use a group field for useAsTitle

[Teelon]

Can I use a group field for the useAsTitle on a collection admin property?. As of now it takes String? which indicates the field name that you want to use.
{ name:'name', type:'group', fields:[ { name:'first', type :'text' }, { name:'last', type:'text' } ] }

[JarrodMFlesch]

To be clear, you are wanting to use first as the document title?

No that is not currently possible. What you could do instead is create a top level field i.e. fullName and use a field hook to update that based on name.first and name.last.

Something like this:

{
  slug: 'example-collection',
  admin: {
    useAsTitle: 'fullName',
  },
  fields: [
    {
      admin: {
        hidden: true,
      },
      name: 'fullName',
      type: 'text',
      hooks: {
        beforeChange: [
          ({ siblingData, operation, value }) => {
            if (operation === 'create' || operation === 'update') {
              return `${siblingData.name.first} ${siblingData.name.last}`
            }
            return value
          },
        ],
      },
    },
    {
      name: 'name',
      type: 'group',
      fields: [
        {
          name: 'first',
          type: 'text',
        },
        {
          name: 'last',
          type: 'text',
        },
      ],
    },
  ],
},