Edit in JSFiddle

<div id="app">
  <select v-model='currentOrder' >
                    <option v-for="(order, key) in orders" v-bind:key="key" v-bind:value="order.ID">{{order.NAME}}</option>
                </select>
                
  {{currentOrder}}
</div>
body {
  background: #20262E;
  padding: 20px;
  font-family: Helvetica;
}

#app {
  background: #fff;
  border-radius: 4px;
  padding: 20px;
  transition: all 0.2s;
}

li {
  margin: 8px 0;
}

h2 {
  font-weight: bold;
  margin-bottom: 15px;
}

del {
  color: rgba(0, 0, 0, 0.3);
}
var returnApp = new Vue({
    el: '#app',
    data: function(){
      return{
        orders: [
        	{ ID: 0, NAME: "Order 0" },
          { ID: 1, NAME: "Order 1" }
        ],
        allErrorArray: [],
        currentOrder: null,
      }
    }
  });