vue nextTick方法中的vue $ refs数组为空

Question

我有一个带有ref属性的v-for

<Car v-for="(car, index) in allCars" :key="car['id']" ref="allCars"
             @save="save(car['id'])" @remove="remove(car['id'])" />
<b-btn @click="addCar">Add Car</b-btn>

在我的addCar方法中，我想获取最新添加的汽车Vue组件

 addCAr() {
  this.allCars.push({id: null, name: null, color: null})
  console.log(this.$refs.allCars) // at this point it only has the initall components, without the latest addition. 
   Vue.nextTick(() => { 
     console.log(this.$refs.allCars) // here it has an empty array
   }

如何引用已添加的最新vue组件？