@seidhr/sanity-plugin-muna-schemas/src/schemas/properties/datatype/preferredIdentifier.js

Muna or ᛗᚢᚾᚨ means remember in norse. Muna is a schema for the Sanity Studio that enables detailed descriptions of cultural heritage objects and knowledge about their contexts as well as pages about them (or anything else really.)

import React from 'react';
import { BsFillQuestionCircleFill } from 'react-icons/bs';
import { Link } from 'part:@sanity/base/router';
import sanityClient from 'part:@sanity/base/client'

const client = sanityClient.withConfig({ apiVersion: '2021-03-25', useCdn: false })

export const preferredIdentifier = {
  name: 'preferredIdentifier',
  title: 'Foretrukket identifikator',
  titleEN: 'Preferred identifier',
  description: (
    <span>
      Identifikatoren som er gjeldende for dette objektet. Alternative, eksterne eller ugyldige
      identifikatorer kan registreres i <i>Identifiert av </i>.{' '}
      <Link
        target="blank"
        href={'https://muna.xyz/docs/model/properties#preferred-identifier'}
      >
        <BsFillQuestionCircleFill />
      </Link>
    </span>
  ),
  descriptionEN: (
    <span>
      Current, valid identifier for this object. Alternative, external or invalid ifentifiers can be
      add to <i>identified by</i>.{' '}
      <Link
        target="blank"
        href={'https://muna.xyz/docs/model/properties#preferred-identifier'}
      >
        <BsFillQuestionCircleFill />
      </Link>
    </span>
  ),
  type: 'string',
  validation: (Rule) => Rule.required().custom(async (prefId) => {
    const docs = await client.fetch(
      `*[preferredIdentifier == "${prefId}" && !(_id in path("drafts.**"))] { preferredIdentifier }`,
      { prefId }
    );
    return docs.length > 1 ? 'Value is not unique' : true;
  }),
};