fix(scope): symbol operators are ignored (#8863)

lib/model.js

@@ -1401,7 +1401,7 @@ class Model {
       if (scope) {
       if (scope) {
         _.assignWith(self._scope, scope, (objectValue, sourceValue, key) => {
         _.assignWith(self._scope, scope, (objectValue, sourceValue, key) => {
           if (key === 'where') {
           if (key === 'where') {
-            return Array.isArray(sourceValue) ? sourceValue : _.assign(objectValue || {}, sourceValue);
+            return Array.isArray(sourceValue) ? sourceValue : Object.assign(objectValue || {}, sourceValue);
           } else if (['attributes', 'include', 'group'].indexOf(key) >= 0 && Array.isArray(objectValue) && Array.isArray(sourceValue)) {
           } else if (['attributes', 'include', 'group'].indexOf(key) >= 0 && Array.isArray(objectValue) && Array.isArray(sourceValue)) {
             return objectValue.concat(sourceValue);
             return objectValue.concat(sourceValue);
           }
           }

test/integration/model/scope.test.js

@@ -25,6 +25,14 @@ describe(Support.getTestDialectTeaser('Model'), () => {
           },
           },
           withName: {
           withName: {
             attributes: ['username']
             attributes: ['username']
+          },
+          highAccess: {
+            where: {
+              [Sequelize.Op.or]: [
+                { access_level: { [Sequelize.Op.gte]: 5 } },
+                { access_level: { [Sequelize.Op.eq]: 10 } }
+              ]
+            }
           }
           }
         }
         }
       });
       });
@@ -48,5 +56,12 @@ describe(Support.getTestDialectTeaser('Model'), () => {
           expect(record.access_level).to.exist;
           expect(record.access_level).to.exist;
         });
         });
     });
     });
+
+    it('should work with Symbol operators', function() {
+      return this.ScopeMe.scope('highAccess').findOne()
+        .then(record => {
+          expect(record.username).to.equal('tobi');
+        });
+    });
   });
   });
 });
 });