Fix(#4856) : Fixed scope attributes are not merging issue, added tests and changelog

changelog.md

 # Future
 # Future
+- [FIXED] attributes from multiple scopes does not merge  [#4856](https://github.com/sequelize/sequelize/issues/4856)
 - [FIXED] Support Unicode strings in mssql [#3752](https://github.com/sequelize/sequelize/issues/3752)
 - [FIXED] Support Unicode strings in mssql [#3752](https://github.com/sequelize/sequelize/issues/3752)
 
 
 # 3.15.1
 # 3.15.1

lib/model.js

@@ -1193,7 +1193,7 @@ Model.prototype.scope = function(option) {
       _.assign(self.$scope, scope, function scopeCustomizer(objectValue, sourceValue, key) {
       _.assign(self.$scope, scope, function scopeCustomizer(objectValue, sourceValue, key) {
         if (key === 'where') {
         if (key === 'where') {
           return Array.isArray(sourceValue) ? sourceValue : _.assign(objectValue || {}, sourceValue);
           return Array.isArray(sourceValue) ? sourceValue : _.assign(objectValue || {}, sourceValue);
-        } else if (key === 'include' && Array.isArray(objectValue) && Array.isArray(sourceValue)) {
+        } else if ( (['attributes','include'].indexOf(key) >= 0) && Array.isArray(objectValue) && Array.isArray(sourceValue)) {
           return objectValue.concat(sourceValue);
           return objectValue.concat(sourceValue);
         }
         }
 
 

test/integration/model/scope.test.js

+'use strict';
+
+/* jshint -W030 */
+/* jshint -W110 */
+var chai = require('chai')
+  , Sequelize = require('../../../index')
+  , expect = chai.expect
+  , Support = require(__dirname + '/../support');
+
+describe(Support.getTestDialectTeaser('Model'), function() {
+  describe('scope', function () {
+    beforeEach(function () {
+      this.ScopeMe = this.sequelize.define('ScopeMe', {
+        username: Sequelize.STRING,
+        email: Sequelize.STRING,
+        access_level: Sequelize.INTEGER,
+        other_value: Sequelize.INTEGER
+      }, {
+         scopes: {
+           lowAccess: {
+             attributes: ['other_value', 'access_level'],
+             where: {
+               access_level: {
+                 lte: 5
+               }
+             }
+           },
+           withName: {
+             attributes: ['username']
+           }
+         }
+      });
+
+      return this.sequelize.sync({force: true}).then(function() {
+        var records = [
+          {username: 'tony', email: 'tony@sequelizejs.com', access_level: 3, other_value: 7},
+          {username: 'tobi', email: 'tobi@fakeemail.com', access_level: 10, other_value: 11},
+          {username: 'dan', email: 'dan@sequelizejs.com', access_level: 5, other_value: 10},
+          {username: 'fred', email: 'fred@foobar.com', access_level: 3, other_value: 7}
+        ];
+        return this.ScopeMe.bulkCreate(records);
+      }.bind(this));
+    });
+
+    it('should be able to merge attributes as array', function () {
+      return this.ScopeMe.scope('lowAccess','withName').findOne()
+              .then(function(record){
+                expect(record.other_value).to.exist;
+                expect(record.username).to.exist;
+                expect(record.access_level).to.exist;
+              });
+    });
+  });
+});