Cascading Dropdown

<div id="app" class="ui grid">
  <div class="row">
    <div class="column">
      <div class="ui label">Vechicle Make</div>
      <select class="ui dropdown" v-model="make" id="vehicle-makes">
        <option v-for="option in makes_options" v-bind:value="option.id">
          {{ option.text }}
        </option>
      </select>
    </div>
  </div>
  <div class="row">
    <div class="column">
      <div class="ui label">Vechicle Model</div>
      <select class="ui dropdown" id="vehicle-models" v-model="model">
        <option 
          v-for="option in model_options[make]" 
          :value="option.id" 
          :key="option.id"
        >
          {{ option.text }}
        </option>
      </select>
    </div>
  </div>
</div>

<script>
var model_options = {
  1: [{ text: "Accord", id: 1 }, { text: "Civic", id: 2 }],
  2: [{ text: "Corolla", id: 3 }, { text: "Hi Ace", id: 4 }],
  3: [{ text: "Altima", id: 5 }, { text: "Zuke", id: 6 }],
  4: [{ text: "Alto", id: 7 }, { text: "Swift", id: 8 }]
};

var makes_options = [
  { text: "Honda", id: 1 },
  { text: "Toyota", id: 2 },
  { text: "Nissan", id: 3 },
  { text: "Suzuki", id: 4 }
];

var vm_makes = new Vue({
  el: "#app",
  data: {
    make: null,
    model: null,
    makes_options: makes_options,
    model_options: model_options,
  },
  watch: {
    make: function(event) {
      $('#vehicle-models').dropdown('clear');
    }
  }
});

// Eveything works fine if I remove this...
$('.ui.dropdown').dropdown();
</script>