Sanity array field with custom object type reference

Your schema looks good! This defines an array field named contacts that will hold multiple items of type contact_person.

Here's what your schema does:

• name: 'contacts' - the field identifier used in queries and code
• title: 'Contacts' - the human-readable label shown in Sanity Studio
• type: 'array' - makes this an orderable collection
• of: [{ type: 'contact_person' }] - specifies that array items must be of type contact_person

The array field will automatically give you drag-and-drop reordering, and each item will get a unique _key property that Sanity uses to track items. You'll also get copy/paste functionality for free, letting editors copy individual contacts or entire arrays between documents.

Make sure you have a contact_person schema type defined elsewhere in your schema files. It could be either a document type or an object type, depending on whether you want contacts to be standalone documents (referenced) or embedded objects:

// As an embedded object (inline)
{
  name: 'contact_person',
  type: 'object',
  fields: [
    { name: 'name', type: 'string' },
    { name: 'email', type: 'string' },
    // ... other fields
  ]
}

// Or as a reference to a document
{
  name: 'contacts',
  type: 'array',
  of: [
    { 
      type: 'reference',
      to: [{ type: 'contact_person' }]
    }
  ]
}

If you're getting a validation error about invalid "of" property, double-check that contact_person is properly defined and exported in your schema.