Vuelidate v0.75 collections validation seems to work fine if the array or collection is objects. If the collection/array is native types (e.g. String), the changes/reactivity is not detected (not trigerring valiation rules, but the underlying value did indeed changed).
<template> <div> <b-form ref="form" @submit.prevent="submit"> <b-form-group label="Name" label-for="input-name" invalid-feedback="Name is required" > <b-form-input :state="validateState($v.item.name)" id="input-name" v-model="$v.item.name.$model" ></b-form-input> </b-form-group> <!-- <div v-for="(v, index) in $v.friends.$each.$iter"> --> <b-row v-for="item, index in friends" :key="index"> <b-col md="6"> <b-form-input :state="validateState($v.friends.$each[index].name)" v-model="$v.friends.$each[index].name.$model"> </b-form-input> </b-col> <b-col md="6"> <b-form-input :state="validateState($v.friends.$each[index].age)" v-model="$v.friends.$each[index].age.$model"> </b-form-input> </b-col> </b-row> <b-button type="submit" variant="primary">Submit</b-button> </b-form> </div></template><script>import { validationMixin } from "vuelidate"import { required, minLength } from "vuelidate/lib/validators"export default { mixins: [validationMixin], // props: ['item'], data() { item: { name: 'Desmond', friends: [ { name: 'Elon', age: 48 }, { name: 'Jack', age: 43 }, { name: 'Mei Ru', age: 40 } ] }, }, validations: { item: { name: { required }, friends: { $each: { name: { required }, age: { required } } }, } }, methods: { validateState(item) { const { $dirty, $error } = item return $dirty ? !$error : null }, submit() { this.$v.item.$touch() if (this.$v.item.$anyError) return false console.log(this.item) alert("Form submitted!") } }}</script>