Input.vue

<template>
    <div class="setup-form">
        <b-form-group description="The title of your page" label="Page Title" label-for="title">
            <b-form-input id="title" v-model.trim="title"></b-form-input>
        </b-form-group>
        <div class="mt-5">
            <b-button variant="primary" :block="true" @click="onUpdate">Update</b-button>
        </div>
    </div>
</template>
<script>
export default {
    data () {
        return {
            _title: ''
        }
    },
    methods: {
        onUpdate () {
            console.log(this._title);  // dispatch action to push title back to API here
        }
    },
    computed: {
        title: {
            get () {
                if (this._title) {
                    return this._title;
                }
                return this.$store.getters.title
            },
            set (value) {
                this._title = value;
            }
        }
    },
    name: 'setup-tab-form'
}
</script>