Looking to dynamically add validation to a mapped array but I’m having trouble in the validation process wit getting the day of the week when the isOpen boolean is true or not so that the following string types openingHours and closingHours will be set to required.

businessHours.tsx

import {defineField, defineType} from 'sanity'

const weekDays = ['Monday', 'Tuesday', 'Wednesday', 'Thursday', 'Friday', 'Saturday', 'Sunday'].map(
  day =>
    defineField({
      name: day.toLowerCase(),
      title: day,
      type: 'hours',
      initialValue: {
        day,
      },
    }),
)

export default defineType({
  name: 'businessHours',
  title: 'Business Hours',
  type: 'object',
  fields: weekDays,
})

hours.tsx

import {defineField, defineType} from 'sanity'

export default defineType({
  name: 'hours',
  title: 'Open Hours',
  type: 'object',
  options: {
    collapsed: false,
    collapsible: true,
  },
  fields: [
    defineField({
      name: 'isOpen',
      title: 'Is Open',
      type: 'boolean',
    }),
    defineField({
      name: 'openingHours',
      title: 'Opening Hours',
      type: 'string',
      validation: Rule =>
        Rule.custom((_, {document}) => {
          console.log(document)
          return document?.isOpen === true ? 'Required' : false
        }),
    }),
    defineField({
      name: 'closingHours',
      title: 'Closing Hours',
      type: 'string',
      validation: Rule =>
        Rule.custom((_, {document}) => {
          console.log(document)
          return document?.isOpen === true ? 'Required' : false
        }),
    }),
  ],
})

I get an object log of:

{
    "_type": "businessHours",
    "monday": {
        "_type": "hours",
        "isOpen": true
    },
    "sunday": {
        "_type": "hours",
        "isOpen": true
    }
}

In Sanity 3 how can I get dynamically get isOpen on the day of the week?