Including Redirects in a Sanity Schema

export default {
  name: 'yourDocument',
  title: 'Your Document',
  type: 'document',
  initialValue: {
    redirect: {
      _type: 'reference',
      _ref: <_id-of-redirect-document>
    }
  }
  //...
}

import React, { useState, useEffect } from 'react';
import { withDocument } from 'part:@sanity/form-builder';
import { FormField } from '@sanity/base/components';
import client from 'part:@sanity/base/client';

const studioClient = client.withConfig({ apiVersion: '2021-10-21' });

const Redirects = React.forwardRef((props, ref) => {
  const [redirects, setRedirects] = useState([]);

  const {
    type, // Schema information
    value, // Current field value
    readOnly, // Boolean if field is not editable
    markers, // Markers including validation rules
    presence, // Presence information for collaborative avatars
    compareValue, // Value to check for "edited" functionality
    onFocus, // Method to handle focus state
    onBlur, // Method to handle blur state
    onChange, // Method to handle patch events,
    parent,
    document,
  } = props;

  // Creates a change handler for patching data

  const inputId = useId();

  useEffect(() => {
    const getRedirects = async () => {
      if (!document._id) return;
      await studioClient
        .fetch(`*[_type =='redirect' && references($id)]`, { id: document._id })
        .then(setRedirects);
    };

    getRedirects();
  }, [document._id]);

  return (
    <FormField
      description={type.description} // Creates description from schema
      title={type.title} // Creates label from schema title
      __unstable_markers={markers} // Handles all markers including validation
      __unstable_presence={presence} // Handles presence avatars
      compareValue={compareValue} // Handles "edited" status
      inputId={inputId} // Allows the label to connect to the input field
    >
      {redirects && redirects.map(redirect => <p>{redirect.title}</p>)}
    </FormField>
  );
});

export default withDocument(Redirects);