diff --git a/lib/Lib/Core/Model.class.js b/lib/Lib/Core/Model.class.js
index c80c85d0..af272cd9 100644
--- a/lib/Lib/Core/Model.class.js
+++ b/lib/Lib/Core/Model.class.js
@@ -267,7 +267,7 @@ var Model = module.exports = Class(function(){
          * @return {[type]} [description]
          */
         where: function(where){
-            if (isString(where) && where) {
+            if (where && isString(where)) {
                 where = {
                     "_string": where
                 }
@@ -319,7 +319,7 @@ var Model = module.exports = Class(function(){
             return this;
         },
         /**
-         * 生成查询SQL 可用于子查询
+         * 生成查询SQL 可用于子查询，返回一个promise
          * @param  {[type]} options [description]
          * @return {[type]}         [description]
          */
@@ -336,10 +336,11 @@ var Model = module.exports = Class(function(){
          */
         parseOptions: function(options, extraOptions){
             var self = this;
+            var promise = null;
+
             options = extend(this.options, this.parseWhereOptions(options), extraOptions);
             // 查询过后清空sql表达式组装 避免影响下次查询
             this.options = {};
-            var promise = null;
             //获取数据表下的字段信息
             if (options.table) {
                 promise = this.getTableFields(options.table);
@@ -383,7 +384,7 @@ var Model = module.exports = Class(function(){
                         };
                         return item;
                     }).join(',');
-                };  
+                };
                 options = self._optionsFilter(options, fields);
                 return options;
             });
@@ -511,7 +512,7 @@ var Model = module.exports = Class(function(){
             })
         },
         /**
-         * 插入多条数据
+         * 插入多条数据,返回最后一个插入的ID
          * @param {[type]} data    [description]
          * @param {[type]} options [description]
          * @param {[type]} replace [description]
@@ -687,10 +688,10 @@ var Model = module.exports = Class(function(){
             return this.parseOptions(options, {
                 limit: 1
             }).then(function(options){
-                return self.db.select(options).then(function(data){
-                    var result = data ? data[0] : [];
-                    return self._afterFind(result, options);
-                })
+                return self.db.select(options);
+            }).then(function(data){
+                var result = data ? data[0] : [];
+                return self._afterFind(result, options);
             }).then(function(result){
                 if (result === false) {
                     return getPromise("_afterFind return false", true);
@@ -698,6 +699,12 @@ var Model = module.exports = Class(function(){
                 return result;
             })
         },
+        /**
+         * select后置操作
+         * @param  {[type]} result  [description]
+         * @param  {[type]} options [description]
+         * @return {[type]}         [description]
+         */
         _afterSelect: function(result, options){
             return result;
         },