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Convert String to Object for the Slug Type

2 replies
Last updated: May 10, 2022
Hello, can’t seem to find any related issue on the web so I’m going to ask here. I wanted to know if there’s a way to convert the string to object for the slug type? Currently I have an old sanity data that using string as slug, and wanted to convert the type to slug for better schema. Somehow I have to regenerate all my data which are too many now.
May 9, 2022, 2:06 PM
Hey there! You can use mutations to batch edit any slug fiend you have defined. I'll usually create a script that handles it. Something like this should get you started:
import { studioClient } from './studioClient';
import cq from 'concurrent-queue';

// Create a queue to limit the rate at which you write changes to Sanity
let queue = cq()
  .limit({ concurrency: 2 })
  .process((task) => {
    return new Promise(function (resolve, reject) {
      setTimeout(resolve.bind(undefined, task), 1000);

const mutateDocs = async () => {
  //Fetch the documents you need to mutate
  const query = `*[defined(slug)]`;
  const docs = await studioClient.fetch(query);
  // Loop through all of the docs returned from our query
  for (const doc of docs) {
    queue(doc).then(async () => {
      // Add a message to help us know the upload is happening
      console.log(`Mutating ${doc._id}`);
      // Tell the client to patch the current document
        // Set the field
          slug: {
            _type: 'slug',
            current: doc.slug
        .then((updatedDoc) =>
          console.log(`Hurray, the doc is updated! New document:`, updatedDoc)
        .catch((err) =>
          console.error('Oh no, the update failed: ', err.message)

You'll need to install
and replace the
with a client you configure. Then you'll run it using
sanity exec <path-to-script> --withUserToken
May 9, 2022, 5:22 PM
Hello thanks this works perfectly though I had to change the
import { studioClient } from './studioClient';
import client from 'part:@sanity/base/client';
May 10, 2022, 9:33 AM

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