Reference options must be an object

Sanity Studio reports that a reference type expects `options` to be an object when the `options` key on a reference is set to anything other than a plain object.

The reference field lets you define options for the input component. Define these options under the options key, and set its value to an object.

Sanity Studio reports The reference type expects `options` to be an object when a reference type has an options key whose value is not a plain object. The error fires whenever options is set to anything other than a plain object, and only then. An array, a string, a number, and a boolean all trigger it.

import {defineField, defineType} from 'sanity'

export default defineType({
  name: 'blogPost',
  type: 'document',
  fields: [
    defineField({
      name: 'author',
      type: 'reference',
      to: [{type: 'person'}],
      // Fails validation: `options` is an array, not an object
      options: [{filter: 'age > 30'}],
    }),
  ],
})

import {defineField, defineType} from 'sanity'

export default defineType({
  name: 'blogPost',
  type: 'document',
  fields: [
    defineField({
      name: 'author',
      type: 'reference',
      to: [{type: 'person'}],
      options: {filter: 'age > 30'},
    }),
  ],
})

A reference accepts filter, filterParams, disableNew, and creationTypeFilter as options. Note that weak is a top-level property on the reference definition, not an option. See Reference type for the full list.

• Reference field options must be nested under the options key: for when filter or filterParams sits on the root of the type instead of inside options.
• Incompatible combination of params and filter: for when filterParams is combined with a filter function.