Can you use multiple fields as sources when generating a slug in Sanity?

Yes, absolutely! You can use multiple fields as a source when generating a slug. Instead of passing a simple string to the source option, you can use a function that receives the document and returns a combined string.

Here's how to do it:

{
  name: 'slug',
  type: 'slug',
  options: {
    source: (doc) => `${doc.title} ${doc.date}`,
    maxLength: 96
  }
}

The source option accepts a function that receives the entire document as an argument, allowing you to access and combine any fields you need. The function should return a string that will be slugified when you click the "Generate" button in the Studio.

You can get creative with this - for example, you might want to combine a category with a title:

source: (doc) => `${doc.category} ${doc.title}`

Or format a date along with the title:

source: (doc) => {
  const date = new Date(doc.publishedAt).toISOString().split('T')[0];
  return `${date} ${doc.title}`;
}

The function gives you full flexibility to construct the source string however you need before it gets converted into a URL-friendly slug. Just remember that the actual slugification (converting to lowercase, replacing spaces with hyphens, etc.) happens automatically after your function returns the combined string.