isUnique rule for collection on Vuelidate Next

Hey Guys! I researched all issues and don’t understand how i can implement my rule isUnique for collection. Could you help me? Please 😦

I also looked at https://github.com/vuelidate/vuelidate/issues/781

So, for Vuelidate first version i had this solution

validations() {
  return {
    collection: {
      $each: {
        title: {
          isUnique: isUnique(this.collection, 'title')
        }
      }
    }
  };
},

and helper

export default function isUnique(group, key) {
  return (value) => {
    const found = group.filter(item => {
      if (key) {
        return item[key] === value;
      }
      return item === value;
    });

    return found.length <= 1;
  };
}

How i can migrate my solution for Vuelidate next?

[dobromir-hristov]

Create a simple repro in codesandbox and we can try to help

[yuri-kovalev]

This is very inconvenient for me, use another component for each object 😦