抽出新建类的函数，可以同时返回多个model

core/model/Model.coffee

@@ -9,6 +9,15 @@ module.exports = class Model
   @create : ->
     throw 'this function must be overrided'
 
+  @createModels : (docs)->
+    throw 'docs must be array' if not _.isArray docs
+    results = []
+    if docs.length is 1
+      for doc in docs
+        results.push @create doc
+    else
+      results = @create docs[0]
+    results
   @table : ->
     "#{@name.toLowerCase()}s"
 
@@ -27,12 +36,7 @@ module.exports = class Model
     @collection().insert data, {w:1}, (err, docs) =>
       throw err if err
       if callback
-        results = []
-        if docs.length is 1
-          for doc in doc
-            results.push @create doc
-        else
-          results = @create docs[0]
+        results = @constructor.createModels docs
         callback err, results
 
   update : (newObj , opts = {},callback) ->
@@ -47,12 +51,7 @@ module.exports = class Model
     @collection().find(data, opts).toArray (err, docs)=>
       throw err if err
       if callback
-        results = []
-        if docs.length is 1
-          results = @create docs[0]
-        else
-          for doc in docs
-            results.push @create doc
+        results = @constructor.createModels docs
         callback err, results
 
   @findById: (id, callback) ->