From 35905ffebe99f4b2873aef7ad718458f10a9e526 Mon Sep 17 00:00:00 2001
From: Jinjiang <zhaojinjiang@me.com>
Date: Tue, 26 Apr 2016 12:19:51 +0800
Subject: [PATCH 1/2] fixed Vue.delete(vm, key) bug

---
 src/util/lang.js                          |  4 ++++
 test/unit/specs/observer/observer_spec.js | 19 +++++++++++++++++++
 2 files changed, 23 insertions(+)

diff --git a/src/util/lang.js b/src/util/lang.js
index e53e9869434..29e450fa5a2 100644
--- a/src/util/lang.js
+++ b/src/util/lang.js
@@ -50,6 +50,10 @@ export function del (obj, key) {
   delete obj[key]
   var ob = obj.__ob__
   if (!ob) {
+    if (obj._isVue) {
+      delete obj._data[key]
+      obj._digest()
+    }
     return
   }
   ob.dep.notify()
diff --git a/test/unit/specs/observer/observer_spec.js b/test/unit/specs/observer/observer_spec.js
index b4ed2f9b6fb..2a2eab06eea 100644
--- a/test/unit/specs/observer/observer_spec.js
+++ b/test/unit/specs/observer/observer_spec.js
@@ -286,6 +286,25 @@ describe('Observer', function () {
     expect(dep3.notify.calls.count()).toBe(2)
   })
 
+  it('observing set/delete in Vm object', function (done) {
+    var el = document.createElement('div')
+    var vm = new Vue({
+      el: el,
+      template: '<div>{{a}}</div>',
+      data: { a: 1 }
+    })
+    expect(el.innerHTML).toBe('<div>1</div>')
+    Vue.set(vm, 'a', 2)
+    Vue.nextTick(() => {
+      expect(el.innerHTML).toBe('<div>2</div>')
+      Vue.delete(vm, 'a')
+      Vue.nextTick(() => {
+        expect(el.innerHTML).toBe('<div></div>')
+        done()
+      })
+    })
+  })
+
   it('observing array mutation', function () {
     var arr = []
     var ob = observe(arr)

From 62b5b9bbfacd7315466f74d989fc22f424ada3d4 Mon Sep 17 00:00:00 2001
From: Jinjiang <zhaojinjiang@me.com>
Date: Tue, 26 Apr 2016 12:49:34 +0800
Subject: [PATCH 2/2] rollback to es5 syntax in test case

---
 test/unit/specs/observer/observer_spec.js | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/test/unit/specs/observer/observer_spec.js b/test/unit/specs/observer/observer_spec.js
index 2a2eab06eea..ea9ade50aae 100644
--- a/test/unit/specs/observer/observer_spec.js
+++ b/test/unit/specs/observer/observer_spec.js
@@ -295,10 +295,10 @@ describe('Observer', function () {
     })
     expect(el.innerHTML).toBe('<div>1</div>')
     Vue.set(vm, 'a', 2)
-    Vue.nextTick(() => {
+    Vue.nextTick(function () {
       expect(el.innerHTML).toBe('<div>2</div>')
       Vue.delete(vm, 'a')
-      Vue.nextTick(() => {
+      Vue.nextTick(function () {
         expect(el.innerHTML).toBe('<div></div>')
         done()
       })