<div v-for="company in form.company_ids" :key="company.key">
<v-text-field
v-model="company.id"
></v-text-field>
</div>data: () => ({
form: new Form({
email: '',
password: '',
role: '',
company_ids: [{key: 1}]
})
}),addCompany() {
this.form.company_ids.push({key: this.form.company_ids.length + 1});
}