binding model to QSelect with checkbox

[mfrz6]

im wanna to bind model to QSelect with checkbox,
but when binding model to QSelect checkbox not checked.
this is my code:

 data() {
    return {
        selectModel: [],
        selectOptions: [
        {
          label: 'Google',
          value: 1
        },
        {
          label: 'Facebook',
          value: 2
        },
        {
          label: 'Twitter',
          value: 3
        },
        {
          label: 'Apple',
          value: 4
        },
        {
          label: 'Oracle',
          value: 5
        }
      ],
     
    };
  },

and button event to binding QSelect

    onBindCheckedSelect() {
this.selectModel= [
 {
          label: 'Twitter',
          value: 3
        },
        {
          label: 'Apple',
          value: 4,
          
        },

    ]},

and this is my html code

 <div class="q-pa-md" style="max-width: 300px">
    <div class="q-gutter-md">
      <q-badge color="secondary" multi-line>
        Model: "{{ model }}"
      </q-badge>

      <q-select
          filled
          v-model="selectModel"
          :options="selectOptions"
          label="Multi with toggle"
          multiple
          emit-value
          map-options
      >
        <template v-slot:option="scope">
          <q-item
            v-bind="scope.itemProps"
            v-on="scope.itemEvents"
          >
            <q-item-section>
              <q-item-label v-html="scope.opt.label" ></q-item-label>
            </q-item-section>
            <q-item-section side>
              <q-checkbox v-model="selectModel" :val="scope.opt.value" />
            </q-item-section>
          </q-item>
        </template>
      </q-select>
    </div>
  </div>

but its not working and selected item not checked

[dobbel]

@mfrz6

Please create a codepen( very simple to do by extending a Quasar Doc example) to demo your problem so the people here can help you better.

btw: I don’t think it’s a good idea to use both v-model and :val on the same component

<q-checkbox v-model="selectModel" :val="scope.opt.value" />