sample.js

<script>
    import Form from '../../../libraries/form.js';

    export default {
        created() {
            if ( !Object.keys(this.$store.getters.businesses).length ) 
                this.$store.dispatch('getBusinesses')
        },
        data() {
            return {
                disableButtons: false
            }
        },
        methods: {
            onSubmit() {
                this.disableButtons = true;

                let action = this.expense ? 'updateExpense' : 'createExpense';
                let current = this.expense ? this.expense.id : null;

                this.$store.dispatch(action, {'data': this.form.data(), 'expenseID': current})
                    .then(response => {
                        this.form.onSuccess(response.data);

                        this.disableButtons = false;

                        var destination = this.expense ? response.data.expense.url : '/expenses';
                        this.$router.push(destination);
                    })
                    .catch(error => {
                        this.form.onFail(error.response.data);
                        
                        this.disableButtons = false;
                    });
            }
        },
        computed: {
            form() {
                if (this.expense = this.$store.getters.currentExpense){
                    return new Form(this.expense);
                }
                
                return new Form({
                    'business_id': '',
                    'title': '',
                    'description': '',
                    'amount': '',
                    'date': '',
                    'location': '',
                    'currency_id': '1'
                });
            }
        }
    }
</script>