handle v-repeat switching between object & array (fix vuejs#869)

Author: yyx990803

src/directives/repeat.js

@@ -522,8 +522,9 @@ module.exports = {
   uncacheVm: function (vm) {
     var data = vm._raw
     var idKey = this.idKey
-    if (idKey || this.converted) {
-      var id = idKey ? data[idKey] : vm.$key
+    var convertedKey = vm.$key
+    if (idKey || convertedKey) {
+      var id = idKey ? data[idKey] : convertedKey
       this.cache[id] = null
     } else if (isObject(data)) {
       data[this.id] = null
@@ -573,6 +574,7 @@ function objToArray (obj) {
   // regardless of type, store the un-filtered raw value.
   this.rawValue = obj
   if (!isPlainObject(obj)) {
+    this.converted = false
     return obj
   }
   var keys = Object.keys(obj)

test/unit/specs/directives/repeat_spec.js

@@ -670,6 +670,32 @@ if (_.inBrowser) {
       }
     })
 
+    it('switch between object-converted & array mode', function (done) {
+      var obj = {
+        a: { msg: 'AA' },
+        b: { msg: 'BB' }
+      }
+      var arr = [obj.b, obj.a]
+      var vm = new Vue({
+        el: el,
+        template: '<div v-repeat="obj">{{msg}}</div>',
+        data: {
+          obj: obj
+        }
+      })
+      expect(el.innerHTML).toBe(Object.keys(obj).map(function (key) {
+        return '<div>' + obj[key].msg + '</div>'
+      }).join(''))
+      vm.obj = arr
+      _.nextTick(function () {
+        expect(el.innerHTML).toBe('<div>BB</div><div>AA</div>')
+        // make sure it cleared the cache
+        expect(vm._directives[0].cache.a).toBeNull()
+        expect(vm._directives[0].cache.b).toBeNull()
+        done()
+      })
+    })
+
   })
 }