I want to assign a constant in an array to a variable and after changing this variable, the constant is updated with the new value of the variable.   
But I cant understand what I must computed or watch.  

Its example what I want  

PageA.vue

```
 <div id="page-a">
      <div  class="card" 
            v-for="door in doors"
            :key="door.id">

        <div class="modelName">{{door.model}}</div>
      </div>
    </div>

    <script>
      export default {
        data() {
          return {
            firstDoorModel:"018",
            secondDoorModel:"015",
            doors: [    
             {model:firstDoorModel,
              id:"1"},
             {model:secondDoorModel,
              id:"2"},
             {model:firstDoorModel
              id:"3"}]
          }
        },
        methods: {
          changeModel(){
            this.firstDoorModel="012"
            this.secondDoorModel="010"
          }
        }

```