this.QueryInterface.update(this, tableName, this.values, identifier)
 
       return query
     }